tire type FORD FIESTA 1989 Service Repair Manual

V-belt and flat “polyvee” type
drivebelt with rack-and-pinion type
adjuster
12Loosen off the alternator mounting bolts
and the adjusting arm mounting bolt. Slacken
the pinion central locking bolt, and turn the
pinion nut as required to take up the tension
of the drivebelt. Hold it at the required setting,
and tighten the central bolt securely to lock
the adjuster arm and set the tension (see
illustrations) .
13 Tighten the alternator mounting and
adjusting arm bolts securely.
14 Refit the auxiliary drivebelt cover (where
applicable) and roadwheel, then lower the
vehicle to the ground.
15 Run the engine for about five minutes,
then recheck the tension.
Flat “polyvee” type drivebelt with
tensioner pulley adjuster (HCS engine
power steering pump drivebelt)
16 Slacken the tensioner pulley centre bolt
then turn the adjuster bolt at the base of the
tensioner pulley bracket, as required, to take
up the tension of the drivebelt. When the belt
deflection is correct, tighten the adjuster
pulley centre retaining bolt.
17 Refit the auxiliary drivebelt cover (where
applicable) and roadwheel, then lower the
vehicle to the ground.
18 Run the engine for about five minutes,
then recheck the tension.
Flat “polyvee” type drivebelt with
automatic adjuster
19 As mentioned above, this type of drivebelt
is tensioned by an automatic tensioner;
regular checks are not required, and manual
“adjustment” is not possible.
20 If you suspect that the drivebelt is slipping
and/or running slack, or that the tensioner is
otherwise faulty, it must be renewed. To do
this, remove the drivebelt as described below,
then unbolt and remove the tensioner. On
fitting the new tensioner, ensure that it is
aligned correctly on its mountings, and
tightened to the specified torque wrench
setting.
Renewal
21 Open the bonnet. Jack up the front right-
hand side of the vehicle, and support it
securely on an axle stand. Remove the
roadwheel, then remove the auxiliary drivebelt
lower cover (where fitted) from inside the
wheel arch.
22 The routing of the drivebelt around the
pulleys is dependent on the drivebelt type,
and on whether power steering is fitted.
Before removing the drivebelt, it’s a good idea
to sketch the belt run around the pulleys; this
will save a lot of frustration when it comes to
refitting. Note that on HCS engines with
power steering, to renew the alternator/
water pump drivebelt it will be necessary to
remove the power steering pump drivebelt
first.
23 If the existing drivebelt is to be refitted,
mark it, or note the maker’s markings on its
flat surface, so that it can be installed the
same way round.
24 To renew a drivebelt with manual
adjustment, slacken the belt tension fully as
described above, according to type. Slip the
belt off the pulleys, then fit the new belt,
ensuring that it is routed correctly. If fitting a
flat “polyvee” type drivebelt, arrange it on the
grooved pulleys so that it is centred in
their grooves, and not overlapping their raised
sides. With the belt in position, adjust the
tension as previously described.
25 To renew the flat, “polyvee” type drivebelt
with automatic adjuster, reach up between
the body and the engine (above the
crankshaft pulley), and apply a spanner to the
hexagon in the centre of the automatic
tensioner’s pulley. Rotate the tensioner pulley
clockwise to release its pressure on the
drivebelt, then slip the drivebelt off the
crankshaft pulley, and release the tensioner
again (see illustration) . Note that on certain
models, a self-cocking tensioner is fitted, and
that this will remain in the released position.
Working from the wheel arch or engine
compartment as necessary, and noting its
routing, slip the drivebelt off the remaining
pulleys and withdraw it.
26 Check all the pulleys, ensuring that their
grooves are clean, and removing all traces of oil and grease. Check that the tensioner
works properly, with strong spring pressure
being felt when its pulley is rotated clockwise,
and a smooth return to the limit of its travel
when released.
27
If the original drivebelt is being refitted,
use the marks or notes made on removal, to
ensure that it is installed to run in the same
direction as it was previously. To fit the
drivebelt, arrange it on the grooved pulleys so
that it is centred in their grooves, and not
overlapping their raised sides, and is routed
correctly. Start at the top, and work down to
finish at the crankshaft pulley; rotate the
tensioner pulley clockwise, slip the drivebelt
onto the crankshaft pulley, then release the
tensioner again.
28 Using a spanner applied to the crankshaft
pulley bolt, rotate the crankshaft through at
least two full turns clockwise to settle the
drivebelt on the pulleys, then check that
the drivebelt is properly installed.
29 Refit the auxiliary drivebelt cover (where
applicable) and roadwheel, then lower the
vehicle to the ground.
5 Underbonnet check for fluid leaks and hose condition
1
General
1High temperatures in the engine
compartment can cause the deterioration of
the rubber and plastic hoses used for engine,
accessory and emissions systems operation.
Periodic inspection should be made for
cracks, loose clamps, material hardening and
leaks.
2 Carefully check the large top and bottom
radiator hoses, along with the other smaller-
diameter cooling system hoses and metal
pipes; do not forget the heater hoses/pipes
which run from the engine to the bulkhead.
Inspect each hose along its entire length,
replacing any that is cracked, swollen or
shows signs of deterioration. Cracks may
become more apparent if the hose is
1•12Every 10 000 miles or 12 months
4.25 Automatic drivebelt tensioner - “polyvee” type drivebelt
Turn tensioner clockwise to release tension4.12b When the tension is correct, hold
the adjuster nut, and tighten the central bolt securely to lock the adjuster arm4.12a Rack-and-pinion type auxiliary drivebelt adjuster
A Adjuster arm
B Pinion (adjuster) nut
C Central (locking) bolt
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squeezed (see illustration) . If you are using
non-Ford specification antifreeze, and so
have to renew the coolant every two years or
so, it’s a good idea to renew the hoses at that
time, regardless of their apparent condition.
3 Make sure that all hose connections are
tight. A leak in the cooling system will usually
show up as white- or rust-coloured deposits
on the areas adjoining the leak; if the spring
clamps that are used to secure the hoses in
this system appear to be slackening, they
should be renewed to prevent the possibility
of leaks.
4 Some other hoses are secured to their
fittings with clamps. Where clamps are used,
check to be sure they haven’t lost their
tension, allowing the hose to leak. If clamps
aren’t used, make sure the hose has not
expanded and/or hardened where it slips over
the fitting, allowing it to leak.
5 Check all fluid reservoirs, filler caps, drain
plugs and fittings etc, looking for any signs
of leakage of oil, transmission and/or brake
hydraulic fluid, coolant and power steering
fluid. If the vehicle is regularly parked in the
same place, close inspection of the ground
underneath it will soon show any leaks. As
soon as a leak is detected, its source must
be traced and rectified. Where oil has been
leaking for some time, it is usually necessary
to use a steam cleaner, pressure washer or
similar, to clean away the accumulated
dirt, so that (when the engine is run again)
the exact source of the leak can be
identified.
Vacuum hoses
6 It’s quite common for vacuum hoses,
especially those in the emissions system, to be
colour-coded, or to be identified by coloured stripes moulded into them. Various systems
require hoses with different wall thicknesses,
collapse resistance and temperature
resistance. When renewing hoses, be sure the
new ones are made of the same material.
7
Often the only effective way to check a
hose is to remove it completely from the
vehicle. If more than one hose is removed, be
sure to label the hoses and fittings to ensure
correct installation.
8 When checking vacuum hoses, be sure to
include any plastic T-fittings in the check.
Inspect the fittings for cracks, and check the
hose where it fits over the fitting for distortion,
which could cause leakage.
9 A small piece of vacuum hose (quarter-inch
inside diameter) can be used as a
stethoscope to detect vacuum leaks. Hold
one end of the hose to your ear, and probe
around vacuum hoses and fittings, listening
for the “hissing” sound characteristic of a
vacuum leak. Warning: When probing with the
vacuum-hose stethoscope, be
very careful not to come into
contact with moving engine
components such as the auxiliary
drivebelt, radiator electric cooling fan, etc.
Fuel hoses
Warning: There are certain
precautions which must be
taken when inspecting or
servicing fuel system
components. Work in a well-ventilated
area, and do not allow open flames
(cigarettes, appliance pilot lights, etc.) or
bare light bulbs near the work area. Mop
up any spills immediately, and do not store
fuel-soaked rags where they could ignite.
10 Check all fuel hoses for deterioration and
chafing. Check especially for cracks in areas
where the hose bends, and also just before
fittings, such as where a hose attaches to the
fuel filter.
11 High-quality fuel line, usually identified by
the word “Fluoroelastomer” printed on the
hose, should be used for fuel line renewal.
Never, under any circumstances, use
unreinforced vacuum line, clear plastic tubing
or water hose for fuel lines.
12 Spring- type clamps are commonly used
on fuel lines. These clamps often lose their
tension over a period of time, and can be
“sprung” during removal. Replace all
spring- type clamps with screw clamps
whenever a hose is replaced.
Metal lines
13 Sections of metal piping are often used
for fuel line between the fuel filter and the
engine. Check carefully to be sure the piping
has not been bent or crimped, and that cracks
have not started in the line.
14 If a section of metal fuel line must be
renewed, only seamless steel piping should
be used, since copper and aluminium piping
don’t have the strength necessary to
withstand normal engine vibration. 15
Check the metal brake lines where they
enter the master cylinder and ABS hydraulic
unit (if used) for cracks in the lines or loose
fittings. Any sign of brake fluid leakage calls
for an immediate and thorough inspection of
the brake system.
6 Engine compartment wiring check
1
1With the vehicle parked on level ground,
apply the handbrake firmly and open the
bonnet. Using an inspection light or a small
electric torch, check all visible wiring within
and beneath the engine compartment.
2 What you are looking for is wiring that is
obviously damaged by chafing against sharp
edges, or against moving suspension/
transmission components and/or the auxiliary
drivebelt, by being trapped or crushed
between carelessly-refitted components, or
melted by being forced into contact with the
hot engine castings, coolant pipes, etc. In
almost all cases, damage of this sort is
caused in the first instance by incorrect
routing on reassembly, after previous work
has been carried out.
3 Depending on the extent of the problem,
damaged wiring may be repaired by rejoining
the break or splicing-in a new length of wire,
using solder to ensure a good connection,
and remaking the insulation with adhesive
insulating tape or heat-shrink tubing, as
appropriate. If the damage is extensive, given
the implications for the vehicle’s future
reliability, the best long-term answer may well
be to renew that entire section of the loom,
however expensive this may appear.
4 When the actual damage has been
repaired, ensure that the wiring loom is re-
routed correctly, so that it is clear of other
components, and not stretched or kinked, and
is secured out of harm’s way using the plastic
clips, guides and ties provided.
5 Check all electrical connectors, ensuring
that they are clean, securely fastened, and
that each is locked by its plastic tabs or wire
clip, as appropriate. If any connector shows
external signs of corrosion (accumulations of
white or green deposits, or streaks of “rust”),
or if any is thought to be dirty, it must be
unplugged and cleaned using electrical
contact cleaner. If the connector pins are
severely corroded, the connector must be
renewed; note that this may mean the renewal
of that entire section of the loom - see your
local Ford dealer for details.
6 If the cleaner completely removes the
corrosion to leave the connector in a
satisfactory condition, it would be wise to
pack the connector with a suitable material
which will exclude dirt and moisture,
preventing the corrosion from occurring
again; a Ford dealer may be able to
recommend a suitable product.
7 Check the condition of the battery
Every 10 000 miles or 12 months1•13
5.2 Hoses, like drivebelts, have a habit of
failing at the worst possible time - to
prevent the inconvenience of a blown radiator or heater hose, inspect them
carefully as shown here
1
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connections - remake the connections or
renew the leads if a fault is found. Use the
same techniques to ensure that all earth
points in the engine compartment provide
good electrical contact through clean, metal-
to-metal joints, and that all are securely
fastened. (In addition to the earth connection
at the engine lifting eye, and that from the
transmission to the body/battery, there are
others in various places, so check carefully).
8Refer to Section 21 for details of spark plug
(HT) lead checks.
7 Valve clearance adjustment
2
Refer to Chapter 2, Part A.
8 Manual transmission oil level check
1
1The manual transmission does not have a
dipstick. To check the oil level, raise the
vehicle and support it securely on axle stands,
making sure that the vehicle is level. On the
lower front side of the transmission housing,
you will see the filler/level plug. Unscrew and
remove it - an Allen key or bit will probably be
required (see illustration) .
2 With the plug removed, check the oil level.
To do this accurately, make up an oil level
check dipstick from a short length of welding
rod or similar material. Make a 90º bend in the
rod, then mark the downward leg in 5 mm
increments. The dipstick is then inserted
through the filler plug orifice so that the
unmarked leg rests flat on the plug orifice
threads, with the marked leg dipped in the oil.
Withdraw the dipstick and read off the level of
oil.
3 The oil level must be maintained between 0
and 5 mm below the lower edge of the
filler/level plug hole. Top up (if necessary),
using fresh transmission oil of the specified
type and using a syringe, or a plastic bottle
and tube. Refit and tighten the filler/level plug
to the specified torque on completion. 4
The need for regular topping-up can only
be due to a leak, which should be found and
rectified without delay.
5 Regular oil changing is not specified by the
manufacturer’s, but the oil can be drained, if
required, by removing the selector shaft cap
nut and locking assembly.
9 Idle speed and mixture check and adjustment
4
General
1Many of the engines fitted to Fiesta models
are equipped with fuel injection systems of
one sort or another which are entirely
controlled by the engine management system.
On most of these vehicles, it isn’t possible to
make any adjustments to the idle speed or the
mixture settings without specialist test
equipment of a type usually only found at a
Ford dealer or fuel injection specialist.
However, the very nature of these highly-
sophisticated systems means they don’t go
out of tune very often (if ever), so that it’s one
less maintenance operation to worry about.
2 On carburettor engines and 1.6 litre EFi fuel
injection engines, certain checks and
adjustments are necessary as part of the
service requirements, and these are described
below.
Idle speed and mixture check
and adjustment - carburettor
engines
Note: Later carburettors are fitted with
tamperproof mixture adjusting screws,
consisting of a hexagon-shaped socket with a
pin in the centre. Such screws require the use
of Ford service tool 23-032 to alter their
settings; if this tool (or a suitable equivalent) is
not available, the CO level will have to be
checked, and any necessary adjustment will
have to be made, by a Ford dealer.
3 Before carrying out the following checks
and adjustments, ensure that the spark plugs
are in good condition and correctly gapped
(Section 21). To carry out the checks/adjustments, an accurate tachometer
and an exhaust gas analyser (CO meter) will
be required.
4
Make sure that all electrical components
are switched off during the following
procedures.
5 Connect a tachometer to the engine in
accordance with its manufacturer’s
instructions, and insert the probe of an
exhaust gas analyser (CO meter) into the
exhaust tailpipe. As previously mentioned,
these items are essential in obtaining an
accurate setting. If they are not available, an
approximate check/adjustment can be made
as a temporary measure, providing they are
further checked out as soon as is possible
using a tachometer and a CO meter (or by a
Ford dealer).
6 Run the engine at a fast idle speed until it
reaches its normal operating temperature and
the radiator cooling fan cuts in. Turn the
engine off, then disconnect the radiator
cooling fan lead at the thermostatic switch
connector. Now connect a temporary wire to
the fan switch multi-plug, as shown (see
illustration) to enable the fan to operate
continuously during the following checks and
adjustments (if this is specified). Take care to
keep clear of the fan during the following
operations when working in the engine
compartment.
7 Where fitted, disconnect the throttle kicker
vacuum pipe, and plug the end. To identify
the throttle kicker unit, refer to Chapter 4A.
8 Check that the vehicle lighting and other
electrical loadings (apart from the radiator
cooling fan) are switched off, then restart the
engine. Increase the engine speed to 3000 rpm
for 30 seconds, and repeat this at three-minute
intervals during the check/adjustment
procedures. This will ensure that any excess
fuel is cleared from the inlet manifold.
9 Ensure that the throttle is fully released, allow
the meters to stabilise for a period of 5 to
30 seconds is normally sufficient, then check
the idle speed against that specified. If adjust-
ment is necessary, turn the idle speed
adjusting screw until the engine is idling at the
specified speed (see illustrations) . Any checks
and adjustments must be completed within
30 seconds of the meters stabilising.
1•14Every 10 000 miles or 12 months
9.9a Idle speed adjusting screw (A) and
mixture adjusting screw (B) (Weber TLM
carburettor)9.6 Cooling fan thermostatic switch multi-plug with temporary bridging wire
connected8.1 Manual transmission oil level/filler
plug (A), and selector shaft cap nut (B)
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the corrosion which would otherwise occur
as the corrosion inhibitors become progress-
ively less effective. Always use an ethylene
glycol-based antifreeze which is suitable for
use in mixed-metal cooling systems.
20If the antifreeze used is to Ford’s
specification, the levels of protection it affords
are indicated in the Specifications Section of
this Chapter. To give the recommended
standard mixture ratio for this antifreeze, 40%
(by volume) of antifreeze must be mixed with
60% of clean, soft water; if you are using any
other type of antifreeze, follow its
manufacturer’s instructions to achieve the
correct ratio. It is best to make up slightly
more than the system’s specified capacity, so
that a supply is available for subsequent
topping-up.
21 Before adding antifreeze, the cooling
system should be completely drained,
preferably flushed, and all hoses checked for
condition and security. As noted earlier, fresh
antifreeze will rapidly find any weaknesses in
the system.
22 After filling with antifreeze, a label should
be attached to the expansion tank, stating the
type and concentration of antifreeze used,
and the date installed. Any subsequent
topping-up should be made with the same
type and concentration of antifreeze. If
topping-up using antifreeze to Ford’s
specification, note that a 50/50 mixture is
permissible, purely for convenience.
23 Do not use engine antifreeze in the
windscreen/tailgate washer system, as it will
damage the vehicle’s paintwork. A
screenwash additive should be added to the
washer system in its maker’s recommended
quantities.
Antifreeze - notes on renewal
24 Ford state that, where antifreeze to Ford
specification ESD-M97B-49-A is used, it will
last the lifetime of the vehicle. This is subject
to it being used in the recommended
concentration, unmixed with any other type of
antifreeze or additive, and topped-up when
necessary using only that antifreeze mixed 50/50 with clean water. If any other type of
antifreeze is added, the lifetime guarantee no
longer applies; to restore the lifetime
protection, the system must be drained and
thoroughly reverse-flushed before fresh
coolant mixture is poured in.
25
If the vehicle’s history (and therefore the
quality of the antifreeze in it) is unknown,
owners who wish to follow Ford’s
recommendations are advised to drain and
thoroughly reverse-flush the system before
refilling with fresh coolant mixture. If the
appropriate quality of antifreeze is used, the
coolant can then be left for the life of the
vehicle.
26 If any antifreeze other than Ford’s is to be
used, the coolant must be renewed at regular
intervals to provide an equivalent degree of
protection; the conventional recommendation
is to renew the coolant every two or three
years.
27 The above assumes the use of a mixture
(in exactly the specified concentration) of
clean, soft water and of antifreeze to Ford’s
specification or equivalent. It is also assumed
that the cooling system is maintained in a
scrupulously-clean condition, by ensuring that
only clean coolant is added on topping-up,
and by thorough reverse-flushing whenever
the coolant is drained.
General cooling system checks
28 The engine should be cold for the cooling
system checks, so perform the following
procedure before driving the vehicle, or
after it has been shut off for at least three
hours.
29 Remove the expansion tank filler cap, and
clean it thoroughly inside and out with a rag.
Also clean the filler neck on the expansion
tank. The presence of rust or corrosion in the
filler neck indicates that the coolant should be
changed. The coolant inside the expansion
tank should be relatively clean and
transparent. If it is rust-coloured, drain and
flush the system, and refill with a fresh coolant
mixture.
30 Carefully check the radiator hoses and heater hoses along their entire length; renew
any hose which is cracked, swollen or
deteriorated (see Section 5).
31
Inspect all other cooling system
components (joint faces, etc.) for leaks. A leak
in the cooling system will usually show up as
white- or rust-coloured deposits on the area
adjoining the leak. Where any problems of this
nature are found on system components,
renew the component or gasket with
reference to Chapter 3.
32 Clean the front of the radiator with a soft
brush to remove all insects, leaves, etc,
embedded in the radiator fins. Be careful not
to damage the radiator fins, or cut your fingers
on them.
24 Air cleaner element renewal
1
1 The air cleaner filter element is located in
the air cleaner assembly mounted either on
top of the carburettor or CFi unit, or on the
left-hand or right-hand side of the engine
compartment at the front. Remove the air
cleaner lid as follows according to type.
Carburettor and CFi fuel
injection models
2 Undo the two or three retaining screws on
the top of the air cleaner lid (see illustration).
3 Release the clips, and lift off the air cleaner
cover (see illustration) .
EFi fuel injection models
4If the idle speed control valve is
mounted on the air cleaner, disconnect the
multi-plug and the air bypass hose from the
valve.
5 Disconnect the flexible hose between the
air cleaner lid and the air inlet duct or
turbocharger air intake.
6 Release the retaining clips and lift off the air
cleaner lid (see illustration) .
1•22Every 30 000 miles or three years
24.6 On EFi fuel injection engines, release
the retaining clips and lift off the air
cleaner lid24.3 . . . then spring back the clips and lift of the lid24.2 On carburettor and CFi fuel injectionengines, undo the air cleaner lid retaining
screws . . .
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25Unscrew the retaining bolt, and detach
the shift rod stabiliser from the transmission.
As it is detached, note the washer located
between the stabiliser and the transmission.
Tie the stabiliser and the shift rod up out of
the way.
Automatic transmission models
26 Unclip and detach the wiring connector
from the starter inhibitor switch (on the
transmission housing).
27 Referring to the relevant Part of Chapter 4
for details, unhook the accelerator (cam plate)
cable from the carburettor or fuel injection unit
(as applicable) at the transmission end of
the cable. Undo the retaining bolt and
detach the cable sheath bracket from the
transmission. Detach the cam plate cable
from the link.
28 Undo the two nuts from the selector cable
bracket which connects it to the lever on the
selector shaft. Disconnect the yoke from the
lever on the selector shaft and the cable from
the lever.
29 Unscrew the union nuts, and disconnect
the oil cooler feed and return pipes from the
transmission. Allow for a certain amount of
spillage, and plug the connections to prevent
the ingress of dirt.
All models
30 Unscrew the retaining nut and withdraw
the Torx-type clamp bolt securing the lower
suspension arm to the spindle carrier on each
side.
31 Refer to Chapter 10 for details, and
detach the right-hand and left-hand track rod
end balljoints from the spindle carriers.
32 On vehicles fitted with the anti-lock
braking system, refer to Chapter 9 and release
the right-hand modulator from its mounting
bracket without disconnecting the rigid brake
pipes or return hose. Tie the modulator
securely to the bulkhead. Additionally, undo
the three bolts securing the modulator
bracket.
33 Insert a suitable lever between the right-
hand driveshaft inner joint and the
transmission housing, and prise free the
driveshaft from the transmission; be prepared
for oil spillage from the transmission case
through the vacated driveshaft aperture. As it
is being prised free, simultaneously pull the
roadwheel outwards on that side, to enable
the driveshaft inboard end to separate
from the transmission. Once it is free,
suspend and support the driveshaft from the
steering gear, to prevent unnecessary strain
being placed on the driveshaft joints.
34 Insert a suitable plastic plug (or if
available, an old driveshaft joint), into the
transmission driveshaft aperture, to
immobilise the gears of the differential unit.
35 Proceed as described above in
paragraphs 33 and 34, and disconnect the
left-hand driveshaft from the transmission.
36 Connect a suitable lift hoist and sling to
the engine, connecting to the lifting eyes. When securely connected, take the weight of
the engine/transmission unit so that the
tension is relieved from the mountings.
37
Undo the retaining bolts and nuts and
detach the right-hand engine mounting from
the vehicle body.
38 Undo the four bolts securing the
transmission bearer to the underside of the
vehicle body. The transmission bearer is
removed with the engine/transmission
assembly.
39 Unscrew the three retaining bolts, and
remove the auxiliary drivebelt cover from
under the crankshaft pulley.
40 The engine/transmission unit should now
be ready for removal from the vehicle. Check
that all of the associated connections and
fittings are disconnected from the engine and
transmission, and positioned out of the way.
41 Enlist the aid of an assistant to help
steady and guide the power unit down
through the engine compartment as it is
removed. If available, position a suitable
engine trolley or crawler board under the
engine/transmission so that when lowered,
the power unit can be withdrawn from the
front end of the vehicle, and then moved to
the area where it is to be cleaned and
dismantled. On automatic transmission
models, particular care must be taken not to
damage the transmission fluid pan (sump)
during the removal and subsequent refitting
processes.
42 Carefully lower the engine and
transmission unit, ensuring that no fittings
become snagged. Detach the hoist and
remove the power unit from under the vehicle.
43 Referring to the relevant Part of Chapter 7,
separate the transmission from the engine.
44 While the engine/transmission is removed,
check the mountings; renew them if they are
worn or damaged. Similarly, check the
condition of all coolant and vacuum hoses
and pipes (see Chapter 1). Components that
are normally hidden can now be checked
properly, and should be renewed if there is
any doubt at all about their condition. Where
the vehicle is fitted with manual transmission,
take the opportunity to inspect the clutch
components (see Chapter 6). It is regarded by
many as good working practice to renew the
clutch assembly as a matter of course,
whenever major engine overhaul work is
carried out. Check also the condition of all
components (such as the transmission oil
seals) disturbed on removal, and renew any
that are damaged or worn.
Refitting
45 Refitting is a reversal of removal, however
note the following additional points:
a) Refer to the applicable Chapters and Sections as for removal.
b) Fit new spring clips to the grooves in the
inboard end of the right- and left-hand
driveshaft joints. Lubricate the splines
with transmission oil prior to fitting. c) Renew the exhaust flange gasket when
reconnecting the exhaust. Ensure that all
wires are routed clear of the exhaust
system and, on catalytic converter
models, ensure that the heat shields are
securely and correctly fitted.
d) Ensure that all earth lead connections are
clean and securely made.
e) Tighten all nuts and bolts to the specified torque.
f) Fit a new oil filter, and refill the engine and transmission with oil, with reference to
Chapter 1.
g) Refill the cooling system with reference to Chapter 1.
h) Refit the alternator and starter motor with reference to Chapter 5A.
i) Where applicable, refit the power steering pump with reference to Chapter 10.
46 When engine and transmission refitting is
complete, refer to the procedures described
in Section 19 before restarting the engine.
5 Engine/transmission -
removal and refitting
(Zetec engines)
3
Warning: Petrol is extremely
flammable, so take extra
precautions when disconnecting
any part of the fuel system.
Don’t smoke, or allow naked flames or
bare light bulbs, in or near the work area,
and don’t work in a garage where a
natural-gas appliance (such as a clothes
dryer or water heater) is installed. If you
spill petrol on your skin, rinse it off
immediately. Have a fire extinguisher rated
for petrol fires handy, and know how to
use it.
Note: Read through the entire Section, as well
as reading the advice in Section 2, before
beginning this procedure. The engine and
transmission are removed as a unit, lowered to
the ground and removed from underneath,
then separated outside the vehicle.
Removal
1 Park the vehicle on firm, level ground, apply
the handbrake firmly, and slacken the nuts
securing both front roadwheels.
2 Depressurise the fuel system as described
in Chapter 4D.
3 Disconnect the battery negative (earth) lead
(refer to Chapter 5A, Section 1).
4 Place protective covers on the wings, then
remove the bonnet (see Chapter 11).
5 Drain the cooling system and the engine oil
(see Chapter 1).
6 Remove the air inlet components and the
complete air cleaner assembly as described in
Chapter 4D.
7 Equalise the pressure in the fuel tank by
removing the filler cap, then release the fuel
feed and return quick-release couplings, and
pull the hoses off the fuel pipes. Plug or cap
all open fittings.
2D•10 Engine removal and overhaul procedures
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careful not to scratch the bearing - use your
fingernail or the edge of a credit card.
Final crankshaft refitting
18Carefully lift the crankshaft out of the
engine. Clean the bearing surfaces of the
shells in the block, then apply a thin, uniform
layer of clean molybdenum disulphide- based
grease, engine assembly lubricant, or clean
engine oil to each surface. Coat the
thrustwasher surfaces as well.
19 Lubricate the crankshaft oil seal journals
with molybdenum disulphide-based grease,
engine assembly lubricant, or clean engine oil.
20 Make sure the crankshaft journals are
clean, then lay the crankshaft back in place in
the block (see illustration) . Clean the bearing
surfaces of the shells in the caps, then
lubricate them. Install the caps in their
respective positions, with the arrows pointing
to the timing belt/chain end of the engine.
21 Working on one cap at a time, from the
centre main bearing outwards (and ensuring
that each cap is tightened down squarely and
evenly onto the block), tighten the main
bearing cap bolts to the specified torque
wrench setting.
22 Rotate the crankshaft a number of times
by hand, to check for any obvious binding.
23 Check the crankshaft endfloat (see Sec-
tion 12). It should be correct if the crankshaft
thrust faces aren’t worn or damaged.
24 Refit the crankshaft left-hand oil seal
carrier, and install a new seal (see Part A, B
or C of this Chapter according to engine type).
18 Piston/connecting rod
assemblies - refitting and big-end
bearing running clearance check
4
Note: On HCS engines, new big-end bearing
cap retaining bolts will be required for
reassembly.
1 Before refitting the piston/connecting rod
assemblies, the cylinder bores must be
perfectly clean, the top edge of each cylinder
must be chamfered, and the crankshaft must
be in place.
2 Remove the big-end bearing cap from No 1
cylinder connecting rod (refer to the marks
noted or made on removal). Remove the
original bearing shells, and wipe the bearing
recesses of the connecting rod and cap with a
clean, lint-free cloth. They must be kept
spotlessly-clean!
Big-end bearing running
clearance check
3 Clean the back of the new upper bearing
shell, fit it to the connecting rod, then fit the
other shell of the bearing set to the big-end
bearing cap. Make sure that the tab on each
shell fits into the notch in the rod or cap
recess (see illustration) .
Caution: Don’t hammer the shells into
place, and don’t nick or gouge the bearing
face. Don’t lubricate the bearing at this
time.
4 It’s critically important that all mating
surfaces of the bearing components are
perfectly clean and oil-free when they’re
assembled.
5 Position the piston ring gaps as described
in Section 16, lubricate the piston and rings
with clean engine oil, and attach a piston ring
compressor to the piston. Leave the skirt
protruding about a quarter-inch, to guide the
piston into the cylinder bore. The rings must
be compressed until they’re flush with the
piston.
6 Rotate the crankshaft until No 1 crankpin
(big-end) journal is at BDC (Bottom Dead
Centre), and apply a coat of engine oil to the
cylinder walls.
7 Arrange the No 1 piston/connecting rod
assembly so that the arrow on the piston crown points to the timing belt/chain end of
the engine. Gently insert the assembly into the
No 1 cylinder bore, and rest the bottom edge
of the ring compressor on the engine block.
8
Tap the top edge of the ring compressor to
make sure it’s contacting the block around its
entire circumference.
9 Gently tap on the top of the piston with the
end of a wooden hammer handle (see
illustration) , while guiding the connecting
rod’s big-end onto the crankpin. The piston
rings may try to pop out of the ring
compressor just before entering the cylinder
bore, so keep some pressure on the ring
compressor. Work slowly, and if any
resistance is felt as the piston enters the
cylinder, stop immediately. Find out what’s
binding, and fix it before proceeding. Do not,
for any reason, force the piston into the
cylinder - you might break a ring and/or the
piston.
10 To check the big-end bearing running
clearance, cut a piece of the appropriate-size
Plastigauge slightly shorter than the width of
the connecting rod bearing, and lay it in place
on the No 1 crankpin (big-end) journal, parallel
with the crankshaft centre-line (see
illustration 17.11).
11 Clean the connecting rod-to-cap mating
surfaces, and refit the big-end bearing cap.
Tighten the cap bolts evenly - on the HCS and
Zetec engines, first use a torque wrench to
tighten the bolts to the Stage 1 torque setting,
then use an ordinary socket extension bar and
an angle gauge to tighten the bolts further
through the Stage 2 angle (see illustration).
On the CVH and PTE engines, tighten the
bolts progressively to the specified torque;
further angle-tightening is not required on
these engines. Use a thin-wall socket, to
avoid erroneous torque readings that can
result if the socket is wedged between the
cap and nut. If the socket tends to wedge
itself between the nut and the cap, lift up on it
slightly until it no longer contacts the cap.
Don’t rotate the crankshaft at any time during
this operation!
12 Unscrew the bolts and detach the cap,
being very careful not to disturb the
Plastigauge.
13 Compare the width of the crushed
2D•24 Engine removal and overhaul procedures
18.11 Angle-tightening the big-end bolts
using the correct tool18.9 The piston can be driven gently into
the cylinder bore with the end of a wooden
or plastic hammer handle18.3 Tab on each big-end bearing shell
must engage with notch in connecting rod
or cap
17.20 Refit the crankshaft after checkingbearing clearances
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39With the drivebelt tensioned correctly,
tighten the pivot and adjuster bolts to the
specified torque. Re-check the tension of the
drivebelt after tightening the bolts.
40 Reconnect the rigid brake pipes to the
modulator, tightening the unions to seal the
system.
41 Refit the modulator drivebelt cover and
secure with its two retaining bolts. Take care
not to damage the driveshaft CV joint gaiter as
the cover is eased into position.
42 Refit the belt-break switch to the
modulator drivebelt cover, taking care not to
damage the belt contact arm as it passes
through the cover.
43 Reconnect the modulator return hose by
pushing the hose firmly into its brake fluid
reservoir location, then lever out the collar to
retain it.
44 Refit the front suspension crossmember
and the one-piece undertray, as applicable.
45 Refit the roadwheels, then remove the
axle stands and lower the vehicle to the
ground. Tighten the wheel nuts to the
specified torque.
46 Top-up the brake fluid reservoir using
fresh fluid of the specified type (see “ Weekly
checks ”), then bleed the brake hydraulic
system in accordance with Section 14. Refit
the reservoir filler cap and the warning
indicator wiring multi-plug on completion.
47 Reconnect the battery negative lead.
Modulator drivebelt
48Disconnect the battery negative (earth)
lead (refer to Chapter 5A, Section 1).
49 Chock the rear wheels then jack up the
front of the car and support it on axle stands
(see “Jacking and Vehicle Support” ). Remove
the relevant front roadwheel.
50 Remove the one-piece undertray where
fitted, by turning its bayonet-type fasteners,
and on XR2i models, remove the front
suspension crossmember (see Chapter 10).
51 Remove the belt-break switch from the
relevant drivebelt cover, then remove the
drivebelt cover, as described in the previous
sub-Section.
52 Slacken the modulator pivot and adjuster
bolts to release drivebelt tension, then slip the
drivebelt from the modulator.
53 Remove the track rod end balljoint from
the steering arm on the spindle carrier (see
Chapter 10).
54 Disconnect the anti-roll bar connecting
link (where applicable) and release the brake
hose from their locations on the suspension
strut.
55 Remove the pinch bolt and nut securing
the lower suspension arm balljoint to the
spindle carrier, and separate the balljoint from
the spindle carrier assembly.
56 To release the driveshaft inner CV joint
from the differential, have an assistant pull the
spindle carrier away from the centre of the
vehicle whilst you insert a lever between the
inner CV joint and the transmission casing,
then firmly strike the lever with the flat of the hand, but be careful not to damage adjacent
components. Make provision for escaping
transmission oil, if possible plugging the
opening to prevent excessive loss. Do not
allow the CV joints to bend more than 20°
from the horizontal or internal damage may
occur. If both driveshafts are to be removed,
immobilise the differential by inserting an old
joint or suitable shaft, before the other
driveshaft is removed.
57
Slide the drivebelt off the driveshaft.
58 Remove the snap-ring from the groove in
the splines of the inner CV joint. This snap-
ring must be renewed every time the
driveshaft is withdrawn from the differential.
59 With the drivebelt removed, closely
examine the condition of the belt over its
entire length. Renew the belt if any cracks are
noticed in the fabric at the roots of the teeth, if
there is any abrasion of the fabric facing
material, or if there are any tears starting from
the edge of the belt.
60 If, since the drivebelts were last renewed,
a vehicle has covered more than 30 000 miles
(48 000 km) or a period of more than two
years has elapsed, the drivebelts should be
renewed as a matter of course.
61 Prior to refitting the drivebelt, thoroughly
clean its CV joint pulley location.
62 Fit the drivebelt over the driveshaft then,
with a new snap-ring fitted to the inner CV
joint splines, lubricate the splines with
transmission oil. Remove the temporary plug
and insert the inner CV joint to its
transmission casing location. Press against
the spindle carrier so that the snap-ring
engages fully to hold the CV joint splines in
the differential.
63 Refitting is now a reversal of the removal
procedure, tensioning the drivebelt as
described in the previous sub-Section. Ensure
that the pinch-bolt securing the lower
suspension arm balljoint to the spindle carrier
locates in the annular groove on the balljoint
spindle. Secure the track rod and balljoint,
using a new split pin. Tighten the suspension
components to their specified torque (see
Chapter 10).
64 Check the level of the transmission oil,
and top-up as required (see Chapter 1).
Modulator belt-break switch
65 Modulator belt-break switches are fitted
to each of the two drivebelt covers, and clip
into position. To remove, gently squeeze the
protruding lever on the switch towards the
main switch body and lift out, ensuring that
the belt contact arm does not catch on the
drivebelt cover.
25 Load-apportioning valve (ABS models) - adjustment
3
1Before attempting to adjust the load-
apportioning valves, the vehicle must be at its
kerb weight, ie with approximately half a tank
of fuel and carrying no load. Note that a
special setting tool will be required to adjust
the valves - this can be fabricated, to the
dimensions shown (see illustration).
2 Raise the vehicle on ramps or drive it over
an inspection pit, so that working clearance is
obtained with the full weight of the vehicle
resting on its roadwheels. Remove the spare
wheel and its carrier.
3 To check adjustment, insert the load-
apportioning valve setting tool into the nylon
sleeve without pre-loading the valve. If unable
to insert the tool, carry out the following
adjustment procedure.
4 Slacken the operating link adjustment fixing
screw then insert the setting tool into the
nylon sleeve, applying light pressure to the
operating link upper arm, so that the setting
tool fully locates. With the setting tool just
resting up against the adjustment post,
tighten the operating link adjustment fixing
screw to the specified torque (see
illustration) .
5 Repeat the procedure on the other valve.
6 Refit the spare wheel on completion.
26 Load-apportioning valve
(ABS models) - removal and
refitting
3
1 Minimise hydraulic fluid loss by
disconnecting the wiring multi-plug from the
fluid level warning indicator in the master
9•16 Braking system
25.4 Load-apportioning valve adjustment
A Setting tool
B Operating link adjustment fixing screw
C Adjustment post
25.1 Load-apportioning valve adjustment tool (dimensions given in mm)
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bearing, upper spring seat, gaiter and
bump-stop from the piston rod (see
illustration) .
4 The suspension strut and coil spring may
now be separated. If a new suspension strut
is to be fitted there is no need to release the
coil spring from compression, but if a new coil
spring is to be fitted, release the compressors
gently until the spring is in its released state,
then remove it.
Examination
5 With the strut assembly now completely
dismantled, examine the mounting
components for wear, damage or
deformation. Renew any of the components
as necessary.
6 Examine the strut for signs of fluid leakage.
Check the strut piston for signs of pitting
along its entire length, and check the strut
body for signs of damage or corrosion. Test
the operation of the strut, holding it in an
upright position, by moving the piston through
a full stroke, and then through short strokes of
50 to 100 mm. In both cases, the resistance
felt should be smooth and continuous. If the
resistance is jerky, or uneven, or if there is any
visible sign of wear or damage to the strut,
renewal is necessary.
Reassembly
7 If a new spring is to be fitted, engage the compressors as during removal, and
compress the spring sufficiently to enable
suspension strut reassembly.
8
Reunite the spring and suspension strut,
and refit the bump-stop gaiter, spring seat,
thrust bearing and lower cup seat mounting,
renewing components as necessary. Refit the
spring retaining nut and tighten to the
specified torque.
9 Carefully release the spring tension,
ensuring that the spring locates correctly into
its upper and lower spring seats (see
illustration) .
10 Remove the spring compressors.
11 The rubber insulator fitted to the top of the
inner wing is a simple push fit, and is easily
replaceable. Ensure when replacing this,
that the lip sits evenly around the locating
hole.
6 Front suspension anti-roll
bar - removal and refitting
2
Removal
1Chock the rear wheels then jack up the
front of the car and support it on axle stands
(see “Jacking and Vehicle Support” ). Remove
the front roadwheels.
2 Remove the one-piece undertray where
fitted, by turning its bayonet-type fasteners,
and on XR2i models, remove the front suspension crossmember as described in
Section 7.
3
Undo the nut securing the upper end of the
anti-roll bar connecting link to the suspension
strut bracket, and disconnect the link (see
illustration) .
4 Undo the nut securing the lower end of the
connecting link to the anti-roll bar, and
remove the link.
5 Remove the two bolts securing the anti-roll
bar brackets to each lower suspension arm
mounting bracket (see illustration), remove
the anti-roll bar brackets and withdraw the
anti-roll bar from the vehicle.
6 The rubber bushes locating the anti-roll bar
can be removed by sliding them off over the
link connections.
Refitting
7 Refitting is a reversal of the removal
procedure, tightening the retaining nuts to the
specified torque settings.
7 Front suspension crossmember -
removal and refitting
2
Note: The front suspension crossmember is
only fitted to XR2i models.
Removal
1 Chock the rear wheels then jack up the
front of the car and support it on axle stands
(see “Jacking and Vehicle Support” ). Remove
the front roadwheels.
2 Remove the one-piece undertray where
fitted, by turning its bayonet-type fasteners.
3 The crossmember, which serves as an
additional bracing component, is located
between the lower suspension arm mounting
brackets, and is secured to these brackets by
four bolts. To remove it, simply undo the four
bolts and lower it from the vehicle.
Refitting
4 Refitting is the reverse sequence to
removal, ensuring that the bolts are tightened
to the specified torque.
Suspension and steering 10•7
5.9 Correct spring location in its lower seat5.3 Exploded view of front suspension strut assembly
6.5 Anti-roll bar bracket and mountingbolts6.3 Anti-roll bar connecting link-to-strutconnection
10
1595Ford Fiesta Remake
A Suspension strut
B Coil spring
C Bump-stop
D Gaiter
E Upper spring seat
F Thrust bearing
G Lower cup seat
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3Unscrew and remove the upper mounting
through-bolt and nut.
4 Withdraw the upper mounting cup and the
spring seat.
5 The suspension strut and coil spring can now
be separated. If the coil spring or strut is to be
renewed, the original coil spring must be
released from the compressor. If it is to be re-
used, the coil spring can be left in compression.
Examination
6 With the strut assembly now completely
dismantled, examine the mounting
components for wear, damage or deformation.
Renew any of the components as necessary.
7 Examine the strut for signs of fluid leakage.
Check the strut piston for signs of pitting
along its entire length, and check the strut
body for signs of damage or deterioration of
the mountings. Test the operation of the strut,
holding it in an upright position, by moving the
piston through a full stroke, and then through
short strokes of 50 to 100 mm. In both cases,
the resistance felt should be smooth and
continuous. If the resistance is jerky, or
uneven, or if there is any visible sign of wear
or damage to the strut, renewal is necessary.
Reassembly
8 Reassembly is a reversal of the dismantling
procedure but note the following points: a) When the spring is located over the
suspension strut, the spring seat, cup and
through-bolt fitted, tighten the retaining
bolt to the specified torque.
b) When reassembled, check that the upper
and lower spring tails are correctly
engaged with their spring seats before
removing the spring compressor.
12 Rear axle (all models except
Courier) -
removal and refitting
3
Removal
1 Chock the front wheels then jack up the
rear of the car and support it on axle stands
(see “Jacking and Vehicle Support” ). Remove
the rear roadwheels.
2 Refer to Chapter 9 for details, and disconnect
the handbrake cable equaliser from the primary
cable. Remove the handbrake rear cable from
its adjuster and its fixed body locations.
3 Disconnect the rear brake flexible hydraulic
brake hoses from their rigid line connections.
Clamp the hoses before disconnecting them,
to minimise the fluid loss and air entry into the
hydraulic system (see Chapter 9 for details).
4 On ABS-equipped models, undo the
retaining nuts and detach the ABS load-
apportioning valve operating links from the
axle beam. Do not remove the load-
apportioning valve (see Chapter 9).
5 Locate suitable jacks or axle stands under
the axle beam to support its weight (not to lift
it), then unscrew the four mounting bracket
bolts each side. 6
Unscrew and remove the strut-to-axle
mounting bolt each side.
7 Check that all associated fittings are clear,
then lower the axle and remove it from under
the vehicle.
8 If the twist beam axle has been damaged, it
must be renewed. Refer to Chapter 9 for
details on removing the rear brakes from the
axle. To remove the front mounting/pivot
brackets from the axle, unscrew the pivot bolt.
Refitting
9 Refitting is a reversal of the removal
procedure, but note the following: a) Reconnect the axle at the front floor mountings first, and tighten the retaining
bolts to the specified torque.
b) Reconnect the axle to the suspension struts, but do not fully retighten the securing
bolts until after the vehicle is lowered to the
ground and is standing on its wheels.
c) Ensure that all brake fluid line connections are clean before reconnecting them. Refer
to the appropriate Sections in Chapter 9
for specific details on reconnecting the
brake lines, bleeding the brake hydraulic
system, and for reconnecting the
handbrake cable and its adjustment.
d) When the vehicle is lowered and is standing
on its wheels, tighten the suspension
fastenings to their specified torque settings.
13 Rear axle pivot bushes (all
models except Courier) -
renewal
3
Note: Two different types of pivot bushes
have been fitted during the course of Fiesta
production. It is understood that once stocks
of the early type are exhausted, only the latter
type will be supplied by Ford parts dealers. If
renewing pivot bushes on a pre-April 1990
model, and only the later type bushes are
available, fit the new bushes as described
from paragraph 15 onward.
Pre-April 1990 models
1 Chock the front wheels then jack up the
rear of the car and support it on axle stands
(see “Jacking and Vehicle Support” ).2
Position a suitable support (preferably
adjustable) under the axle twist beam so that
it is capable of carrying the weight of the axle
(not the weight of the vehicle).
3 On ABS-equipped models, undo the
retaining nuts and detach the ABS load-
apportioning valve operating links from the
axle beam. Do not remove the load-
apportioning valve (see Chapter 9).
4 Unscrew the nuts, withdraw the pivot bolts,
then lower the rear axle so that the bushes are
clear of their mounting brackets (see
illustration) . Take care not to allow the brake
pipes to become distorted and stretched - if
necessary, disconnect the hydraulic lines (see
Chapter 9 for details).
5 Undo the four body mounting bracket bolts
and remove the brackets.
6 Using a soft-faced hammer and a suitable
punch or drift, drive the bushes from their
locations, taking care not to raise any burrs on
the trailing arm eyes.
7 To fit the new bushes, obtain a steel tube of
a diameter slightly less than that of the bush
location in the axle, various flat washers and a
long bolt and nut.
8 Place the new bush in position in its axle
location with the bush collar nearest to the
outer edge of the vehicle. The bush must be
installed with its voids positioned as shown
(see illustration) . Using the steel tube,
washers, long bolt and nut, draw the bush
inwards towards the centre of the vehicle (see
illustration) . Care should be taken to avoid
damage to the bush and to obtain correct
10•10 Suspension and steering
13.8b Fitting pivot bush with its collar
(arrowed) towards the outer edge of the vehicle13.8a Correct pivot bush positioning intrailing arm
A Left-hand side B Right-hand side
13.4 Pivot bush bolt (A) and body mounting bracket bolts (B)
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1595 Ford Fiesta Remake
MOT test checksREF•13
REF
MExamine the handbrake mechanism,
checking for frayed or broken cables,
excessive corrosion, or wear or insecurity of
the linkage. Check that the mechanism works
on each relevant wheel, and releases fully,
without binding.
M It is not possible to test brake efficiency
without special equipment, but a road test can
be carried out later to check that the vehicle
pulls up in a straight line.
Fuel and exhaust systems
M Inspect the fuel tank (including the filler
cap), fuel pipes, hoses and unions. All
components must be secure and free fr om
leaks.
M Examine the exhaust system over its entire
length, checking for any damaged, broken or
missing mountings, security of the retaining
clamps and rust or corrosion.
Wheels and tyres
M Examine the sidewalls and tread area of
each tyre in turn. Check for cuts, tears, lumps,
bulges, separation of the tread, and exposure
of the ply or cord due to wear or damage.
Check that the tyre bead is correctly seated
on the wheel rim, that the valve is sound and pr
operly seated, and that the wheel is not
distorted or damaged.
M Check that the tyres are of the correct size
for the vehicle, that they are of the same size
and type on each axle, and that the pressur es
ar e correct.
M Check the tyre tread depth. The legal
minimum at the time of writing is 1.6 mm over
at least three-quarters of the tread width.
Abnormal tread wear may indicate incorrect
fr ont wheel alignment.
Body corrosion
M Check the condition of the entire vehicle
structur e for signs of corrosion in load-bearing
ar eas. (These include chassis box sections,
side sills, cross-members, pillars, and all
suspension, steering, braking system and
seat belt mountings and anchorages.) Any
corrosion which has seriously reduced the
thickness of a load-bearing area is likely to
cause the vehicle to fail. In this case
pr ofessional repairs are likely to be needed.
M Damage or corrosion which causes sharp
or otherwise dangerous edges to be exposed
will also cause the vehicle to fail.
Petrol models
M Have the engine at normal operating
temperatur e, and make sure that it is in good
tune (ignition system in good order, air filter
element clean, etc).
M Befor e any measurements are carried out,
raise the engine speed to around 2500 rpm,
and hold it at this speed for 20 seconds. Allow the engine speed to return to idle, and watch
for smoke emissions from the exhaust
tailpipe. If the idle speed is obviously much
too high, or if dense blue or clearly-visible
black smoke comes from the tailpipe for more
than 5 seconds, the vehicle will fail. As a rule
of thumb, blue smoke signifies oil being burnt
(engine wear) while black smoke signifies
unbur nt fuel (dirty air cleaner element, or other
carbur ettor or fuel system fault).
M An exhaust gas analyser capable of
measuring carbon monoxide (CO) and
hydr ocarbons (HC) is now needed. If such an
instrument cannot be hired or borrowed, a
local garage may agree to perform the check
for a small fee.
CO emissions (mixture)
M At the time of writing, the maximum CO
level at idle is 3.5% for vehicles first used after
August 1986 and 4.5% for older vehicles.
Fr om January 1996 a much tighter limit
(ar ound 0.5%) applies to catalyst-equipped
vehicles first used from August 1992. If the
CO level cannot be reduced far enough to
pass the test (and the fuel and ignition
systems are otherwise in good condition) then
the carburettor is badly worn, or there is some
pr oblem in the fuel injection system or
catalytic converter (as applicable).
HC emissionsM With the CO emissions within limits, HC
emissions must be no more than 1200 ppm
(parts per million). If the vehicle fails this test
at idle, it can be re-tested at around 2000 rpm;
if the HC level is then 1200 ppm or less, this
counts as a pass.
M Excessive HC emissions can be caused by
oil being burnt, but they are more likely to be
due to unburnt fuel.
Diesel models
M The only emission test applicable to Diesel
engines is the measuring of exhaust smoke
density . The test involves accelerating the
engine several times to its maximum
unloaded speed.
Note: It is of the utmost importance that the
engine timing belt is in good condition before
the test is carried out.
M
Excessive smoke can be caused by a dirty
air cleaner element. Otherwise, professional
advice may be needed to find the cause.
4Checks carried out on
YOUR VEHICLE’S EXHAUST
EMISSION SYSTEM
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