wheel FORD GRANADA 1985 Service Manual PDF

Speed control module
Models before April 1992
9Refer to Section 27. The speed control
module shares the same mountings as the
AWS module; the AWS module is larger.
Models from April 1992
10The speed control module fitted to these
models is situated behind the glovebox on the
left-hand side of the facia. To gain access to
the module remove the left-hand facia
undercover panel. The speed control module
is vertically mounted just to the right of the
engine management module. Push the module
upwards to release the retaining clips then
lower it out from under the facia and
disconnect the wiring connector (see
illustration).
11Refitting is a reverse of the removal
procedure ensuring that the module is
securely retained by the retaining clips.
Vacuum pump
12The vacuum pump is located behind the
left-hand headlight on carburettor models, and
behind the right-hand headlight on fue-
injection models. Start by removing the
appropriate headlight unit.
13Disconnect the multi-plug and the vacuum
hose from the pump. The multi-plug is
released by squeezing and pulling it at the
same time.
14Prise out the three mountings and remove
the pump.
15When refitting, pull the pump mountings
into position with pliers. 16Reconnect the vacuum hose and the
multi-plug, then refit the headlight unit.
Vacuum servo
17Disconnect the servo-to-throttle linkage
cable at one end.
18Disconnect the vacuum hose from the
servo.
19Undo the servo retaining nut and remove
the servo from its bracket.
20Refit by reversing the removal operations.
On all but 2.0 litre carburettor models, adjust
the cable so that it is slightly slack when the
throttle linkage is in the idle position (pedal
released).
21On 2.0 litre carburettor models, the
stepper motor plunger must be withdrawn
before the cable is adjusted. Proceed as
follows.
22Observe the stepper motor plunger. Have
an assistant switch on the ignition for a few
seconds, then switch it off again. When the
ignition is switched off, the stepper motor
plunger will retract fully (“vent manifold”
position). Disconnect the battery negative lead
while the stepper motor plunger is retracted.
23Adjust the servo cable so that it is slightly
slack, then reconnect the battery negative
lead.
Printed circuit board
24The printed circuit board is located in the
steering wheel. It can be removed after
detaching the horn contact plate and
disconnecting the switch spade terminals as
described at the beginning of this Section.1Disconnect the battery negative lead.
2Pull off the rubber sealing strip from the top
of the plenum chamber (see illustration).
3Pull the two wiring harness clips from the
front of the plenum chamber (see illustration).
4Remove the two screws and two clips
which secure the plenum chamber cover (see
illustration). Lift out the cover.
5Disconnect the multi-plug from the blower
motor resistor. Also disconnect the motor
earth cable (see illustration).
6Remove the two nuts which secure the
motor assembly. Lift out the motor, casing and
resistor together.
7The casing halves and the resistor can be
separated from the motor after prising open
the clamp which holds the casing halves
together.
8Refit by reversing the removal operations.
1Two DIN standard extraction tools will be
needed to remove the radio/cassette unit.
These tools are available from vehicle audio
equipment specialists.
Radio (only)
2Pull off the control knobs, remove the
spindle nuts and washers and remove the
radio face plate.
3Push the two securing lugs inwards, at the
same time pulling the radio from its location.
The services of an assistant may be required.
4Withdraw the radio and disconnect the
aerial cable and the other wiring plugs from it.
5If a new radio is to be fitted, transfer the
support brackets and locating plate from the
old unit to the new one.
6Refit by reconnecting the wiring to the radio,
then sliding it into its aperture. Press it in until
the securing lugs click into position.
7Refit the face plate, spindle nuts and washers
and control knobs. The top of the face plate is
marked on the side which faces the radio.
30Radio or radio/cassette
player (original equipment) -
removal and refitting
29Heater blower motor -
removal and refitting
13•20Body electrical system
28.10 Removing the speed control module
29.4 One of the plenum chamber cover
clips29.5 Blower motor showing wiring
connections
29.2 Pulling off the rubber sealing strip29.3 Pulling out a wiring harness clip
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The vehicle owner who does his or her own maintenance according
to the recommended service schedules should not have to use this
section of the manual very often. Modern component reliability is such
that, provided those items subject to wear or deterioration are
inspected or renewed at the specified intervals, sudden failure is
comparatively rare. Faults do not usually just happen as a result of
sudden failure, but develop over a period of time. Major mechanical
failures in particular are usually preceded by characteristic symptoms
over hundreds or even thousands of miles. Those components which
do occasionally fail without warning are often small and easily carried
in the vehicle.With any fault-finding, the first step is to decide where to begin
investigations. Sometimes this is obvious, but on other occasions, a
little detective work will be necessary. The owner who makes half a
dozen haphazard adjustments or replacements may be successful in
curing a fault (or its symptoms), but will be none the wiser if the fault
recurs, and ultimately may have spent more time and money than was
necessary. A calm and logical approach will be found to be more
satisfactory in the long run. Always take into account any warning
signs or abnormalities that may have been noticed in the period
preceding the fault - power loss, high or low gauge readings, unusual
smells, etc - and remember that failure of components such as fuses or
REF•5Fault Finding
Engine1
m mEngine fails to rotate when attempting to start
m mStarter motor turns engine slowly
m mEngine rotates, but will not start
m mEngine difficult to start when cold
m mEngine difficult to start when hot
m mStarter motor noisy or excessively-rough in engagement
m mEngine starts, but stops immediately
m mEngine idles erratically
m mEngine misfires at idle speed
m mEngine misfires throughout the driving speed range
m mEngine hesitates on acceleration
m mEngine stalls
m mEngine lacks power
m mEngine backfires
m mOil pressure warning light illuminated with engine running
m mEngine runs-on after switching off
m mEngine noises
Cooling system2
m
mOverheating
m mOvercooling
m mExternal coolant leakage
m mInternal coolant leakage
m mCorrosion
Fuel and exhaust systems3
m
mExcessive fuel consumption
m mFuel leakage and/or fuel odour
m mExcessive noise or fumes from exhaust system
Clutch4
m
mPedal travels to floor - no pressure or very little resistance
m mClutch fails to disengage (unable to select gears)
m mClutch slips (engine speed increases, with no increase in vehicle
speed)
m mJudder as clutch is engaged
m mNoise when depressing or releasing clutch pedal
Manual gearbox5
m
mNoisy in neutral with engine running
m mNoisy in one particular gear
m mDifficulty engaging gears
m mJumps out of gear
m mVibration
m mLubricant leaks
Automatic transmission6
m
mFluid leakage
m mTransmission fluid brown, or has burned smellm mGeneral gear selection problems
m mTransmission will not downshift (kickdown) with accelerator fully
depressed
m mEngine will not start in any gear, or starts in gears other than Park
or Neutral
m mTransmission slips, shifts roughly, is noisy, or has no drive in
forward or reverse gears
Propeller shaft7
m
mClicking or knocking noise on turns (at slow speed on full-lock)
m mVibration when accelerating or decelerating
Final drive and driveshafts8
m
mExcessive final drive noise
m mOil leakage from final drive
m mGrating, knocking or vibration from driveshafts
Braking system9
m
mVehicle pulls to one side under braking
m mNoise (grinding or high-pitched squeal) when brakes applied
m mExcessive brake pedal travel
m mBrake pedal feels spongy when depressed
m mExcessive brake pedal effort required to stop vehicle
m mJudder felt through brake pedal or steering wheel when braking
m mPedal pulsates when braking hard
m mBrakes binding
m mRear wheels locking under normal braking
Suspension and steering systems10
m
mVehicle pulls to one side
m mWheel wobble and vibration
m mExcessive pitching and/or rolling around corners, or during braking
m mWandering or general instability
m mExcessively-stiff steering
m mExcessive play in steering
m mLack of power assistance
m mTyre wear excessive
Electrical system11
m
mLights inoperative
m mIgnition/no-charge warning light remains illuminated with engine
running
m mIgnition/no-charge warning light fails to come on
m mBattery will not hold a charge for more than a few days
m mInstrument readings inaccurate or erratic
m mHorn inoperative, or unsatisfactory in operation
m mWindscreen/tailgate wipers inoperative, or unsatisfactory in
operation
m mWindscreen/tailgate washers inoperative, or unsatisfactory in
operation
m mElectric windows inoperative, or unsatisfactory in operation
m mCentral locking system inoperative, or unsatisfactory in operation
Introduction
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REF•6
Engine fails to rotate when attempting to start
m mBattery terminal connections loose or corroded (Chapter 1).
m mBattery discharged or faulty (Chapter 5).
m mBroken, loose or disconnected wiring in the starting circuit
(Chapter 5).
m mDefective starter solenoid or switch (Chapter 5).
m mDefective starter motor (Chapter 5).
m mStarter pinion or flywheel/driveplate ring gear teeth loose or broken
(Chapters 2 or 5).
m mEngine earth strap broken or disconnected.
Starter motor turns engine slowly
m
mPartially-discharged battery (recharge, use jump leads, or push
start) (Chapter 5).
m mBattery terminals loose or corroded (Chapter 1).
m mBattery earth to body defective (Chapter 5).
m mEngine earth strap loose.
m mStarter motor (or solenoid) wiring loose (Chapter 5).
m mStarter motor internal fault (Chapter 5).
Engine rotates, but will not start
m
mFuel pump inertia switch tripped (electric pump) (Chapter 4).
m mFuel tank empty.
m mBattery discharged (engine rotates slowly) (Chapter 5).
m mBattery terminal connections loose or corroded (Chapter 1).
m mIgnition components damp or damaged (Chapters 1 and 5).
m mBroken, loose or disconnected wiring in the ignition circuit
(Chapters 1 and 5).
m mWorn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m mFuel injection system fault (Chapter 4).
m mMajor mechanical failure (eg broken timing chain) (Chapter 2).
Engine difficult to start when cold
m
mBattery discharged (Chapter 5).
m mBattery terminal connections loose or corroded (Chapter 1).
m mWorn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m mFuel injection system fault (Chapter 4).
m mOther ignition system fault (Chapters 1 and 5).
m mLow cylinder compressions (Chapter 2).
Engine difficult to start when hot
m
mAir filter element dirty or clogged (Chapter 1).
m mFuel injection system fault (Chapter 4).
m mLow cylinder compressions (Chapter 2).
Starter motor noisy or excessively-rough in
engagement
m mStarter pinion or flywheel/driveplate ring gear teeth loose or broken
(Chapters 2 or 5).
m mStarter motor mounting bolts loose or missing (Chapter 5).
m mStarter motor internal components worn or damaged (Chapter 5).
Engine starts, but stops immediately
m
mLoose or faulty electrical connections in the ignition circuit
(Chapters 1 and 5).
m mVacuum leak at the throttle body or inlet manifold (Chapter 4).
m mFuel injection system fault (Chapter 4).
Engine idles erratically
m
mCarburettor stepper motor plunger dirty (2.0 litre only) (Chapter 5)
m mIncorrectly-adjusted idle speed (Chapter 4).
m mAir filter element clogged (Chapter 1).
m mVacuum leak at the throttle body, inlet manifold or associated hoses
(Chapter 4).
m mWorn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m mUneven or low cylinder compressions (Chapter 2).
m mCamshaft lobes worn (Chapter 2).
m mFuel injection system fault (Chapter 4).
Engine misfires at idle speed
m
mWorn, faulty or incorrectly-gapped spark plugs (Chapter 1).
m mFaulty spark plug HT leads (Chapter 5).
m mVacuum leak at the throttle body, inlet manifold or associated hoses
(Chapter 4).
m mFuel injection system fault (Chapter 4).
m mDistributor cap cracked or tracking internally, where applicable
(Chapter 5).
m mUneven or low cylinder compressions (Chapter 2).
m mDisconnected, leaking, or perished crankcase ventilation hoses
(Chapter 4).
Fault Finding
spark plugs may only be pointers to some underlying fault.
The pages which follow provide an easy-reference guide to the more
common problems which may occur during the operation of the
vehicle. These problems and their possible causes are grouped under
headings denoting various components or systems, such as Engine,
Cooling system, etc. The Chapter and/or Section which deals with the
problem is also shown in brackets. Whatever the fault, certain basic
principles apply. These are as follows:
Verify the fault. This is simply a matter of being sure that you know
what the symptoms are before starting work. This is particularly
important if you are investigating a fault for someone else, who may
not have described it very accurately.
Don’t overlook the obvious. For example, if the vehicle won’t start, is
there fuel in the tank? (Don’t take anyone else’s word on this particular
point, and don’t trust the fuel gauge either!) If an electrical fault isindicated, look for loose or broken wires before digging out the test
gear.
Cure the disease, not the symptom. Substituting a flat battery with a
fully-charged one will get you off the hard shoulder, but if the
underlying cause is not attended to, the new battery will go the same
way. Similarly, changing oil-fouled spark plugs for a new set will get
you moving again, but remember that the reason for the fouling (if it
wasn’t simply an incorrect grade of plug) will have to be established
and corrected.
Don’t take anything for granted. Particularly, don’t forget that a
“new” component may itself be defective (especially if it’s been rattling
around in the boot for months), and don’t leave components out of a
fault diagnosis sequence just because they are new or recently-fitted.
When you do finally diagnose a difficult fault, you’ll probably realise
that all the evidence was there from the start.
1 Engine
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REF•8
Pedal travels to floor - no pressure or very little
resistance
m m
Badly stretched or broken cable (Chapter 6).m
mStripped pawl on pedal (Chapter 6).m
mBroken clutch release bearing or arm (Chapter 6).m
mBroken diaphragm spring in clutch pressure plate (Chapter 6).
Clutch fails to disengage (unable to select gears)
m m
Cable free play excessive (Chapter 6).m
mClutch driven plate sticking on gearbox input shaft splines (Chapter 6).m
mClutch driven plate sticking to flywheel or pressure plate (Chapter 6).m
mFaulty pressure plate assembly (Chapter 6).m
mClutch release mechanism worn or incorrectly assembled (Chapter 6).
Clutch slips (engine speed increases, with no
increase in vehicle speed)
m m
Clutch driven plate linings excessively worn (Chapter 6).m
mClutch driven plate linings contaminated with oil or grease (Chapter 6).m
mFaulty pressure plate or weak diaphragm spring (Chapter 6).
Judder as clutch is engaged
m m
Clutch driven plate linings contaminated with oil or grease (Chapter 6).m
mClutch driven plate linings excessively worn (Chapter 6).m
mFaulty or distorted pressure plate or diaphragm spring (Chapter 6).m
mWorn or loose engine or gearbox mountings (Chapter 2).m
mClutch driven plate hub or gearbox input shaft splines worn
(Chapter 6).
Noise when depressing or releasing clutch pedal
m m
Worn clutch release bearing (Chapter 6).m
mWorn or dry clutch pedal pivot (Chapter 6).m
mFaulty pressure plate assembly (Chapter 6).m
mPressure plate diaphragm spring broken (Chapter 6).m
mBroken clutch driven plate cushioning springs (Chapter 6).
Excessive fuel consumption
m
mAir filter element dirty or clogged (Chapter 1).
m mFuel injection system fault (Chapter 4).
m mIgnition timing incorrect or ignition system fault (Chapters 1 and 5).
m mBrakes binding (Chapter 10).
m mTyres under-inflated (Chapter 1).
Fuel leakage and/or fuel odour
m
mDamaged fuel tank, pipes or connections (Chapters 1 and 4).
Excessive noise or fumes from exhaust system
m
mLeaking exhaust system or manifold joints (Chapters 1 and 4).
m mLeaking, corroded or damaged silencers or pipe (Chapters 1 and 4).
m mBroken mountings causing body or suspension contact (Chapter 4).
Fault Finding
4Clutch
5Manual gearbox
Noisy in neutral with engine running
m m
Input shaft bearings worn (noise apparent with clutch pedal
released, but not when depressed) (Chapter 7A).*
m mClutch release bearing worn (noise apparent with clutch pedal
depressed, possibly less when released) (Chapter 6).
Noisy in one particular gear
m m
Worn, damaged or chipped gear teeth (Chapter 7A).*
Difficulty engaging gears
m m
Clutch fault (Chapter 6).m
mWorn or damaged gear linkage (Chapter 7A).m
mWorn synchroniser units (Chapter 7A).*
Jumps out of gear
m m
Worn or damaged gear linkage (Chapter 7A).m
mWorn synchroniser units (Chapter 7A).*m
mWorn selector forks (Chapter 7A).*
Vibration
m m
Lack of oil (Chapter 1).m
mWorn bearings (Chapter 7A).*
Lubricant leaks
m m
Leaking oil seal (Chapter 7A).m
mLeaking housing joint (Chapter 7A).*
*Although the corrective action necessary to remedy the symptoms
described is beyond the scope of the home mechanic, the above
information should be helpful in isolating the cause of the condition, so
that the owner can communicate clearly with a professional mechanic.
6Automatic transmission
Note:Due to the complexity of the automatic transmission, it is difficult
for the home mechanic to properly diagnose and service this unit. For
problems other than the following, the vehicle should be taken to a
dealer service department or automatic transmission specialist.
Fluid leakage
m m
Automatic transmission fluid is usually deep red in colour. Fluid
leaks should not be confused with engine oil, which can easily be
blown onto the transmission by air flow.
m mTo determine the source of a leak, first remove all built-up dirt and
grime from the transmission housing and surrounding areas, using a
degreasing agent or by steam-cleaning. Drive the vehicle at low speed,
so that air flow will not blow the leak far from its source. Raise and
support the vehicle, and determine where the leak is coming from. The
following are common areas of leakage:
a)Fluid pan ( transmission “sump”).
b)Dipstick tube (Chapter 1).
c)Transmission-to-fluid cooler fluid pipes/unions (Chapter 7B).
3Fuel and exhaust systems
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Transmission fluid brown, or has burned smell
m m
Transmission fluid level low, or fluid in need of renewal (Chapter 1).
General gear selection problems
m m
The most likely cause of gear selection problems is a faulty or
poorly-adjusted gear selector mechanism. The following are common
problems associated with a faulty selector mechanism:
a)Engine starting in gears other than Park or Neutral.
b)Indicator on gear selector lever pointing to a gear other than
the one actually being used.
c)Vehicle moves when in Park or Neutral.
d)Poor gear shift quality, or erratic gear changes.
m
mRefer any problems to a Ford dealer, or an automatic transmission
specialist.
Transmission will not downshift (kickdown) with
accelerator pedal fully depressed
m m
Low transmission fluid level (Chapter 1).
m
mIncorrect selector adjustment (Chapter 7B).
Engine will not start in any gear, or starts in gears
other than Park or Neutral
m m
Faulty starter inhibitor switch (Chapter 7B).
m
mIncorrect selector adjustment (Chapter 7B).
Transmission slips, shifts roughly, is noisy, or has no
drive in forward or reverse gears
m m
There are many probable causes for the above problems, but the
home mechanic should be concerned with only one possibility - fluid
level. Before taking the vehicle to a dealer or transmission specialist,
check the fluid level and condition of the fluid as described in Chapter 1.
Correct the fluid level as necessary, or change the fluid and filter if
needed. If the problem persists, professional help will be necessary.
REF•9Fault Finding
7Propeller shaft
Clunking or knocking noise when taking up drive
m m
Worn universal joints (Chapter 8).m
mLoose flange bolt (Chapter 8).
Vibration when accelerating or decelerating
m m
Worn centre bearing or universal joints (Chapter 8).m
mBent or distorted shaft (Chapter 8).m
mDeteriorated rubber insulator on centre bearing ( Chapter 8)
8Final drive and driveshafts
Excessive final drive noise
m m
Oil level low, or incorrect grade (Chapter 1)m
mWorn bearings (Chapter 9)m
mWorn or badly adjusted crownwheel and pinion (Chapter 9)m
mLoose or deteriorated final drive mountings (Chapter 9)
Oil leakage from final drive
m m
Pinion or output flange oil seal leaking (Chapter 9)
m
mRear cover leaking (Chapter 9)
m
mCover or casing cracked (Chapter 9)
Grating, knocking or vibration from driveshafts
m m
Flange screws loose (Chapter 9)
m
mCV joints worn (Chapter 9)
m
mDriveshaft bent (Chapter 9)
9Braking system
Note:Make sure that the tyres are in good condition and correctly
inflated, that the front wheel alignment is correct, and that the vehicle is
not loaded with weight in an unequal manner. Apart from checking the
condition of all pipe and hose connections, any faults occurring on the
anti-lock braking system should be referred to a Ford dealer for diagnosis.
Vehicle pulls to one side under braking
m m
Worn, defective, damaged or contaminated front or rear brake
pads on one side (Chapters 1 and 10).
m mSeized or partially-seized front or rear brake caliper piston (Chapter 10).m
mA mixture of brake pad lining materials fitted between sides
(Chapter 10).
m mBrake caliper mounting bolts loose (Chapter 10).m
mWorn or damaged steering or suspension components (Chapters 1
and 11).
Noise (grinding or high-pitched squeal) when brakes
applied
m m
Brake pad friction material worn down to metal backing (Chapters 1
and 10).
m mExcessive corrosion of brake disc - may be apparent after the
vehicle has been standing for some time (Chapters 1 and 10).
Excessive brake pedal travel
m m
Faulty master cylinder (Chapter 10).
m
mAir in hydraulic system (Chapter 10).
m
mFaulty vacuum servo unit (Chapter 10).
Brake pedal feels spongy when depressed
m m
Air in hydraulic system (Chapter 10).
m
mDeteriorated flexible rubber brake hoses (Chapters 1 and 10).
m
mMaster cylinder mountings loose (Chapter 10).
m
mFaulty master cylinder (Chapter 10).
Excessive brake pedal effort required to stop vehicle
m m
Faulty vacuum servo unit (Chapter 10).
m
mDisconnected, damaged or insecure brake servo vacuum hose
(Chapters 1 and 10).
m mPrimary or secondary hydraulic circuit failure (Chapter 10).
m
mSeized brake caliper piston(s) (Chapter 10).
m
mBrake pads incorrectly fitted (Chapter 10).
m
mIncorrect grade of brake pads fitted (Chapter 10).
m
mBrake pads contaminated (Chapter 10).
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Note:For problems associated with the starting system, refer to the
faults listed under “Engine” earlier in this Section.
Lights inoperative
m m
Bulb blown (Chapter 13).
m
mCorrosion of bulb or bulbholder contacts (Chapter 13).m
mBlown fuse (Chapter 13).m
mFaulty relay (Chapter 13).m
mBroken, loose, or disconnected wiring (Chapter 13).m
mFaulty switch (Chapter 13).
REF•10Fault Finding
Judder felt through brake pedal or steering wheel
when braking
m m
Excessive run-out or distortion of brake disc(s) (Chapter 10).m
mBrake pad linings worn (Chapters 1 and 10).m
mBrake caliper mounting bolts loose (Chapter 10).m
mWear in suspension or steering components or mountings
(Chapters 1 and 11).
Pedal pulsates when braking hard
m m
Normal feature of ABS - no fault
Brakes binding
m m
Seized brake caliper piston(s) (Chapter 10).
m
mIncorrectly-adjusted handbrake mechanism (Chapter 10).
m
mFaulty master cylinder (Chapter 10).
Rear wheels locking under normal braking
m m
Seized brake caliper piston(s) (Chapter 10).
m
mFaulty brake pressure regulator (Chapter 10).
10Steering and suspension
Note:Before diagnosing suspension or steering faults, be sure that the
trouble is not due to incorrect tyre pressures, mixtures of tyre types, or
binding brakes.
Vehicle pulls to one side
m m
Defective tyre (Chapter 1).m
mExcessive wear in suspension or steering components (Chapters 1
and 11).
m mIncorrect front wheel alignment (Chapter 11).m
mAccident damage to steering or suspension components (Chapters 1
and 11).
Wheel wobble and vibration
m m
Front roadwheels out of balance (vibration felt mainly through the
steering wheel) (Chapter 11).
m mRear roadwheels out of balance (vibration felt throughout the
vehicle) (Chapter 11).
m mRoadwheels damaged or distorted (Chapter 11).m
mFaulty or damaged tyre (Chapter 1).m
mWorn steering or suspension joints, bushes or components
(Chapters 1 and 11).
m mWheel bolts loose (Chapter 11).
Excessive pitching and/or rolling around corners, or
during braking
m m
Defective shock absorbers (Chapters 1 and 11).m
mBroken or weak coil spring and/or suspension component
(Chapters 1 and 11).
m mWorn or damaged anti-roll bar or mountings (Chapter 11).
Wandering or general instability
m m
Incorrect front wheel alignment (Chapter 11).m
mWorn steering or suspension joints, bushes or components
(Chapters 1 and 11).
m mRoadwheels out of balance (Chapter 11).m
mFaulty or damaged tyre (Chapter 1).m
mWheel bolts loose (Chapter 11).m
mDefective shock absorbers (Chapters 1 and 11).
Excessively-stiff steering
m m
Lack of steering gear lubricant (Chapter 11).m
mSeized track rod end balljoint or suspension balljoint (Chapters 1
and 11).
m mBroken or incorrectly adjusted auxiliary drivebelt (Chapter 1).m
mIncorrect front wheel alignment (Chapter 11).m
mSteering rack or column bent or damaged (Chapter 11).
Excessive play in steering
m m
Worn steering column universal joint(s) (Chapter 11).m
mWorn steering track rod end balljoints (Chapters 1 and 11).m
mWorn rack-and-pinion steering gear (Chapter 11).m
mWorn steering or suspension joints, bushes or components
(Chapters 1 and 11).
Lack of power assistance
m m
Broken or incorrectly-adjusted auxiliary drivebelt (Chapter 1).m
mIncorrect power steering fluid level (Chapter 1).m
mRestriction in power steering fluid hoses (Chapter 11).m
mFaulty power steering pump (Chapter 11).m
mFaulty rack-and-pinion steering gear (Chapter 11).
Tyre wear excessive
Tyres worn on inside or outside edges
m
mTyres under-inflated (wear on both edges) (Chapter 1).m
mIncorrect camber or castor angles (wear on one edge only)
(Chapter 11).
m mWorn steering or suspension joints, bushes or components
Chapters 1 and 11).
m mExcessively-hard cornering.m
mAccident damage.
Tyre treads exhibit feathered edges
m
mIncorrect toe setting (Chapter 11).
Tyres worn in centre of tread
m
mTyres over-inflated (Chapter 1).
Tyres worn on inside and outside edges
m
mTyres under-inflated (Chapter 1).m
mWorn shock absorbers (Chapters 1 and 11).
Tyres worn unevenly
m
mTyres out of balance (Chapter 1).m
mExcessive wheel or tyre run-out (Chapter 1).m
mWorn shock absorbers (Chapters 1 and 11).m
mFaulty tyre (Chapter 1).
11Electrical system
procarmanuals.com

REF•12Glossary of Technical Terms
A
ABS (Anti-lock brake system)A system,
usually electronically controlled, that senses
incipient wheel lockup during braking and
relieves hydraulic pressure at wheels that are
about to skid.
Air bag An inflatable bag hidden in the
steering wheel (driver’s side) or the dash or
glovebox (passenger side). In a head-on
collision, the bags inflate, preventing the
driver and front passenger from being thrown
forward into the steering wheel or windscreen.
Air cleanerA metal or plastic housing,
containing a filter element, which removes
dust and dirt from the air being drawn into the
engine.
Air filter elementThe actual filter in an air
cleaner system, usually manufactured from
pleated paper and requiring renewal at regular
intervals.
Allen keyA hexagonal wrench which fits into
a recessed hexagonal hole.
Alligator clipA long-nosed spring-loaded
metal clip with meshing teeth. Used to make
temporary electrical connections.
AlternatorA component in the electrical
system which converts mechanical energy
from a drivebelt into electrical energy to
charge the battery and to operate the starting
system, ignition system and electrical
accessories.
Ampere (amp)A unit of measurement for the
flow of electric current. One amp is the
amount of current produced by one volt
acting through a resistance of one ohm.
Anaerobic sealerA substance used to
prevent bolts and screws from loosening.
Anaerobic means that it does not require
oxygen for activation. The Loctite brand is
widely used.
AntifreezeA substance (usually ethylene
glycol) mixed with water, and added to a
vehicle’s cooling system, to prevent freezing
of the coolant in winter. Antifreeze also
contains chemicals to inhibit corrosion and
the formation of rust and other deposits that
would tend to clog the radiator and coolant
passages and reduce cooling efficiency.
Anti-seize compoundA coating that
reduces the risk of seizing on fasteners that
are subjected to high temperatures, such as
exhaust manifold bolts and nuts.
AsbestosA natural fibrous mineral with great
heat resistance, commonly used in the
composition of brake friction materials.Asbestos is a health hazard and the dust
created by brake systems should never be
inhaled or ingested.
AxleA shaft on which a wheel revolves, or
which revolves with a wheel. Also, a solid
beam that connects the two wheels at one
end of the vehicle. An axle which also
transmits power to the wheels is known as a
live axle.
AxleshaftA single rotating shaft, on either
side of the differential, which delivers power
from the final drive assembly to the drive
wheels. Also called a driveshaft or a halfshaft.
BBall bearingAn anti-friction bearing
consisting of a hardened inner and outer race
with hardened steel balls between two races.
BearingThe curved surface on a shaft or in a
bore, or the part assembled into either, that
permits relative motion between them with
minimum wear and friction.
Big-end bearingThe bearing in the end of
the connecting rod that’s attached to the
crankshaft.
Bleed nippleA valve on a brake wheel
cylinder, caliper or other hydraulic component
that is opened to purge the hydraulic system
of air. Also called a bleed screw.
Brake bleedingProcedure for removing air
from lines of a hydraulic brake system.
Brake discThe component of a disc brake
that rotates with the wheels.Brake drumThe component of a drum brake
that rotates with the wheels.
Brake liningsThe friction material which
contacts the brake disc or drum to retard the
vehicle’s speed. The linings are bonded or
riveted to the brake pads or shoes.
Brake padsThe replaceable friction pads
that pinch the brake disc when the brakes are
applied. Brake pads consist of a friction
material bonded or riveted to a rigid backing
plate.
Brake shoeThe crescent-shaped carrier to
which the brake linings are mounted and
which forces the lining against the rotating
drum during braking.
Braking systemsFor more information on
braking systems, consult the Haynes
Automotive Brake Manual.
Breaker barA long socket wrench handle
providing greater leverage.
BulkheadThe insulated partition between
the engine and the passenger compartment.
CCaliperThe non-rotating part of a disc-brake
assembly that straddles the disc and carries
the brake pads. The caliper also contains the
hydraulic components that cause the pads to
pinch the disc when the brakes are applied. A
caliper is also a measuring tool that can be set
to measure inside or outside dimensions of an
object.
CamshaftA rotating shaft on which a series
of cam lobes operate the valve mechanisms.
The camshaft may be driven by gears, by
sprockets and chain or by sprockets and a
belt.
CanisterA container in an evaporative
emission control system; contains activated
charcoal granules to trap vapours from the
fuel system.
CarburettorA device which mixes fuel with
air in the proper proportions to provide a
desired power output from a spark ignition
internal combustion engine.
CastellatedResembling the parapets along
the top of a castle wall. For example, a
castellated balljoint stud nut.
CastorIn wheel alignment, the backward or
forward tilt of the steering axis. Castor is
positive when the steering axis is inclined
rearward at the top.
Canister
Brake bleeding
Bearing
Air filter
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REF•13Glossary of Technical Terms
Catalytic converterA silencer-like device in
the exhaust system which converts certain
pollutants in the exhaust gases into less
harmful substances.
CirclipA ring-shaped clip used to prevent
endwise movement of cylindrical parts and
shafts. An internal circlip is installed in a
groove in a housing; an external circlip fits into
a groove on the outside of a cylindrical piece
such as a shaft.
ClearanceThe amount of space between
two parts. For example, between a piston and
a cylinder, between a bearing and a journal,
etc.
Coil springA spiral of elastic steel found in
various sizes throughout a vehicle, for
example as a springing medium in the
suspension and in the valve train.
CompressionReduction in volume, and
increase in pressure and temperature, of a
gas, caused by squeezing it into a smaller
space.
Compression ratioThe relationship between
cylinder volume when the piston is at top
dead centre and cylinder volume when the
piston is at bottom dead centre.
Constant velocity (CV) jointA type of
universal joint that cancels out vibrations
caused by driving power being transmitted
through an angle.
Core plugA disc or cup-shaped metal device
inserted in a hole in a casting through which
core was removed when the casting was
formed. Also known as a freeze plug or
expansion plug.
CrankcaseThe lower part of the engine
block in which the crankshaft rotates.
CrankshaftThe main rotating member, or
shaft, running the length of the crankcase,
with offset “throws” to which the connecting
rods are attached.
Crocodile clipSee Alligator clipDDiagnostic codeCode numbers obtained by
accessing the diagnostic mode of an engine
management computer. This code can be
used to determine the area in the system
where a malfunction may be located.
Disc brakeA brake design incorporating a
rotating disc onto which brake pads are
squeezed. The resulting friction converts the
energy of a moving vehicle into heat.
Double-overhead cam (DOHC)An engine
that uses two overhead camshafts, usually
one for the intake valves and one for the
exhaust valves.
Drivebelt(s)The belt(s) used to drive
accessories such as the alternator, water
pump, power steering pump, air conditioning
compressor, etc. off the crankshaft pulley.
DriveshaftAny shaft used to transmit
motion. Commonly used when referring to the
axleshafts on a front wheel drive vehicle.
Drum brakeA type of brake using a drum-
shaped metal cylinder attached to the inner
surface of the wheel. When the brake pedal is
pressed, curved brake shoes with friction
linings press against the inside of the drum to
slow or stop the vehicle.
EEGR valveA valve used to introduce exhaust
gases into the intake air stream.
Electronic control unit (ECU)A computer
which controls (for instance) ignition and fuel
injection systems, or an anti-lock braking
system. For more information refer to the
Haynes Automotive Electrical and Electronic
Systems Manual.
Electronic Fuel Injection (EFI)A computer
controlled fuel system that distributes fuel
through an injector located in each intake port
of the engine.
Emergency brakeA braking system,
independent of the main hydraulic system,
that can be used to slow or stop the vehicle if
the primary brakes fail, or to hold the vehicle
stationary even though the brake pedal isn’t
depressed. It usually consists of a hand lever
that actuates either front or rear brakes
mechanically through a series of cables and
linkages. Also known as a handbrake or
parking brake.EndfloatThe amount of lengthwise
movement between two parts. As applied to a
crankshaft, the distance that the crankshaft
can move forward and back in the cylinder
block.
Engine management system (EMS)A
computer controlled system which manages
the fuel injection and the ignition systems in
an integrated fashion.
Exhaust manifoldA part with several
passages through which exhaust gases leave
the engine combustion chambers and enter
the exhaust pipe.
F
Fan clutchA viscous (fluid) drive coupling
device which permits variable engine fan
speeds in relation to engine speeds.
Feeler bladeA thin strip or blade of hardened
steel, ground to an exact thickness, used to
check or measure clearances between parts.
Firing orderThe order in which the engine
cylinders fire, or deliver their power strokes,
beginning with the number one cylinder.
Flywheel A heavy spinning wheel in which
energy is absorbed and stored by means of
momentum. On cars, the flywheel is attached
to the crankshaft to smooth out firing
impulses.
Free playThe amount of travel before any
action takes place. The “looseness” in a
linkage, or an assembly of parts, between the
initial application of force and actual
movement. For example, the distance the
brake pedal moves before the pistons in the
master cylinder are actuated.
FuseAn electrical device which protects a
circuit against accidental overload. The typical
fuse contains a soft piece of metal which is
calibrated to melt at a predetermined current
flow (expressed as amps) and break the
circuit.
Fusible linkA circuit protection device
consisting of a conductor surrounded by
heat-resistant insulation. The conductor is
smaller than the wire it protects, so it acts as
the weakest link in the circuit. Unlike a blown
fuse, a failed fusible link must frequently be
cut from the wire for replacement.Catalytic converter
Crankshaft assembly
Accessory drivebelts
Feeler blade
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REF•14Glossary of Technical Terms
GGapThe distance the spark must travel in
jumping from the centre electrode to the side
electrode in a spark plug. Also refers to the
spacing between the points in a contact
breaker assembly in a conventional points-
type ignition, or to the distance between the
reluctor or rotor and the pickup coil in an
electronic ignition.
GasketAny thin, soft material - usually cork,
cardboard, asbestos or soft metal - installed
between two metal surfaces to ensure a good
seal. For instance, the cylinder head gasket
seals the joint between the block and the
cylinder head.
GaugeAn instrument panel display used to
monitor engine conditions. A gauge with a
movable pointer on a dial or a fixed scale is an
analogue gauge. A gauge with a numerical
readout is called a digital gauge.
HHalfshaftA rotating shaft that transmits
power from the final drive unit to a drive
wheel, usually when referring to a live rear
axle.
Harmonic balancerA device designed to
reduce torsion or twisting vibration in the
crankshaft. May be incorporated in the
crankshaft pulley. Also known as a vibration
damper.
HoneAn abrasive tool for correcting small
irregularities or differences in diameter in an
engine cylinder, brake cylinder, etc.
Hydraulic tappetA tappet that utilises
hydraulic pressure from the engine’s
lubrication system to maintain zero clearance
(constant contact with both camshaft and
valve stem). Automatically adjusts to variation
in valve stem length. Hydraulic tappets also
reduce valve noise.
IIgnition timingThe moment at which the
spark plug fires, usually expressed in the
number of crankshaft degrees before the
piston reaches the top of its stroke.
Inlet manifoldA tube or housing with
passages through which flows the air-fuel
mixture (carburettor vehicles and vehicles with
throttle body injection) or air only (port fuel-
injected vehicles) to the port openings in the
cylinder head.
JJump startStarting the engine of a vehicle
with a discharged or weak battery by
attaching jump leads from the weak battery to
a charged or helper battery.
LLoad Sensing Proportioning Valve (LSPV)A
brake hydraulic system control valve that
works like a proportioning valve, but also
takes into consideration the amount of weight
carried by the rear axle.
LocknutA nut used to lock an adjustment
nut, or other threaded component, in place.
For example, a locknut is employed to keep
the adjusting nut on the rocker arm in
position.
LockwasherA form of washer designed to
prevent an attaching nut from working loose.
MMacPherson strutA type of front
suspension system devised by Earle
MacPherson at Ford of England. In its original
form, a simple lateral link with the anti-roll bar
creates the lower control arm. A long strut - an
integral coil spring and shock absorber - is
mounted between the body and the steering
knuckle. Many modern so-called MacPherson
strut systems use a conventional lower A-arm
and don’t rely on the anti-roll bar for location.
MultimeterAn electrical test instrument with
the capability to measure voltage, current and
resistance.
NNOxOxides of Nitrogen. A common toxic
pollutant emitted by petrol and diesel engines
at higher temperatures.
OOhmThe unit of electrical resistance. One
volt applied to a resistance of one ohm will
produce a current of one amp.
OhmmeterAn instrument for measuring
electrical resistance.
O-ringA type of sealing ring made of a
special rubber-like material; in use, the O-ring
is compressed into a groove to provide the
sealing action.
Overhead cam (ohc) engineAn engine with
the camshaft(s) located on top of the cylinder
head(s).Overhead valve (ohv) engineAn engine with
the valves located in the cylinder head, but
with the camshaft located in the engine block.
Oxygen sensorA device installed in the
engine exhaust manifold, which senses the
oxygen content in the exhaust and converts
this information into an electric current. Also
called a Lambda sensor.
PPhillips screwA type of screw head having a
cross instead of a slot for a corresponding
type of screwdriver.
PlastigageA thin strip of plastic thread,
available in different sizes, used for measuring
clearances. For example, a strip of Plastigage
is laid across a bearing journal. The parts are
assembled and dismantled; the width of the
crushed strip indicates the clearance between
journal and bearing.
Propeller shaftThe long hollow tube with
universal joints at both ends that carries
power from the transmission to the differential
on front-engined rear wheel drive vehicles.
Proportioning valveA hydraulic control
valve which limits the amount of pressure to
the rear brakes during panic stops to prevent
wheel lock-up.
RRack-and-pinion steeringA steering system
with a pinion gear on the end of the steering
shaft that mates with a rack (think of a geared
wheel opened up and laid flat). When the
steering wheel is turned, the pinion turns,
moving the rack to the left or right. This
movement is transmitted through the track
rods to the steering arms at the wheels.
RadiatorA liquid-to-air heat transfer device
designed to reduce the temperature of the
coolant in an internal combustion engine
cooling system.
RefrigerantAny substance used as a heat
transfer agent in an air-conditioning system.
R-12 has been the principle refrigerant for
many years; recently, however, manufacturers
have begun using R-134a, a non-CFC
substance that is considered less harmful to
the ozone in the upper atmosphere.
Rocker armA lever arm that rocks on a shaft
or pivots on a stud. In an overhead valve
engine, the rocker arm converts the upward
movement of the pushrod into a downward
movement to open a valve.
Adjusting spark plug gap
Plastigage
Gasket
procarmanuals.com

REF•15Glossary of Technical Terms
RotorIn a distributor, the rotating device
inside the cap that connects the centre
electrode and the outer terminals as it turns,
distributing the high voltage from the coil
secondary winding to the proper spark plug.
Also, that part of an alternator which rotates
inside the stator. Also, the rotating assembly
of a turbocharger, including the compressor
wheel, shaft and turbine wheel.
RunoutThe amount of wobble (in-and-out
movement) of a gear or wheel as it’s rotated.
The amount a shaft rotates “out-of-true.” The
out-of-round condition of a rotating part.
SSealantA liquid or paste used to prevent
leakage at a joint. Sometimes used in
conjunction with a gasket.
Sealed beam lampAn older headlight design
which integrates the reflector, lens and
filaments into a hermetically-sealed one-piece
unit. When a filament burns out or the lens
cracks, the entire unit is simply replaced.
Serpentine drivebeltA single, long, wide
accessory drivebelt that’s used on some
newer vehicles to drive all the accessories,
instead of a series of smaller, shorter belts.
Serpentine drivebelts are usually tensioned by
an automatic tensioner.
ShimThin spacer, commonly used to adjust
the clearance or relative positions between
two parts. For example, shims inserted into or
under bucket tappets control valve
clearances. Clearance is adjusted by
changing the thickness of the shim.
Slide hammerA special puller that screws
into or hooks onto a component such as a
shaft or bearing; a heavy sliding handle on the
shaft bottoms against the end of the shaft to
knock the component free.SprocketA tooth or projection on the
periphery of a wheel, shaped to engage with a
chain or drivebelt. Commonly used to refer to
the sprocket wheel itself.
Starter inhibitor switchOn vehicles with an
automatic transmission, a switch that
prevents starting if the vehicle is not in Neutral
or Park.
StrutSee MacPherson strut.
TTappetA cylindrical component which
transmits motion from the cam to the valve
stem, either directly or via a pushrod and
rocker arm. Also called a cam follower.
ThermostatA heat-controlled valve that
regulates the flow of coolant between the
cylinder block and the radiator, so maintaining
optimum engine operating temperature. A
thermostat is also used in some air cleaners in
which the temperature is regulated.
Thrust bearingThe bearing in the clutch
assembly that is moved in to the release
levers by clutch pedal action to disengage the
clutch. Also referred to as a release bearing.
Timing beltA toothed belt which drives the
camshaft. Serious engine damage may result
if it breaks in service.
Timing chainA chain which drives the
camshaft.
Toe-inThe amount the front wheels are
closer together at the front than at the rear. On
rear wheel drive vehicles, a slight amount of
toe-in is usually specified to keep the front
wheels running parallel on the road by
offsetting other forces that tend to spread the
wheels apart.
Toe-outThe amount the front wheels are
closer together at the rear than at the front. On
front wheel drive vehicles, a slight amount of
toe-out is usually specified.
ToolsFor full information on choosing and
using tools, refer to the Haynes Automotive
Tools Manual.
TracerA stripe of a second colour applied to
a wire insulator to distinguish that wire from
another one with the same colour insulator.
Tune-upA process of accurate and careful
adjustments and parts replacement to obtain
the best possible engine performance.TurbochargerA centrifugal device, driven by
exhaust gases, that pressurises the intake air.
Normally used to increase the power output
from a given engine displacement, but can
also be used primarily to reduce exhaust
emissions (as on VW’s “Umwelt” Diesel
engine).
UUniversal joint or U-jointA double-pivoted
connection for transmitting power from a
driving to a driven shaft through an angle. A
U-joint consists of two Y-shaped yokes and a
cross-shaped member called the spider.
VValveA device through which the flow of
liquid, gas, vacuum, or loose material in bulk
may be started, stopped, or regulated by a
movable part that opens, shuts, or partially
obstructs one or more ports or passageways.
A valve is also the movable part of such a
device.
Valve clearanceThe clearance between the
valve tip (the end of the valve stem) and the
rocker arm or tappet. The valve clearance is
measured when the valve is closed.
Vernier caliperA precision measuring
instrument that measures inside and outside
dimensions. Not quite as accurate as a
micrometer, but more convenient.
ViscosityThe thickness of a liquid or its
resistance to flow.
VoltA unit for expressing electrical
“pressure” in a circuit. One volt that will
produce a current of one ampere through a
resistance of one ohm.
WWeldingVarious processes used to join metal
items by heating the areas to be joined to a
molten state and fusing them together. For
more information refer to the Haynes
Automotive Welding Manual.
Wiring diagramA drawing portraying the
components and wires in a vehicle’s electrical
system, using standardised symbols. For
more information refer to the Haynes
Automotive Electrical and Electronic Systems
Manual.
Serpentine drivebelt
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