wheel size FORD SIERRA 1986 1.G SOHC Engines Workshop Manual

1.3 litre engine
General
Engine type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Four-cylinder, in-line, single overhead camshaft
Firing order . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3-4-2
Engine code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . JCT
Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.02 mm
Stroke . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66.00 mm
Cubic capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1294 cc
Compression ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0:1
Compression pressure at starter motor speed . . . . . . . . . . . . . . . . . . . . 11 to 13 bar
Maximum continuous engine speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5800 rpm
Maximum engine power (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44 kW at 5700 rpm
Maximum engine torque (DIN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 98 Nm at 3100 rpm
Cylinder bore diameter
Standard class 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.000 to 79.010 mm
Standard class 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.010 to 79.020 mm
Standard class 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.020 to 79.030 mm
Standard class 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.030 to 79.040 mm
Oversize class A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.510 to 79.520 mm
Oversize class B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.520 to 79.530 mm
Oversize class C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.530 to 79.540 mm
Standard service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.030 to 79.040 mm
Oversize 0.5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79.530 to 79.540 mm
Oversize 1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80.030 to 80.040 mm
Chapter 2 Part A:
SOHC engines
Auxiliary shaft - removal, inspection and refitting . . . . . . . . . . . . . . .25
Camshaft and cam followers - removal, inspection and refitting . . . .24
Compression test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
Crankcase ventilation system - inspection and maintenance . . . . . . .4
Crankshaft and bearings - examination and renovation . . . . . . . . . .35
Crankshaft and main bearings - removal and refitting . . . . . . . . . . . .34
Crankshaft front oil seal - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . .27
Crankshaft rear oil seal - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . .28
Cylinder block and bores - examination and renovation . . . . . . . . . .36
Cylinder head - dismantling and reassembly . . . . . . . . . . . . . . . . . . .22
Cylinder head - inspection and renovation . . . . . . . . . . . . . . . . . . . . .23
Cylinder head - removal and refitting (engine in vehicle) . . . . . . . . . .20
Cylinder head - removal and refitting (engine removed) . . . . . . . . . . .21
Engine - refitting (automatic transmission in vehicle) . . . . . . . . . . . . .14
Engine - refitting (manual gearbox in vehicle) . . . . . . . . . . . . . . . . . . .13
Engine - removal leaving automatic transmission in vehicle . . . . . . .10
Engine - removal leaving manual gearbox in vehicle . . . . . . . . . . . . . .9
Engine/automatic transmission assembly - reconnection and
refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
Engine/automatic transmission assembly - removal and separation .12Engine dismantling,examination, renovation and reassembly - general
information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Engine/manual gearbox - reconnection and refitting . . . . . . . . . . . . .15
Engine/manual gearbox assembly - removal and separation . . . . . .11
Engine mountings - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
Engine oil and filter - renewal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2
Flywheel/driveplate - removal, inspection and refitting . . . . . . . . . . .26
General information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Initial start-up after overhaul or major repair . . . . . . . . . . . . . . . . . . .37
Major operations possible with the engine in the vehicle . . . . . . . . . . .6
Major operations requiring engine removal . . . . . . . . . . . . . . . . . . . . .7
Method of engine removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
Oil pump - dismantling, inspection and reassembly . . . . . . . . . . . . .31
Oil pump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
Pistons and connecting rods - examination and renovation . . . . . . .33
Pistons and connecting rods - removal and refitting . . . . . . . . . . . . .32
Sump - removal and refitting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .29
Timing belt and sprockets - removal and refitting . . . . . . . . . . . . . . .19
Valve clearances - checking and adjustment . . . . . . . . . . . . . . . . . . . .3
2A¥1
Specifications Contents
2A
Easy,suitable for
novice with little
experienceFairly easy,suitable
for beginner with
some experienceFairly difficult,
suitable for competent
DIY mechanic
Difficult,suitable for
experienced DIY
mechanicVery difficult,
suitable for expert
DIY or professional
Degrees of difficulty

Inlet valve stem diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.025 to 8.043 mm
Oversize 0.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.225 to 8.243 mm
Oversize 0.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.425 to 8.443 mm
Oversize 0.6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.625 to 8.643 mm
Oversize 0.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.825 to 8.843 mm
Exhaust valve stem diameter:
Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7.999 to 8.017 mm
Oversize 0.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.199 to 8.217 mm
Oversize 0.4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.399 to 8.417 mm
Oversize 0.6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.599 to 8.617 mm
Oversize 0.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8.799 to 8.817 mm
Lubrication system
Oil type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Multigrade engine oil, viscosity range SAE 10W/30 to 20W/50 to API
SG/CD or better
Oil capacity:
With filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.75 litres (6.6 pints)
Without filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3.25 litres (5.7 pints)
Oil filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Champion C102
Oil pump clearances:
Outer rotor to body . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.153 to 0.304 mm (0.006 to 0.012 in)
Inner rotor to outer rotor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.050 to 0.200 mm (0.002 to 0.008 in)
Rotor endfloat . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0.039 to 0.104 mm (0.002 to 0.004 in)
Torque wrench settingsNmlbf ft
Main bearing cap bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88 to 10265 to 75
Big-end bearing cap nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 to 4730 to 35
Crankshaft pulley bolt:
Strength class 8.8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .55 to 6041 to 44
Strength class 10.9 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .100 to 11574 to 85
Camshaft sprocket bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 to 5033 to 37
Auxiliary shaft sprocket bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 to 5033 to 37
Flywheel bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 to 7047 to 52
Oil pump bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 to 2113 to 15
Oil pump cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9 to 137 to 10
Sump bolts:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1 to 20.7 to 1.5
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 84 to 6
Stage 3 (after running engine for 20 minutes) . . . . . . . . . . . . . . . . . . .8 to 106 to 7
Sump drain plug . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21 to 2815 to 21
Oil pressure warning lamp switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12 to 159 to 11
Valve adjustment ball-pin locknuts:
7 mm thick nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .45 to 5033 to 37
8 mm thick nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 to 5537 to 41
Cylinder head bolts:
Splined type bolts:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40 to 5530 to 41
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50 to 7037 to 52
Stage 3 (after 20 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .73 to 8354 to 61
Stage 4 (after running engine for 15 minutes at 1000 rpm) . . . . . .95 to 11570 to 85
Torx type bolts:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35 to 4026 to 30
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .70 to 7552 to 55
Stage 3 (after 5 minutes) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tighten through a further 90¼
Camshaft cover bolts:
Stage 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 84 to 6
Stage 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2 to 31.5 to 2
Stage 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 84 to 6
Stage 4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 to 84 to 6
Timing cover bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13 to 1710 to 13
Timing belt tensioner bolts:
Models with tensioner spring:
Spring bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17 to 2113 to 15
Pivot bolt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
Models without tensioner spring . . . . . . . . . . . . . . . . . . . . . . . . . . . .20 to 2515 to 18
Oil pick-up tube/strainer-to-oil pump bolts . . . . . . . . . . . . . . . . . . . . . .11 to 148 to 10
Oil pick-up tube/strainer-to-cylinder block bolts . . . . . . . . . . . . . . . . . .17 to 2113 to 15
SOHC engines 2A¥3
2A

components, but there must be no tight spots
or binding.
28Check that the crankshaft endfloat is
within the specified limits by inserting a feeler
blade between the centre crankshaft web and
the thrustwashers.
29Make sure that the rear oil seal is fully
located onto its seating. Coat the rear main
bearing cap sealing wedges with sealing
compound, then press them into position
using a blunt screwdriver with the rounded
red face towards the cap (see illustration).
30Refit the oil pump and pick-up tube.
31Refit the crankshaft front oil seal housing
and the auxiliary shaft front cover using a new
gasket, and tighten the securing bolts. Smear
the lip of the oil seal with clean engine oil
before fitting; and using a straight edge, ensure
that the bottom face of the oil seal housing is
aligned with the bottom face of the cylinder
block before finally tightening the bolts.
32Refit the pistons and connecting rods.
33Refit the flywheel/driveplate and the
auxiliary shaft sprocket, crankshaft sprocket,
and timing belt.
1Examine the bearing surfaces of the
crankshaft for scratches or scoring and, using
a micrometer, check each journal and
crankpin for ovality. Where this is found to be
in excess of 0.0254 mm (0.001 in) the
crankshaft will have to be reground and
undersize bearings fitted.
2Crankshaft regrinding should be carried out
by a suitable engineering works, who will
normally supply the matching undersize main
and big-end shell bearings.
3Note that undersize bearings may already
have been fitted, either in production or by a
previous repairer. Check the markings on the
backs of the old bearing shells, and if in doubt
take them along when buying new ones.
Production undersizes are also indicated by
paint marks as follows:
White line on main bearing cap - parent bore
0.40 mm oversize
Green line on crankshaft front counterweight
- main bearing journals 0.25 mm
undersize
Green spot on counterweight - big-end
bearing journals 0.25 mm undersize4If the crankshaft endfloat is more than the
maximum specified amount, new
thrustwashers should be fitted to the centre
main bearings. These are usually supplied
together with the main and big-end bearings
on a reground crankshaft.
5An accurate method of determining bearing
wear is by the use of Plastigage. The
crankshaft is located in the main bearings
(and big-end bearings if necessary) and the
Plastigage filament located across the journal
which must be dry. The cap is then fitted and
the bolts/nuts tightened to the specified
torque. On removal of the cap the width of the
filaments is checked against a scale which
shows the bearing running clearance. This
clearance is then compared with that given in
the Specifications (see illustration).
6If the spigot bearing in the rear of the
crankshaft requires renewal, extract it with a
suitable puller. Alternatively fill it with heavy
grease and use a close fitting metal dowel
driven into the centre of the bearing. Drive the
new bearing into the crankshaft with a soft
metal drift.
1The cylinder bores must be examined for
taper, ovality, scoring and scratches. Start by
examining the top of the bores; if these are
worn, a slight ridge will be found which marks
the top of the piston ring travel. If the wear is
excessive, the engine will have had a high oil
consumption rate accompanied by blue
smoke from the exhaust.
2If available, use an inside dial gauge to
measure the bore diameter just below the
ridge and compare it with the diameter at the
bottom of the bore, which is not subject to
wear. If the difference is more than 0.152 mm
(0.006 in), the cylinders will normally require
reboring with new oversize pistons fitted.
3Proprietary oil control rings can be obtained
for fitting to the existing pistons if it is felt that
the degree of wear does not justify a rebore.
However, any improvement brought about by
such rings may be short-lived.
4If new pistons or piston rings are to be fitted
to old bores, deglaze the bores with abrasive
paper or a Òglaze busterÓ tool. The object is to
produce a light cross-hatch pattern to assistthe new rings to bed in.
5If there is a ridge at the top of the bore and
new piston rings are being fitted, either the
top piston ring must be stepped (Òridge
dodgerÓ pattern) or the ridge must be
removed with a ridge reamer. If the ridge is
left, the piston ring may hit it and break.
6Thoroughly examine the crankcase and
cylinder block for cracks and damage and use
a piece of wire to probe all oilways and
waterways to ensurethatthey are
unobstructed.
1Make a final check to ensure that
everything has been reconnected to the
engine and that no rags or tools have been left
in the engine bay.
2Check that oil and coolant levels are
correct.
3Start the engine. This may take a little
longer than usual as fuel is pumped up to the
engine.
4Check that the oil pressure light goes out
when the engine starts.
5Run the engine at a fast tickover and check
for leaks of oil, fuel or coolant. Also check
power steering and transmission fluid cooler
unions, where applicable. Some smoke and
odd smells may be experienced as assembly
lubricant burns off the exhaust manifold and
other components.
6Bring the engine to normal operating
temperature, then check the ignition timing
and the idle speed (where applicable) and
mixture.
7If splined type cylinder head bolts have
been used, stop the engine after it has been
running for 15 minutes, then remove the
crankshaft cover and tighten the cylinder
head bolts to the fourth stage given in the
Specifications, in the correct order.
8When the engine has completely cooled,
re-check the oil and coolant levels, and
check, and if necessary adjust, the valve
clearances.
9If new bearings, pistons etc have been
fitted, the engine should be run-in at reduced
speeds and loads for the first 500 miles (800
km) or so. It is beneficial to change the engine
oil and filter after this mileage.
37Initial start-up after overhaul or
major repair
36Cylinder block and bores -
examination and renovation35Crankshaft and bearings -
examination and renovation
2A¥24SOHC engines
34.24 Fitting a thrustwasher to the centre
main bearing cap35.5 Checking the width of the filament
against the scale of the packet34.29 Fitting a sealing wedge to the rear
main bearing cap