1992 FORD SIERRA engine

Note: A new camshaft oil seal should be used
when refitting the camshaft.
Removal
1Remove the cylinder head.
2Hold the camshaft stationary using a
suitable spanner on the cast boss behind the
No 6 valve cam, and unscrew the camshaft
sprocket bolt and washer.
3Remove the camshaft sprocket, using a
suitable puller if necessary, and withdraw the
sprocket backplate, noting which way round it
is fitted.
4Remove the three securing bolts andwithdraw the camshaft oil supply tube (see
illustration).
5Note how the cam follower retaining
springs are fitted, then unhook them from the
cam followers (see illustration).
6Loosen the locknuts and back off the ball-
pin adjuster nuts until the cam followers can
be removed (see illustration). Note their
locations for use when refitting. It will be
necessary to rotate the camshaft during this
operation.
7Unscrew the two bolts and remove the
camshaft thrustplate from the rear bearing
housing (see illustration).
8Carefully withdraw the camshaft from the
rear of the cylinder head taking care not to
damage the bearings (see illustration).
9Prise the oil seal from the front bearing in
the cylinder head (see illustration).
Inspection
10Examine the surfaces of the camshaft
journals and lobes, and the cam followers for
wear. If wear is excessive, considerable noise
would have been noticed from the top of the
engine when running, and a new camshaft
and followers must be fitted.
11Check the camshaft bearings for wear,
and if necessary have them renewed by a
Ford dealer.
12Check the camshaft oil supply tube for
obstructions, making sure the jet holes are clear.
Refitting
13Commence refitting by driving a new oil
seal into the cylinder head front bearing, usinga suitable tube drift or socket(see
illustration).Smear the seal lip with clean
engine oil.
14Lubricate the camshaft, bearings and
thrustplate with SAE 80/90 hypoid oil, then
carefully insert the camshaft from the rear of
the cylinder head, taking care not to damage
the bearings.
15Locate the thrustplate in the camshaft
groove, then insert and tighten the bolts.
16Using a dial test indicator if available, or
feelerblades, check that the camshaft
endfloat is within the limits given in the
Specifications. If not, renew the thrustplate
and re-check. If this does not bring the
endfloat within limits, the camshaft must be
renewed.
17Lubricate the ball-pins with SAE 80/90
hypoid oil, then refit the cam followers to their
original locations, and refit the retaining
springs as noted during removal. It will be
necessary to rotate the camshaft during this
operation.
18Fit the oil supply tube and tighten the
bolts.
19Fit the camshaft sprocket backplate, as
noted during removal.
20Fit the camshaft sprocket, then insert and
tighten the bolt (with washer in place) to the
specified torque, holding the camshaft
stationary as described in paragraph 2.
21With the cylinder head supported on
blocks of wood, adjust the valve clearances.
This work is easier to carry out on the bench
rather than in the vehicle.
22Refit the cylinder head.
24Camshaft and cam followers
- removal, inspection and
refitting
SOHC engines 2A¥17
2A
24.6 Removing a cam follower
24.13 Fitting a new camshaft oil seal using
a socket24.9 Prising out the camshaft oil seal24.8 Withdrawing the camshaft
24.7 Unscrew the securing bolts and
remove the camshaft thrustplate
24.5 Note how the cam follower retaining
springs are fitted24.4 Withdrawing the camshaft oil supply
tube

Note: A new gasket should be used when
refitting the auxiliary shaft cover (see text).
Removal
1Remove the timing belt and the auxiliary
shaft sprocket.
2Remove the distributor.
3Remove the mechanical fuel pump and
operating pushrod (where applicable).
4Unscrew the three securing bolts and
remove the auxiliary shaft cover (see
illustration).
5Unscrew the cross-head screws, using an
impact screwdriver if necessary, remove the
thrustplate and withdraw the auxiliary shaft
from the cylinder block (see illustrations).
6Cut the cover gasket along the top of the
crankshaft front oil seal housing and scrape
off the gasket.
Inspection
7Examine the shaft for wear and damage,
and renew it if necessary.
8If desired, the oil seal in the cover can be
renewed as follows.
9Support the cover on blocks of wood and
drive out the old oil seal. Drive the new seal
into place using a suitable metal tube or
socket (see illustrations). The sealing lip
must face towards the cylinder block. Smear
the sealing lip with clean engine oil before
installation.
Refitting
10Commence refitting by lubricating the
auxiliary shaft journals with clean engine oil,
then insert the shaft into the cylinder block.
11Locate the thrustplate in the shaft groove,
then insert the crosshead screws and tighten
them with an impact screwdriver.
12Using a dial test indicator (if available), or
feelerblades, check that the auxiliary shaft
endfloat is within the limits given in the
Specifications. If not, renew the thrustplate
and re-check. If this does not bring the
endfloat within limits, the auxiliary shaft must
be renewed.
13Cut out the relevant section of a new
gasket, and locate it on the cylinder block,
then refit the auxiliary shaft cover and tighten
the securing bolts.
14Where applicable, refit the fuel pump.
15Refit the distributor.
16Refit the auxiliary shaft sprocket and the
timing belt.
Note: The manufacturers recommend that the
flywheel/driveplate securing bolts are renewed
after slackening. Suitable thread-locking agent
will be required to coat the bolt threads.
Removal
1If the engine is in the vehicle, remove the
clutch or the automatic transmission, as
applicable.2Prevent the flywheel/driveplate from turning
by jamming the ring gear teeth or by bolting a
strap between the flywheel/driveplate and the
cylinder block.
3Make alignment marks on the
flywheel/driveplate and the end of the
crankshaft, so that the flywheel/driveplate can
be refitted in its original position.
4Unscrew the securing bolts and withdraw
the flywheel/driveplate. Do not drop it, it is
very heavy. Note that on models with A4LD
type automatic transmission, the driveplate
may be secured with one or two reinforcing
plates depending on model.
5The engine adapter plate may now be
withdrawn from the dowels if required (see
illustration).
Inspection
6With the flywheel/driveplate removed, the
ring gear can be examined for wear and
damage.
7If the ring gear is badly worn or has missing
teeth it should be renewed. The old ring can
be removed from the flywheel/driveplate by
cutting a notch between two teeth with a
hacksaw and then splitting it with a cold
chisel. Wear eye protection when doing this.
8Fitting of a new ring gear requires heating
the ring to 400¼F (204¼C). This can be done by
polishing four equally spaced sections of the
gear, laying it on a heat resistant surface (such
as fire bricks) and heating it evenly with a blow
lamp or torch until the polished areas turn a
light yellow tinge. Do not overheat, or the hard
wearing properties will be lost. The gear has a
26Flywheel/driveplate - removal,
inspection and refitting
25Auxiliary shaft - removal,
inspection and refitting
2A¥18SOHC engines
25.4 Unscrew the auxiliary shaft cover
securing bolts and remove the cover25.5b Withdraw the auxiliary shaft
26.5 Withdrawing the engine adaptor plate25.9b Using a socket to fit a new auxiliary
shaft cover oil seal25.9a Driving out the auxiliary shaft cover
oil seal
25.5a Unscrew the auxiliary shaft
thrustplate securing screws and remove
the thrustplate

chamfered inner edge which should fit against
the shoulder on the flywheel. When hot
enough, place the gear in position quickly,
tapping it home if necessary, and let it cool
naturally without quenching in any way.
Refitting
9Commence refitting of the
flywheel/driveplate by refitting the engine
adapter plate to the dowels on the rear of the
cylinder block, where applicable.
10Ensure that the mating faces are clean,
then locate the flywheel/driveplate on the rear
of the crankshaft, aligning the previously
made marks (see illustration).
11Coat the threads of the securing bolts
with a liquid thread-locking agent, then insert
the bolts. Note that the manufacturers rec-
ommend the use of new bolts. Where
applicable refit the reinforcing plate(s) on
models with A4LD type automatics12Prevent the flywheel/driveplate from
turning as described in paragraph 2, then
tighten the securing bolts to the specified
torque in a diagonal sequence (see
illustration).
13If the engine is in the vehicle, refit the
clutch or the automatic transmission, as
applicable.
Note: A new gasket will be required for
refitting if the old seal housing is removed
during this procedure.
1Remove the timing belt and the crankshaft
sprocket.
2If an oil seal removal tool is available, the oil
seal can be removed at this stage. It may also
be possible to remove the oil seal by drillingthe outer face and using self-tapping screws
and a pair of grips.
3If the oil seal cannot be removed as
described in paragraph 2, remove the sump
and the auxiliary shaft sprocket, then unbolt
the oil seal housing and the auxiliary shaft
front cover. Recover the gasket. The oil seal
can then be driven out from the inside of the
housing (see illustrations).
4Clean the oil seal housing, then drive in a
new seal using a suitable metal tube or
socket. Make sure that the seal lip faces into
the engine and lightly smear the lip with clean
engine oil (see illustration).
5Where applicable, refit the oil seal housing
and the auxiliary shaft front cover, using a
new gasket, and tighten the bolts. 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 (see illustrations). Refit
the auxiliary shaft sprocket and refit the sump.
6Refit the crankshaft sprocket and timing
belt.
1Remove the flywheel/driveplate and the
engine adapter plate.
2Extract the oil seal using an oil seal removal
tool if available. It may also be possible to
remove the oil seal by drilling the outer face
and using self-tapping screws and a pair of
grips (see illustration).
28Crankshaft rear oil seal -
renewal27Crankshaft front oil seal -
renewal
SOHC engines 2A¥19
2A
27.3a Removing the crankshaft front oil
seal housing27.3b Driving the crankshaft front oil seal
from the housing
28.2 Crankshaft rear oil seal location
(arrowed)27.5b Checking the alignment of the
crankshaft front oil seal housing27.5a Crankshaft front oil seal
housing/auxiliary shaft cover gasket
located on front of cylinder block
27.4 Using a socket to fit a new crankshaft
front oil seal
26.12 Use a strap to prevent the flywheel
turning as its securing bolts are tightened26.10 Flywheel located on crankshaft

3Clean the oil seal housing, then drive in a
new seal using a suitable metal tube or
socket. Make sure that the seal lip faces into
the engine and lightly smear the lip with clean
engine oil.
4Refit the engine adapter plate and the
flywheel/driveplate.
Note: New gaskets and sealing strips will be
required for refitting, and sealing compound
will be required to coat the gasket faces.
Removal
1If the engine is in the vehicle, proceed as
follows, otherwise proceed to paragraph 12.
2Disconnect the battery negative lead.3Apply the handbrake, jack up the front of
the vehicle and support on axle stands (see
ÒJacking and Vehicle SupportÓ).
4Drain the engine oil into a container.
5Remove the starter motor, if necessary.
6Unscrew the nuts or bolts, as applicable,
securing the engine mountings to the
crossmember.
7Working in the engine compartment,
unscrew the bolt securing the intermediate
shaft to the steering column, swivel the clamp
plate to one side, and disconnect the
intermediate shaft.
8Where applicable, detach the brake lines
from the crossmember.
9Support the engine using a hoist, or a bar
and blocks of wood resting on the suspension
turrets (see illustrations). Attach the lifting
tackle to the engine lifting brackets on the
cylinder head. If using a support bar, the
engine may be lifted slightly by using the baras a lever before resting it on the wooden
blocks.
10Support the front crossmember with a
trolley jack, then unscrew the bolts securing
the crossmember to the underbody (see
illustration).
11Lower the crossmember just enough to
give sufficient clearance to remove the sump
(see illustrations).
12Unscrew the twenty-three securing bolts
and withdraw the sump (see illustration). If
the sump is stuck, carefully tap it sideways to
free it. Do not prise between the mating faces.
Note that if the engine has been removed, it is
preferable to keep the engine upright until the
sump has been removed to prevent sludge
from entering the engine internals.
13Recover the gaskets and sealing strips.
14Thoroughly clean the mating faces of the
cylinder block and sump.
Refitting
15Commence refitting by applying sealing
compound (available from a Ford dealer) to
the corners of the front and rear rubber
sealing strip locations in the cylinder block,
then press the sealing strips into the grooves
in the rear main bearing cap and the
crankshaft front oil seal housing (see
illustrations).
16Apply a little sealing compound to the
mating face of the cylinder block, then place
the sump gaskets in position, ensuring that
the end tabs locate correctly beneath the
rubber sealing strips (see illustration).
17Locate the sump on the gaskets and
loosely fit the securing bolts.
29Sump - removal and refitting
2A¥20SOHC engines
29.9a Make up wooden blocks to fit the
front suspension turrets and support a
metal bar . . .29.10 Unscrew the front crossmember
securing bolts
29.15b . . . then fit the rubber sealing strips29.15a Apply sealing compound . . .29.12 Unscrew the securing bolts and
withdraw the sump
29.11b . . . to give sufficient clearance for
sump removal29.11a Lower the suspension . . .
29.9b . . . which will support the engine

18Tighten the bolts in the correct sequence
(see illustration)noting the two stages given
in the Specifications. Tighten to the first stage
in a clockwise sequence starting at point ÒAÓ,
then tighten to the second stage in a
clockwise sequence starting at point ÒBÓ.
Tighten to the third stage after the engine has
been running for twenty minutes.
19If the engine is in the vehicle proceed as
follows.
20Carefully lift the crossmember with the
jack, then refit the securing bolts and tighten
to the specified torque.
21Withdraw the jack, then lower the engine
and remove the lifting tackle.
22Where applicable, refit the brake lines to
the crossmember.
23Ensure that the front wheels are pointing
straight ahead and that the steering wheel is
centred, then reconnect the intermediate shaft
to the steering column. Secure the clamp
plate with the bolt.
24Refit the engine mounting bolts andtighten to the specified torque.
25Refit the starter motor.
26Lower the vehicle to the ground.
27Ensure that the sump drain plug is fitted,
then fill the engine with the correct quantity
and grade of oil. If necessary, renew the oil
filter before filling the engine with oil.
28Reconnect the battery negative lead.
29Start the engine and check for leaks
around the sump, and where applicable the oil
filter. When the engine is started, there may
be a delay in the extinguishing of the oil
pressure warning lamp while the system
pressurises.
30Run the engine for twenty minutes then
stop the engine and tighten the sump bolts to
the third stage given in the Specifications,
starting at the point ÒAÓ shown and working
clockwise.
31Check the oil level.
32Dispose of any old engine oil safely. Do
not pour it down a drain - this is illegal and
causes pollution.
Removal
1Remove the sump.
2Unscrew the bolt securing the pick-up tube
and strainer to the cylinder block (see
illustration).
3Using a suitable splined socket, unscrew
the two securing bolts and withdraw the oil
pump and strainer (see illustration).
4If desired, the hexagon-shaped driveshaft
can be withdrawn, but note which way roundit is fitted (see illustration). The driveshaft
engages with the lower end of the distributor
driveshaft.
5Thoroughly clean the mating faces of the oil
pump and cylinder block.
Refitting
6Commence refitting by inserting the oil
pump driveshaft into the cylinder block in its
previously noted position.
7Prime the pump by injecting oil into it and
turning it by hand.
8Fit the pump, insert the securing bolts, and
tighten them to the specified torque.
9Fit the pick-up tube securing bolt and
tighten it.
10Refit the sump.
Note: A new pressure relief valve plug and
pick-up tube gasket will be required for
reassembly.
Dismantling
1If oil pump wear is suspected, check the
cost and availability of new parts and the cost
of a new pump. Examine the pump as
described in this Section and then decide
whether renewal or repair is the best course of
action.
2Unbolt the pick-up tube and strainer.
Recover the gasket.
3Unscrew the three securing bolts and
remove the oil pump cover (see illustration).
31Oil pump - dismantling,
inspection and reassembly
30Oil pump - removal and
refitting
SOHC engines 2A¥21
2A
30.2 Unscrewing the oil pick-up tube
securing bolt
30.4 Withdrawing the oil pump driveshaft30.3 Unscrewing an oil pump securing bolt
29.18 Sump bolt tightening sequence -
refer to text29.16 Locate the sump gasket end tabs
beneath the rubber sealing strips
31.3 Exploded view of the oil pump
A Body
B Outer rotor
C Inner rotor
D Cover
E Strainer
F Pick-up tube
G Gasket
H Pressure relief valve

4Mark the rotor faces so that the rotors can
be refitted in their original positions, then lift
the rotors from the pump body.
5Remove the pressure relief valve plug by
piercing it with a punch and levering it out,
then withdraw the spring and plunger.
6Thoroughly clean all parts in petrol or
paraffin and wipe dry using a non-fluffy rag.
Reassembly and inspection
7Commence reassembly by lubricating the
relief valve plunger. Fit the plunger and spring.
8Fit a new relief valve plug, flat side
outwards and seat it with a drift until it is flush
with the pick-up mating face.
9Lubricate the rotors and fit them. Note the
marks made when dismantling, if applicable.
10The necessary clearances may now be
checked using a machined straight edge (a
good steel rule) and a set of feelerblades. The
critical clearances are between the lobes of
the centre rotor and convex faces of the outer
rotor; between the outer and pump body; and
between both rotors and the end cover plate
(endfloat). The desired clearances are given in
the Specifications (see illustrations).
11Endfloat can be measured by placing a
straight edge across the pump body and
measuring the clearance between the two
rotors and the straight edge using feeler
blades (see illustration).
12New rotors are only available as a pair. If
the rotor-to-body clearance is excessive, a
complete new pump should be fitted.
13Refit the pump cover and tighten the
securing bolts.
14Fit the pick-up tube and strainer, using a
new gasket.
15Temporarily insert the driveshaft into the
pump and make sure that the rotors turn freely.16Prime the pump before refitting.
Removal
1Remove the sump and the cylinder head.
2Check the big-end bearing caps for
identification marks and if necessary use a
centre-punch to identify the caps and
corresponding connecting rods (see
illustration).
3Turn the crankshaft so that No 1 crankpin is
at its lowest point, then unscrew the nuts and
tap off the bearing cap. Keep the bearing
shells in the cap and connecting rod.
4Using the handle of a hammer, push the
piston and connecting rod up the bore and
withdraw from the top of the cylinder block.
Loosely refit the cap to the connecting rod.
5Repeat the procedure in paragraphs 3 and
4 on No 4 piston and connecting rod, then
turn the crankshaft through half a turn and
repeat the procedure on Nos 2 and 3 pistons
and connecting rods.
Refitting
6Commence refitting as follows.
7Clean the backs of the bearing shells and
the recesses in the connecting rods and big-
end caps.
8Press the bearing shells into the connecting
rods and caps in their correct positions and oil
them liberally. Note that the lugs in
corresponding shells must be adjacent to
each other (see illustration).
9Lubricate the cylinder bores with clean
engine oil.10Fit a piston ring compressor to No 1
piston, then insert the piston and connecting
rod into No 1 cylinder (see illustration). With
No 1 crankpin at its lowest point, drive the
piston carefully into the cylinder with the
wooden handle of a hammer, and at the same
time guide the connecting rod onto the
crankpin. Make sure that the arrow on the
piston crown is facing the front of the engine.
11Oil the crankpin, then fit the big-end
bearing cap in its previously noted position,
and tighten the nuts to the specified torque.
12Check that the crankshaft turns freely.
13Repeat the procedure given in paragraphs
11 to 13 inclusive on the remaining pistons.
14Refit the cylinder head and the sump.
1Examine the pistons for ovality, scoring,
and scratches. Check the connecting rods for
wear and damage. The connecting rods carry
a letter indicating their weight class; all the
rods fitted must be of the same class.
2The gudgeon pins are an interference fit in
the connecting rods, and if new pistons are to
be fitted to the existing connecting rods, the
work should be carried out by a Ford dealer
who will have the necessary tooling. Note that
the oil splash hole in the connecting rod must
be located on the right-hand side of the piston
(the arrow on the piston crown faces forwards).
3If new rings are to be fitted to the existing
pistons, expand the old rings over the top of
the pistons. The use of two or three old feeler
blades will be helpful in preventing the rings
dropping into empty grooves. Note that the oil
control ring is in three sections.
33Pistons and connecting rods
- examination and renovation
32Pistons and connecting rods
- removal and refitting
2A¥22SOHC engines
31.10a Checking the oil pump outer rotor-
to-body clearance31.11 Checking the oil pump rotor endfloat
32.10 Fitting a piston ring compressor32.8 The bearing shell lugs (arrowed) must
be adjacent to each other32.2 Big-end cap and connecting rod
identification numbers
31.10b Checking the oil pump inner-to-
outer rotor clearance

4Before fitting the new rings to the pistons,
insert them into the cylinder bore and use a
feelerblade to check that the end gaps are
within the specified limits (see illustration).
5Clean out the piston ring groove using a
piece of old piston ring as a scraper. Be
careful not to scratch the aluminium surface
of the pistons. Protect your fingers - piston
ring edges are sharp.
6Fit the oil control ring sections with the
spreader ends abutted opposite the front of the
piston. The side ring gaps should be 25 mm (1.0
in) either side of the spreader gap. Fit the
tapered lower compression ring with the ÒTOPÓ
mark towards the top of the piston and the gap
150¼ from the spreader gap, then fit the upper
compression ring with the gap 150¼ on the
other side of the spreader gap. Note that the
compression rings are coated with a
molybdenum skin which must not be damaged.
Note also that the compression rings are made
of cast iron, and will snap if expanded too far.
Removal
1With the engine removed from the vehicle,
remove the timing belt, crankshaft sprocket,
auxiliary shaft sprocket and the
flywheel/driveplate.
2Remove the pistons and connecting rods. If
no work is to be done on the pistons and
connecting rods, there is no need to push the
pistons out of the cylinder bores.
3Unbolt the crankshaft front oil seal housing
and the auxiliary shaft front cover and remove
the gasket.4Remove the oil pump and pick-up tube.
5Check the main bearing caps for
identification marks and if necessary use a
centre-punch to identify them (see
illustration).
6Before removing the crankshaft, check that
the endfloat is within the specified limits by
inserting a feeler blade between the centre
crankshaft web and the thrustwashers (see
illustration). This will indicate whether or not
new thrustwashers are required.
7Unscrew the bolts and tap off the main
bearing caps complete with bearing shells. If
the thrustwashers are to be re-used identify
them for location. Recover the sealing wedges
from either side of the rear bearing cap.
8Lift the crankshaft from the crankcase and
remove the rear oil seal. Recover the
remaining thrustwashers (see illustration).
9Extract the bearing shells, keeping them
identified for location (see illustration).
Refitting
10Commence refitting as follows.
11Wipe the bearing shell locations in the
crankcase with a soft, non-fluffy rag.
12Wipe the crankshaft journals with a soft,
non-fluffy rag.
13If the old main bearing shells are to be
renewed (not to do so is a false economy,
unless they are virtually new) fit the five upper
halves of the main bearing shells to their
location in the crankcase.
14Identify each main bearing cap and place
in order. The number is cast on to the cap and
on intermediate caps an arrow is marked
which points towards the front of the engine.
15Wipe each cap bearing shell location with
a soft non-fluffy rag. 16Fit the bearing half shell onto each main
bearing cap.
17Apply a little grease to each side of the
centre main bearing so as to retain the
thrustwashers.
18Fit the upper halves of the thrustwashers
into their grooves either side of the main
bearing. The slots must face outwards.
19Lubricate the crankshaft journals and the
upper and lower main bearing shells with
clean engine oil and locate the rear oil seal
(with lip lubricated) on the rear of the
crankshaft.
20Carefully lower the crankshaft into the
crankcase.
21Lubricate the crankshaft main bearing
journals again, and then fit No 1 bearing cap. Fit
the two securing bolts but do not tighten yet.
22Make sure that the mating faces are
clean, then apply sealant (Loctite 518 or
equivalent) to the areas on the rear main
bearing cap shown (see illustration).
23Fit the rear main bearing cap. Fit the two
securing bolts but as before do not tighten yet.
24Apply a little grease to either side of the
centre main bearing cap so as to retain the
thrustwashers. Fit the thrustwashers with the
tag located in the groove and the slots facing
outwards (see illustration).
25Fit the centre main bearing cap and the
two securing bolts, then refit the intermediate
main bearing caps. Make sure that the arrows
point towards the front of the engine.
26Lightly tighten all main bearing cap
securing bolts and then fully tighten in a
progressive manner to the specified torque
wrench setting.
27Check that the crankshaft rotates freely.
Some stiffness is to be expected with new
34Crankshaft and main bearings
- removal and refitting
SOHC engines 2A¥23
2A
34.6 Checking crankshaft endfloat
34.22 Coat the arrowed areas of the rear
main bearing cap with sealant34.9 Extract each main bearing shell34.8 Removing a thrustwasher from the
centre main bearing
34.5 Main bearing cap identification marks.
The arrow points to the front of the engine
33.4 Checking a piston ring gap at the top
of the cylinder bore

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