FORD SIERRA 1988 2.G CVH Engines Owner's Manual

6Unscrew and remove the six securing bolts,
and withdraw the oil pump over the front of
the crankshaft. Recover the gasket.
Refitting
7Commence refitting by prising the
crankshaft front oil seal from the pump
housing.
8Prime the pump by injecting clean engine
oil into it and turning it by hand.
9Using a new gasket, fit the oil pump over
the front of the crankshaft, ensuring that the
central rotor engages with the flats on the
crankshaft (see illustration). Fit the securing
bolts, and using a straight-edge, ensure that
the bottom face of the oil pump is aligned with
the bottom face of the cylinder block before
finally tightening the bolts.
10Using a new gasket, fit the oil pick-up
tube to the oil pump and secure with the two
bolts.11Refit the oil strainer/pick-up tube securing
nut to No 4 main bearing cap.
12Refit the sump.
13Fit the crankshaft front oil seal using a
suitable tool.
14Refit the thrustwasher, crankshaft
sprocket and timing belt.
1.8 litre (R2A type)
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.
2Using a suitable Torx socket, unscrew the
seven securing bolts and remove the oil pump
cover (see illustration).
3Mark the rotor faces so that the rotors can
be refitted in their original positions, then lift
the rotors from the pump housing (see
illustration).
4Unscrew the pressure relief valve plug and
withdraw the spring and plunger (see
illustration).
5Thoroughly clean all parts in petrol or
paraffin and wipe dry using a non-fluffy rag.
6Commence reassembly by lubricating the
relief valve plunger. Fit the plunger and spring,
and screw the plug into place.
7Lubricate the rotors and fit them, observingthe marks made when dismantling, if
applicable.
8The necessary clearances may now be
checked using a machined straight-edge
(such as a good steel rule) and a set of feeler
blades. The critical clearances are between
the lobes of the centre rotor and convex faces
of the outer rotor; between the outer rotor and
pump body; and between both rotors and the
cover plate (endfloat). The serviceable
clearances are given in the Specifications.
9Endfloat 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.
10Refit the pump cover and tighten the
securing bolts.
11Prime the pump before refitting.
1.6 and 1.8 litre (R6A type)
12The procedure is as described above but
refer to the Specifications at the beginning of
this Chapter for the rotor clearances.
1.8 litre (R2A type)
Removal
1With the engine removed from the vehicle,
remove the sump and the cylinder head.
2Check the big-end caps for identification
marks and if necessary use a centre-punch to
identify the caps and connecting rods (see
illustration).
3Turn the crankshaft so that No 1 crankpin is
at its lowest point, then unscrew the nuts or
bolts and tap off the 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.
30Pistons and connecting rods
- removal and refitting
29Oil pump - dismantling,
inspection and reassembly
CVH engines 2C•21
2C
29.2 Remove the oil pump cover
30.2 Big-end cap and connecting rod
identification marks (arrowed) -
1.8 litre (R2A)29.4 Unscrew the pressure relief valve plug
and withdraw the spring and plunger29.3 Lifting out the oil pump inner rotor
28.9 Refitting the oil pump28.5 Removing the oil pick-up tube from
the oil pump

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 must be
adjacent to each other (see illustration).
9Lubricate the cylinder bores with engine oil.
10Fit a ring compressor to No 1 piston then
insert the piston and connecting rod into No 1
cylinder. 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. The piston must be
fitted with the cut-out in the piston crown (and
the lug on the piston skirt), facing the front of
the engine, with the oil hole in the connecting
rod on the inlet manifold side of the engine
(see illustrations).
11Oil the crankpin, then fit the big-end
bearing cap in its previously noted position,
and tighten the nuts or bolts to the specified
torque.
12Check that the crankshaft turns freely.
13Repeat the procedure given in
paragraphs 11 to 12 inclusive on the
remaining pistons.
14Refit the cylinder head and the sump.
1.6 and 1.8 litre (R6A type)
15The procedure is as described above,
noting the following points:
a)On the 1.6 litre engine, when refitting a
piston/connecting rod assembly, the
piston must be fitted with the arrow on
the piston crown and the cast pip on the
piston skirt facing the front (timing belt
end) of the engine (see illustration).
b)On the 1.6 litre engine, the big-end
bearing caps locate on dowels in the
connecting rods, and can only be fitted in
one position.
1.8 litre (R2A type)
1Examine the pistons for ovality, scoring,
and scratches. Check the connecting rods for
wear or damage.
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 hole in the connecting rod must be
located on the right-hand side of the piston
(the cut-out in the piston crown and the lug on
the piston skirt face forwards).
3If new rings are to be fitted to the existing
pistons, expand the old rings over the top ofthe pistons (see illustration). Note that the oil
control ring is in three sections.
4Before fitting the piston rings, clean out the
piston ring grooves 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. Also
probe the groove oil return holes.
5Fit 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
31Pistons and connecting rods
- examination and renovation
2C•22CVH engines
30.8 Bearing shell lug (arrowed) must
engage with groove in big-end cap -
1.8 litre (R2A)30.10b . . . and lug (arrowed) on piston skirt
must face the front of the engine
31.3 Using an old feeler gauge to aid the
fitting of a piston ring - 1.8 litre (R2A)30.15 The arrow (A) and the cast pip (B)
must face the front of the engine - 1.6 litre
30.10d Fitting a piston and connecting rod
into the cylinder bore - 1.8 litre (R2A)30.10c Connecting rod oil hole (arrowed)
must face inlet manifold side of engine -
1.8 litre (R2A)
30.10a Cut-out (arrowed) in piston
crown . . .
The use of two or three old
feeler blades will be helpful
in preventing the rings
dropping into empty grooves.

the tapered lower compression ring with the
“TOP” mark towards the top of the piston and
the gap 150º from the spreader gap, then fit
the upper compression ring with the gap 150º
on the other side of the spreader gap. Note
that the compression rings are coated with a
molybdenum skin which must not be
damaged.
1.6 and 1.8 litre (R6A type)
6Proceed as described in paragraphs 1 to 5
inclusive, but note the following differences
for the 1.6 litre engine.
7Before fitting the new rings to the pistons,
insert them into the relevant cylinder bore and
use a feeler blade to check that the end gaps
are within the limits given in the Specifications
at the beginning of this Chapter. Check the
end gaps with the ring at the top and the
bottom of the cylinder bore.8Fit the oil control ring sections with the
spreader ends abutted opposite the front of
the piston, making sure that the ends do not
overlap. The side ring gaps should be offset
120º either side of the spreader gap. Fit the
tapered lower compression ring with the
“TOP” mark uppermost and the gap 120º
from the spreader gap, then fit the upper
compression ring with the gap 120º on the
other side of the spreader gap. Note that the
compression rings are coated with a
molybdenum disulphide skin, which must not
be damaged.
1.8 litre (R2A type)
Removal
1With the engine removed from the vehicle,
remove the timing belt, crankshaft sprocket
and thrustwasher.
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.
3Remove the oil pump and pick-up tube.
4Unscrew the four securing bolts and
remove the crankshaft rear oil seal housing.
5Check the main bearing caps for
identification marks and if necessary use a
centre-punch to identify them.
6Before removing the crankshaft, check that
the endfloat is within the specified limits byinserting a feeler blade between the centre
crankshaft web and the thrust bearing shell
(see illustration). This will indicate whether a
new thrust bearing shell is required.
7Unscrew the bolts and tap off the main
bearing caps complete with bearing shells.
8Lift the crankshaft from the crankcase.
9Extract the bearing shells, keeping them
identified for location.
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. Note the flanged
thrust bearing shell should be fitted to the
centre bearing location (see illustrations).
14Identify each main bearing cap and place
in order. The number is cast on to the cap and
an arrow is also marked which should point
towards the front of the engine.
15Wipe the cap bearing shell location with a
soft non-fluffy rag.
16Fit the bearing half shell onto each main
bearing cap.
17Lubricate the crankshaft journals and the
upper and lower main bearing shells with
clean engine oil.
18Carefully lower the crankshaft into the
crankcase (see illustration).
19Lubricate the crankshaft main bearing
journals again, then fit No 1 bearing cap. Fit
the two securing bolts but do not tighten yet.
20Fit the rear bearing cap, then the centre
bearing cap, but as before do not tighten the
bolts yet.
21Fit the intermediate bearing caps and
securing bolts, noting that the studded bolt
which retains the oil strainer/pick-up tube fits
on the inlet manifold side of No 4 bearing cap.
Again, do not tighten the bolts yet.
22Check that the arrows on the bearing
caps all point towards the front of the engine,
and lightly tighten all the bearing cap bolts,
then finally tighten the bolts in a progressive
manner to the specified torque (see
illustrations).
32Crankshaft and main bearings
- removal and refitting
CVH engines 2C•23
2C
32.13b Centre main thrust bearing shell in
cylinder block - 1.8 litre (R2A)
32.22b Tightening a main bearing cap bolt.
Note studded bolt location (arrowed) on
No 4 bearing cap - 1.8 litre (R2A)32.22a The arrows on the bearing caps
must point towards the front of the engine
- 1.8 litre (R2A)32.18 Lowering the crankshaft into the
crankcase - 1.8 litre (R2A)
32.13a Rear main bearing shell in cylinder
block - 1.8 litre (R2A)
32.6 Checking crankshaft endfloat -
1.8 litre (R2A)

23Check that the crankshaft rotates freely.
Some stiffness is to be expected with new
components, but there must be no tight spots
or binding.
24Check that the crankshaft endfloat is
within the specified limits by inserting a feeler
blade between the centre crankshaft web and
the thrust bearing cap.
25Lubricate the oil seal lip with clean engine
oil, then carefully fit the crankshaft rear oil seal
housing. 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 securing
bolts (see illustration).
26Carefully prise the crankshaft front oil seal
from the oil pump housing, then refit the oil
pump, oil strainer/pick-up tube and
crankshaft front oil seal.
27Refit the pistons and connecting rods.
28Refit the thrustwasher, crankshaft
sprocket and timing belt.
1.6 and 1.8 litre (R6A type)
29Proceed as described above, noting the
following point:
On the 1.6 litre engine, note that
thrustwashers are used at the centre main
bearing (one each side of the bearing)
instead of a thrust bearing shell to control
crankshaft endfloat. Oversize
thrustwashers are available to
compensate for wear if necessary. The
thrustwashers should be fitted with the oil
grooves visible
1.8 litre (R2A type)
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.
4If the crankshaft endfloat is more than the
maximum specified amount, a new thrust
bearing shell should be fitted to the centre
main bearing.
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
filament is checked with a plastic gauge andthe running clearance compared with that
given in the Specifications.
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.
1.6 and 1.8 litre (R6A type)
7Proceed as described above but note that if
the crankshaft endfloat is more than the
maximum specified amount, new
thrustwashers should be fitted to the centre
main bearing.
Refer to Section 36, Chapter 2, Part A but
note that the crankcase ventilation baffle
should be removed from its location at the
rear of the cylinder block and cleaned if
necessary (see illustration).
Refer to Section 37, Chapter 2, Part A.
35Initial start-up after overhaul or
major repair
34Cylinder block and bores -
examination and renovation33Crankshaft and bearings -
examination and renovation
2C•24CVH engines
32.25 Fit the crankshaft rear oil seal
housing and tighten the securing bolts -
1.8 litre (R2A)34.1 Removing the crankcase ventilation
baffle