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
