2A•18 Engine in-car repair procedures
11.12a Removing the inner rotor.
11 Wipe clean the inner faces of the pump
rotors, and identify them for position with a
marker pen. It is important that the rotors
remain in their correct original positions on
reassembly. Note that on balance shaft
engines, the outer rotor position is identified
by the punch hole facing outwards.
12 Remove the rotors from the timing cover
(oil pump body), keeping them identified for
position (see illustrations).
13 Unscrew the plug, and remove the relief
valve spring and plunger, noting which way
round they are fitted (see illustrations).
Recover the plug washer.
14 Clean all components, and examine them
for wear and damage. Examine the pump
rotors and body for signs of wear ridges and
scoring. Using a feeler blade check the
clearance between the outer rotor and the
timing cover, with reference to the
Specifications (see illustration). If worn
excessively, the complete pump assembly
must be renewed.
15 Examine the relief valve plunger for signs
of wear or damage, and renew if necessary.
The condition of the relief valve spring can
only be measured by comparing it with a new
one; if there is any doubt about its condition, it
should also be renewed.
16 If there are any signs of dirt or sediment in
the oil pump, it will be necessary to remove
the sump, and clean the pick-up/strainer (see
11.12b . . . and outer rotor from the timing
cover. Note that the position mark
(arrowed) is facing outwards
17 Insert the relief valve plunger and spring,
then refit the plug together with a new washer,
and tighten the plug.
18 Lubricate the rotors with fresh engine oil,
then insert them in the oil pump body in their
original positions. The outer rotor must be
positioned with the identification mark facing
19 Wipe clean the oil seal seating in the oil
pump casing, then drive a new oil seal into the
casing, making sure that it enters squarely and
is fitted in the previously-noted position.
20 On B204/B234 engines, fit a new O-ring
seal, then insert the oil pump in the timing
cover, making sure that the alignment arrows
point to each other. Refit the large circlip in the
groove with its chamfer facing outwards, and
the opening facing downwards.
21 On B202 engines, locate a new O-ring seal
in the oil pump groove, then clean the contact
surfaces of the oil pump and cylinder block.
Locate the oil pump over the nose of the
crankshaft, and onto the dowels. Insert the
bolts, and tighten them progressively to the
specified torque. Note that two of the bolts are
through-bolts into the cylinder block, and are
tightened to the same torque as the timing
22 Locate the crankshaft pulley and hub on
the end of the crankshaft. Insert the centre
bolt and tighten it to the specified torque,
holding the crankshaft stationary using one of
11.13a Unscrew the plug (arrowed)...
the methods described in paragraph 5.
23 Refit the auxiliary drivebelt with reference
to Chapter 1.
24 Where applicable, refit the air conditioning
compressor drivebelt, with reference to
25 Refit the wing liner and moulding, and
tighten the screws.
26 Refit the right-hand front wheel, and lower
the car to the ground.
27 Before running the engine, disconnect the
ignition wiring harness to the distributor or Dl
ignition cartridge to disable the ignition
system, then spin the engine on the starter
motor until oil pressure is restored and the oil
pressure warning light is extinguished.
Reconnect the wiring harness, and run the
engine to check for oil leaks.
11.13b . . . and remove the relief valve
spring (A) and plunger (B)
11.14 Checking the clearance between the
oil pump outer rotor and the timing cover
1 An oil cooler is fitted to Turbo models only.
It is connected to ports on an adapter fitted to
the oil filter, and the adapter also incorporates
an oil thermostat.
2 To remove the oil cooler, first jack up the
front of the car and support on axle stands
(see "Jacking, towing and wheel changing"). If
necessary, drain the engine oil as described in
Chapter 1, then refit and tighten the drain plug.
3 Position a suitable container beneath the oil
cooler on the right-hand side of the engine
compartment. Unscrew the unions from the
top and bottom of the oil cooler, and
disconnect the oil supply and return hoses.
Allow any oil to drain into the container.
4 Unscrew the mounting bolts and remove
the oil cooler. On early models, the lower
mounting bolt holes are slotted, and therefore
the lower bolts need only be loosened. Lift the
oil cooler from engine compartment.
5 Refitting is a reversal of removal, but tighten
the unions to the specified torque. Fill the
engine with oil with reference to Chapter 1. On
completion, start the engine and run it at a fast