SECTION C25
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SERVICING THE OIL PUMP
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Removal of the oil pump is described in Section
C16. The criterion of oil pump condition is the
degree of end float on the oil pump pinions, most
easily felt by movement of the oil pump driving
gear relative to the pump body. After some period
of use, the tendency is for the pinions to wear
into the pump end covers and such wear can only be
removed by taking off the covers and flattening
down the actual pump body.
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1
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Detach the pump top covers and drive gear with
drive spindle by tapping the spindles through the
keyed pinion with a pin point drift. The remaining
parts can be lifted from the pump body at this
stage.
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2
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Wash all the components thoroughly in clean
gasoline (petrol) and allow to dry.
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It is most important to correct end float on the
feed gears (the narrow ones) first.
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3
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Remove the feed gears and rub down the back
plate end of the pump body surface against a high
grade quality emery cloth on a- perfectly flat
surface such as a small surface plate. Flattening
of the surface should continue a little at a time
until the stage is reached where, on re-assembly of
the oil pump, there is barely discernible stiffness
on the oil pump driving spindle. This barely
discernible stiffness will indicate that there is
just suflicient freedom of movement and that there
is no excess clearance between the feed gears and
housing.
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4
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Remove the feed gears and repeat the flattening
down process on the return side of the pump body
until with the return gears only in the pump body
and the screws tight there is similar slight
stiffness.
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5
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Strip the pump body again and wash with very
great care. Reassemble the pump and tighten the
screws completely. At this stage there should be
some degree of stiffness in the complete pump.
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6
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Introduce oil into the feed hole then, holding
the oil pump with one hand, place a ring spanner
over the driving spindle nut, and revolve the oil
pump a number of times to allow oil to circulate
completely. The oil pump should now have freed off
considerably. Slight stiffness remaining should
decrease, if not disappear completely.
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SECTION C26
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TIMING COVER
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There are two garter type seals in the timing
cover, one at the contact breaker housing and one
to seal the crankshaft to the cover.
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Contact Breaker Seal- Failure of this
seal is indicated by the presence of oil in the
contact breaker housing. To remove the old scal it
is necessary to prise out with a screwdriver or
similar implement thus rendering the seal scrap. A
new seal should be fitted, pressure side, that is
spring side, towards the engine and the seal should
be tapped fully home into the housing using Service
Tool 063966.
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Crankshaft Seal - This seal is retained
in the housing with a circlip. After removing the
circlip, the seal can be prised out of its housing
but will be damaged beyond further use. Care must
be taken to avoid damage to the housing. Fit the
new seal pressure side towards the timing cover and
drive fully home using Service Tool 063967. Refit
the circlip "sharp'' side towards the crankcase and
make sure that it is fully seated allround.
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Where a new timing cover is being prepared for
fitting, check that the blanking plug shown in Fig.
C30 is in position. The timing cover odd screw
lengths are shown in Fig. C31.
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