When matching
a
plunger in the pump
disc,
if
it is found to be too
tight
a
fit, carefully lap
the plunger
in
the pump dfsc. Using metal polish until it is just
free.
If
the pump disc is not seating properly in the
timing
cover or
if
a
new pump disc is fitted, it
should be ensured that the pump disc matches properly and
has
a perfect seating in the
timing
cover.
Lap the discs
in
the timing cover with fine metal lapping paste or liquid metal polish using
special tools PED
2034
ST
for feed pump disc and PED
2035
ST
for return pump disc,
until
a
fme, grey surface is obtained on the pump disc face.
NOTE:
Replacement pump discs have a lip left at the opposite side of the lapped face. The
purpose of this is to hold the disc.
central
in
the housing
during
lapping-in. it should
be
filed
off before the pump is finally assembled. Care should
be
taken not
to
damage the lapped face.
Wash
all
components and passages. thoroughly with petrol, after lapping,
to
remove
all
traces of grinding paste. Check the pump disc springs for fatigue by assembling
in
the
timing
cover and placing the pump covers
in
position. The latter should
be
held 1_/8"off
the
timing
cover
if
the springs are correct. The pump spindle should be renewed
if
excessive wear
has
taken place on the teeth.
Reassemble the oil pumps, replacing the cover gaskets. Before fitting each cover
£ill
the
pump chamber with clean oil. Having assembled the pumps, lay the
timing cover flat and
the oil ports using an oil
can.
Turn
the pump spindle with
a
screwdriver
in
a
clockwise
direction and it
can
then
be
checked
whether the pumps are operating correctly. Before replacing
the timing cover on the engine.
£ill
the filter chamber
with
clean oil and fit the filter element.
NOTE:
With the engine running, the oil feed to the big end
can
be checked
by
partially
unscrewing the feed plug in the timing cover between the oil pumps and the oil return
can
be
checked
by
slackening
the rocker pipe banjo bolt on the cylinder head and obsen?ng the oil
flow.
4.
Removal
of
Pump
Worm
and
Timing
Pinion
Unscrew the pump worm using the hexagon head behind the worm, with special tool PED
2006.
Withdraw the timing pinion using special tool PED
20 13.
CAUTION:
The worm nut has a left hand thread. When turned clock wise the worm nut can
be loosened and when turned anticlockwise the
worn nut gets tightened.
NOTE:
When refitting the timing cover ensure that the cork is in position
in
the worn nut
and is undamaged. This forms
a
seal between the oil feed plug and the oil passage
in
the
crank
shaft, timing side. If necessary this should be replaced and care should
be
taken
to
have it
fitted correctly.
CAUTION:
If this cork is not fitted or damaged. thkoil feed to the
big
end
bearing
through
the timing shaft
will
tend to escape past this point causing starvation of lubrication
to
the big
end bearing leading to premature failure of the big end floating bush, engine bearings and
other parts.
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