camshaft supported in the back bush only, the bush is short and some
movement will be manifest even with a new bush. Press in new bushes
from inside the crankcase with oil holes lined up, Both bushes are located
flush with the crankcase. When new they should be reamed in situ to ½"
+ .0005" — .0005". If new bushes are used, assemble the cam-wheels,
fit the timing cover tightly and check cam-wheel for end float and free
movement. Use a shim washer 016847 to absorb end movement. End play
can dislodge the metal cap on timing cover by hydraulic effect.
Reassembling the flywheels. If attention to the big end assembly is
needed, it is preferable, wherever possible, to use a factory serviced con
rod, as the big end liner, also small end bush, is finished ground in situ
to ensure concentricity. Alternatively, use a lapping tool A8078 for the
new con rod liner after it has been replaced. The degree of interference
fit between the liner and the con rod controls the contraction of the liner.
Although liners issued as spares are finished ground to a pre-determined
size, concentricity cannot be guaranteed, hence the use of a lapping tool
in some cases.
Removing the flywheel shafts. Both shafts are a press fit in the flywheels.
Remove in turn each shaft nut, support the flywheel and press out with
an arbour press, or similar equipment.
Refitting the shaft. The correct location of both shafts is of vital impor-
tance. If the drive shaft is incorrectly located, the alternator output will be
adversely affected. Looking at the outside of the flywheel, the shaft should
be inserted with the keyway for the rotor pointing forwards (approxi-
mately 9 o'clock).
If the timing side shaft is incorrectly located, the oil supply can be
curtailed (with damage to the oil pump plunger), also the valve timing will
be deranged. Use a pencil and scribe a line on the shank of the shaft dead
central with the oil hole. Offer up the shaft with the scribed line central
with the oil hole in the flywheel. Tap the end of the shaft to prevent it
moving then press firmly home with a suitable press. To check location of
shaft, fit the small pinion, the mark on the pinion should be exactly at
12 o'clock.
Tighten both shaft nuts with torque spanner set to 190 ft. lbs.
1 Dowel peg, locating timing gear cover.
2 Timing side flywheel axle with integral gear for driving oil
pump plunger.
3 Oil pump plunger.
4 Screw (one or three) with fibre washer, plugging oil passages
cast in crankcase.
5 Guide pin, for oil pump plunger. Inserted relieved tip down-
ward as shown.
6 Screwed body to accommodate the oil pump plunger guide pin.
7 Body, with guide pin in position engaged in profiled cam
groove of oil pump plunger.
8 Tapped hole, for pipe feeding oil to oil pump.
9 Tapped hole, for pipe returning oil to oil tank.
Key to
FIG 9
43
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