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standing on the bench and a hammer driving a
lump of soft wood against the crankcase facing,
permitting this to be jarred free of the
crankshaft. If removal should prove difficult by
this means, the crankcase in the area surrounding
the main bearing should be heated by a soft flame
and the same removal procedure followed so that the
main bearing and crankshaft together are displaced
from the crankcase. The bearing can then be removed
at a later stage. On engines after number 200000 a
roller timing side bearing is used and on such
units there should be no difficulty in crankshaft
removal.
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SECTION C17
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CRANKCASE OVERHAUL
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The following text covers the renewal of main
bearings only. In our experience the camshaft
bushes have an extremely long life and renewal
cannot be accomplished without extensive machining
facilities. To remove the main bearings, it is
necessary to heat the area surrounding each main
bearing with a soft flame such as a gasolene or
kerosene (petrol or paraffin) blow lamp or butane
or propane. Once the cases have been heated, in the
case of a timing side crankcase equipped with the
ball type of main bearing, use a suitable soft
drift against the inner race of the main bearing
and the bearing can be drifted out. In the case of
a timing side crankcase equipped with the roller
type of main bearing, heat the area of the
crankcase surrounding the main bearing and by
bumping the joint facing of the cankcase hard
against a flat wooden surface, the main bearing
outer race should be dislodged. In the case of
drive side crankcases, the complete crankcase will
need to be appreciably hotter since the only method
of removing the main bearing outer race will be to
bump the crankcase sharply against a flat wooden
surface.
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To refit the main bearings, the cases must be
similarly heated and the main bearings, whether of
the ball or roller variety should drop, completely
freely, into their housings. The main bearings must
be fully home into the housings both at the drive
side and timing side cases.
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