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8
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Remove the oil pump driving worm from the
crankshaft with its integral left hand threaded
nut. To achieve this it is necessary to stop the
crankshaft turning in the cases either by passing a
round bar through the small ends and supporting on
clean wooden blocks across the crankcase mouth or
by placing a suitable bar into the deepest balance
hole and allowing the bar to abut against the
crankcase mouth in a similar manner to that shown
in Fig. C22.
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Special Note: There is a risk of breaking the
oil à shroud portion of the crankcase over
the camshaft if the bar is allowed to abut to this.
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9
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With the flywheel still prevented from turning,
remove the nut securing the camshaft sprocket.
à Under no circumstances must anything but
firm steady pressure be applied to unscrew the
camshaft sprocket nut - normal right hand thread -
unless a dummy cut away timing cover is fitted and
secured with screws at extreme front rear and
bottom. If a hammer or mallet is used without such
a cover to support the end of the intermediate gear
spindle, there is risk of the latter boing pulled
out of the crankcase.
The size of the sprocket nut is 9/16 in.
Whitworth.
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10
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Lift the sprocket, idier gear and timing chain
away as a set. If the camshaft sprocket should
prove to be tight on the camshaft, with care use
flat type tyre levers as shown in Fig. C23 to ease
the sprocket away. Take great care not to mark the
crankcase joint facing. Remove the thrust washer
behind cam sprocket on engines after 200000.
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11
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Providing the timing cover joint gasket is not
damaged during dismantling, there is no reason why
it should be removed from the crankcase facing as
it will be perfectly suitable for re-use.
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