Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

8 | 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.
| 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.

9

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.

10 | 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.
11 | 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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