Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

### SECTION C29

### RE-ASSEMBLING CRANKSHAFT TO CRANKCASES

Since it is simpler to slide the drive side crankcase with the outer main bearing race over the complete assembly of the other crankcase with crankshaft than vice versa, we recommend the following routine:
1 | Push the timing side crankcase over the crankshaf which must be supported upright on the bench See Fig C34. At this time check that the connecting rods clear the crankcase mouth of the crankshaft end of the bearing. If the bearing is too tight to push home over the crank, place a scrap main bearing inner race and a large washer over the crankshaft, outboard of the timing side crankcase then, using the oil pump driving worm on the crankshaft, pull it home through the bearing.
2 | Position the camshaft thrust washer over the timing side camshaft bush and locate this, flat side towards the crankcase and bush, locating with a blob of grease. On engines after 200000 there are 2 thrust washers at the right hand side, the tabs of which must face towards the right crankcase.
It is important that the tabs are properly located in the hole and that they are not dislodged at a later stage when the camshaft sprocket is fitted.

3 | Smear the timing side crankcase joint facing with a non-setting sealing compound. A little may be applied to the timing side case facing where there is no spigot.
4 | Into the drive side camshaft bush fit the rotary disc followed by the spring on engines before 200000 and camshaft, oiling the bearing surface slightly.
5 | Engage the camshaft with the driving dogs on the disc on engines before 200000.
6 | Offer the drive side crankcase to the timing side atter oiling the camshaft bearing area and the drive side roller main bearing. The operation of mating the crankcases is shown in Fig. C35. It will be noted that the camshaft is held in position against the breather disc and spring with one finger during this operation before 200000. Ensure that washer tabs are seated throughout this operation until cases are mated. It is most important that the drive side connecting rod does not come into contact with the crankcase mouth and at the final stage of mating the crankcases, it may well be necessary to turn the tachometer drive to locate into the camshatt worm drive.
7 | Now tap the crankcases together with a hide hammer until the joint faces meet all-round.

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