Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

8 | Before tightening the crankcase securing nuts, ensure that there is end float on the camshaft, indicating its freedom.
9 | Fit the crankcase front and rear screws, studs, nuts and washers.
10 | Fit the short front crankcase mating bolt from drive side to timing side then fit the front bottom stud unless the crankcase is to be mounted in the vice in which case this front bottom stud should be omitted until a later stage.
11 | Fit the two slot headed set screws from the timing side.
12 | Tighten the mating nuts and screws evenly in rotation and wipe away surplus jointing compound remaining on the outside of the crankcase joint facing.

### SECTION C30

### ASSEMBLING RIGHT (TIMING SIDE) OF ENGINE

Having assembled the crankcases as detailed in Section C29, mount the crankcases in a plain jaw vice to facilitate handling. Re-assembly of the cam chain, sprockets and oil pump may now be undertaken as follows:
1 | Fit the oil sealing disc over the timing side crankshaft, lip outwards.
2 | Fit the cut-away backing washer.
3 | Fit the woodruff key into the crankshaft then place on the crankshaft pinion, chamfered teeth and timing mark outwards. It may be necessary to tap the pinion fully home using a suitable tube as a drift.
4 | Turn the crankshaft to top dead centre so that the timing pinion marking is uppermost.
5 | Take the intermediate gear sprocket, the camshaft sprocket and cam chain, assembling as shown in Fig. C36. For correct timing the timing marks must be 10 rollers apart on the chain as shown in the illustration.

6 | Locate the camshaft sprocket and intermediate gear and sprocket in position, mating up the marked space between the teeth on the intermediate gear with the marked tooth on the timing pinlon. On all engines it will be found that there is a paint marking to illustrate more clearly the timing position on the intermediate timing gear.
7 | Assemble the chain tensioner as shown in Fig. C37, noting that the clamping plates differ, the inner one being thinner than the outer and the inner being fitted long end down whilst the outer clamping plate is fitted long end up.
8 | Fit the chain tensioner, fan disc washers and nuts moving the tensioner blade up to give a maximum 1/8 in. (3.17 mm) up and down movement at the tightest point of the chain and nip up the tensioner securing nut. Before finally locking up these nuts, rotate the crankshaft a little at a time, checking at each stage the chain tension lest there should be a tight spot on some point of the chain. When chain tension is correct, finally lock up the tensioner securing nuts.

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