Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

### SECTION C36

### TACHOMETER DRIVE

The tachometer drive is taken from the warm drive at the right end of the camshaft. The cable has an adaptor for the cable between the lower end of the cable and tachometer driven gear. The driven gear is removable after removing two screws and lifting clear the housing and '0' sealing ring but damage to the drive gear can only be corrected by replacing the camshaft.

### SECTION C37

### REMOVING AND REFITTING ENGINE COMPLETE

For ease of handling the engine unit may be removed from the mounting plates as a unit so that it can be dealt with on the bench. Proceed as follows:
1 | Remove the left footrest and brake pedal and allow these to hang on the cable.
2 | Drain and remove the outer primary chaincase, alternator rotor nut and alternator stator. The stator can be left attached to the inner chaincase by the lead but disconnect the two connectors beneath the airbox and lever off the rotor.
3 | Slacken off clutch adjustment, compress the clutch diaphragm spring (this requires tool 060999) and remove circlip.

4 | Fit clutch hub tool 061015 and remove clutch centre nut and fit engine sprocket extractor tool 060941. Remove engine sprocket and lift entire engine sprocket - primary chain - clutch assembly away.
5 | Flatten tab washers locking three bolts around crankshaft stub, remove the three bolts and lift off inner chaincase.
6 | Remove rubber breather hose (near primary cover on early models; under rear of engine on 1972 and later).
7 | Detach engine ground wire attached to lower left crankcase stud.
8 | Remove fuel tank, ignition coils, carburettor top caps and withdraw slide assemblies. Remove exhaust pipes and upper Isolastic head steady.
9 | Drain oil from oil tank and remove oil feed lines from boss beneath timing cover. Remove rocker oil feed pipe.
10 | Disconnect the contact breaker lead wires and tachometer drive cable.
11 | Slip a sturdy support (wood block or metal rod) between engine and lower frame tubes.
12 | Remove bolts holding rear of engine to engine cradle so engine hinges on front Isolastic mount.
13 | Loosen small bolts holding front engine mount. STEADY ENGINE and remove large Isolastic mount bolt, then the small bolts and lift out front Isolastic mount.
14 | Engine is now free and can be lifted clear of frame to right side on to work bench. Refitting is a direct reversal of the foregoing.

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