Norton Commando Workshop Manual

## Engine/Primary Drive

# C

### SECTION C3

### VALVE REMOVAL AND REASSEMBLY

The valves need to be removed during decarbonising (as described in Section C4) or when changing valve springs or inlet guide to stem seals. Removal of the cylinder head (Section C1 ) and inlet rocker cover stud is necessary to gain access to the valves.
Proceed as follows:
1 | Using a suitable overhead valve spring compressor, (proprietary spring compressors are readily available) place the fixed jaw against the valve head and the movable jaw against the valve collar. Tighten down the movable jaw to compress the valve spring and remove the split collets. Collet removal may be facilitated by the use of a small screwdriver or long nose pliers.

2 | Release the pressure from the compressor and collect the valve, springs, collars and where necessary, the inlet guide seals.
3 | As each valve is removed, mark it in some way so that it can be replaced in the original position.
4 | Examine the valves for burning or damage and grind in the cleaned up or new valves as described in Section Ci. The seats shouid not need to be recut unless new valve guides have been fitted.
5 | Check the valve springs for collapse. This can most easily be done by comparison with new springs or by checking free length to the dimension given in Technical Data.
6 | Clean all parts very thoroughly in gasoline (petrol) and allow to dry.
7 | Ensure that heat insulators are fitted between the exhaust valve spring seat and cylinder head on all engines and that insulators are also fitted at the inlet positions on pre 1972 cylinder heads.

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