Norton Commando Workshop Manual

## Engine/Primary Drive

# C

8 | Remove the rocker feed pipe banjo unions from both sides of the rocker boxes and collect the copper washers from both sides of the banjos. Leave the rocker feed pipe connected to the timing case.
9 | Remove both sparking plugs.
10 | Remove the cylinder head securing bolts and nuts (excepting the front centre bolt).
11 | To achieve the minimum valve lift position and allow maximum space for removing the cylinder head, turn the engine by revolving the rear wheel with top gear engaged until the pistons are as near as possible to top dead centre.
12 | Remove the cylinder head front centre bolt and the head shouid lift slightly against valve spring pressure.

Technique at this stage is to lift the cylinder head and recess the pushrods into the head as far as possible so that the head can be slid out between the cylinder barrel and frame tubes. Do this as follows:
13 | Lift the cylinder head from either side of the motor cycle, support with one hand and slide the push rods as far as possible into the cylinder head. Fig. C3 shows the cylinder head tilted to the rear to facilitate the operation.
14 | Withdraw the cylinder head.
The cylinder head gasket may adhere either to the cylinder or cylinder head. The gasket shouid be removed and protected from damage since, if remaining in undamaged condition, it may be put into further service.

### SECTION C2

### REMOVAL OF ROCKERS

In order to gain access to the inlet valve guides, the inlet rockers and spindies may have to be removed as follows:
1 | Remove the two set screws retaining each rocker spindie cover plate (see Fig. C4).
2 | Collect the cover plate, retaining plate and gaskets as a set. In all probability these items will adhere to one another and need not be disturbed.
3 | Extract the rocker spindies using Service Tool 061028 as shown in Fig. C5. This is necessary since the spindies are a tight fit. Extremely tight spindies will necessitate heating the whole cylinder head in hot water prior to removal.
4 | Lift out the rockers and collect the plain and double spring thrust washers. On each rocker the plain thrust washer is outboard of the rocker and the double spring washer inboard (see Fig. C4).

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