Norton Commando Workshop Manual

## Engine/Primary Transmission

# C

7 | Fit and tighten down the short cylinder head bolt with its washer - this bolt shouid be inserted down through the cylinder head fins to the centre front position. The cylinder head shouid be pulled down to the gasket against valve spring pressure using this bolt.
8 | Check that all four pushrods are correctly engaged to the ball ends of the rocker arms.
9 | If pushrod engagement is correct, fit the four bolts with washers on either side of the sparking plugs, followed by a long sleeve nut under each exhaust port and a short nut under the inlet ports, (these are without washers) and 2 5/16 in. nuts and washers on the studs (no's 9 and 10 in Fig. C2) which seal the joint by the pushrod tunnel. There are no washers on the nuts fitted from beneath the cylinder head.
10 | Finally tighten the cylinder head bolts and nuts in the order shown in Fig. C2. The torque settingsare: Cylinder head bolts and nuts 3/8 in: 30 Ibs./ft. (3.68 Kg/m). Cylinder head bolts 5/16 in.: 20 Ibs./ft. (2.75 Kg/m).
11 | Adjust the rocker clearances as .described in Section C10.
12 | Using new sealing gaskets only if the originals are unfit for further use, refit the inlet and exhaust rocker covers and secure with the blind nuts. There is a washer only at the inlet rocker cover nut.

13 | Refit the carburettors with spacers as described in Section E5, and refit the sparking plugs to avoid washers being dropped into the engine during the next operation.
14 | Refit the cylinder head steady as a reversal of the dismantling procedure.
15 | Reconnect the rocker feed pipe banjos at the cylinder head using copper washers at each side of the banjos. Take care that the plastic part of the rocker pipe is clear of the rocker boxes, cylinder head and head steady.
16 | Refit the coil cluster to the frame as a reversal of the dismantling procedure and connect the spark plug caps.
17 | Reconnect the low tension leads from the contact breaker to the main harness. These leads are coloured white/black and yellow/black and should be connected colour to colour. The standard assembly procedure is white/black to right cylinder and yellow/black to left cylinder.
18 | Refit the exhaust system (Section F19).
19 | Refit the fuel tank (Section F9) and connect the fuel lines.
20 | Refit the scat and secure with the knurled side nuts.
21 | Refit the fuse.

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