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Replacement
When refitting the cylinder head, it is advisable to use a new gasket. The seals fitted between the
front camshaft bearings and the engine front plate should be examined and renewed if necessary.
Tighten the cylinder head nuts in the correct sequence (see Fig. A.3), using a torque Wrench. The
torque wrench settings are given in the 'GENERAL DATA' section.
Reassembly continues in the reverse order to the dismantling procedure. After final tightening of the
cylinder head nuts check the valve clearances and adjust if necessary (see Section A.18).
A.12 CAMSHAFT BEARINGS
Each camshaft runs in three non-adjustable white-metal shell bearings.
To renew the bearings, disconnect the camshaft driving sprockets and remove the camshafts (see
Section A.11) when the bearings may be extracted.
Care should be exercised to see that the bearing journals, etc., are thoroughly cleaned before
installing new bearings. No scraping is required, as the bearings are machined during manufacture to
give the correct diametrical clearance.
A.13 CYLINDER HEAD
Removal
Drain the cooling system and remove the header tank, thermostat housing, and exhaust manifolds as
detailed in Section A.9. Remove the air cleaners and carburetters as described in Section A.5.
Unscrew the cylinder head oil feed pipe at the right-hand rear of the head.
Remove the two bolts, spring washers, and plain washers securing the cylinder head water intake
pipe at the rear of the head.
Detach the high-tension cables and remove the sparking plugs, taking care not to damage the
porcelain insulators.
Remove the camshaft covers and disconnect the camshafts from their driving sprockets (see Section
A.10).
Remove the 10 cylinder head retaining nuts and the cylinder head. When lifting the head, a direct pull
should be given to withdraw it evenly up the studs.
Fig. A.3 The correct order of tightening and slackening the cylinder head nuts
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