DS 19 OPERATION No. DS 112-1 : Replacement of a cylinder head or a cylinder head gasket. Op. DS 112-1 69
PARTICULAR POINTS
Removal.
15 Disengage the push-rods by lifting the inlet rockershaft slightly.
16 Remove the cylinder head fitted with the inlet rockershaft.
Assembly.
19 Place the cylinder head gasket in position with the crimping towards the cylinder barrels. The old type joints should be smeared with
linseed oil before fitting, the new type joints (varnish) are fitted dry.
Fit the cylinder head, make sure that the two locating dowels are on the cylinder block. The early type engines are not fitted with locating
dowels; fit the two end screws, exhaust side, in order to centre the cylinder head gasket.
Slightly raise the inlet rockershaft in order to fit the pushrods.
Tighten the cylinder head fixing screws; 1st tightening 21.75 ft/lb (3 m.kg), 2nd tightening 43.5 ft/lb (6 m.kg) (do not exceed this tightening
torsion and observe the order of tightening indicated on Pl. 7. Make sure that the pushrods are correctly positioned).
28 Tighten the fan fixing screws to 6.5 to 7.25 ft/lb (0.9 – 1 m.kg). Do not exceed this tightening torsion.
32 Adjust the valve clearances to: inlet 0.008 in (0.20 mm), exhaust 0.010 in (0.25 mm) (see Op. DS 112-0).
33 The cylinder head cover joint should be stuck with Hermetic on the cylinder head cover only (note the direction of fitting).
34 Fill the water-cooling system with water, with the heater control open (bleed).
35 Adjust the idling (see Op. DS 142-0).
TOOLS
REMOVAL
1 Drain the cooling system. Retain the water which contains anti-freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 mm spanner
2 Remove the air filter and pipe assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 - 17 mm box spanners
3 Disconnect the leads from the sparking plugs
4 To remove the carburettor (see Op. DS 142-1).
Remove the screw from the plate fixing the accelerated idling pipe on the hot spot cover plate on the inlet
manifold . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 mm spanner
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