DS 19 OPERATION No. DS 112-1 : Replacement of a cylinder head or a cylinder head gasket.. Op. DS 112-1 71
ASSEMBLY TOOLS
18 Assemble the cylinder head
Refit the rear plate and exhaust manifold shield (plain and spring washers) . . . . . . . . . . . . . . . . . . . . . . . . 12 mm spanner
12 mm box spanner
19 To fit the cylinder head.
Remove the washers holding the cylinder barrels.
Fit the cylinder head gasket, previously oiled with boiled linseed oil (early models). The new varnished
type gaskets should be fitted dry. Place the crimping of the gasket towards the cylinder barrel. Make sure
that the cylinder head dowels are in position. Centre the gasket. Fit the cylinder head. Pay attention to the
rockershaft oil feed pipe and the inlet manifold drain pipe. On the early models, fit the two end screws,
exhaust side, in order to centre the cylinder head gasket.
Disengage the rockers slightly and fit the push-rods (the exhaust push-rods are longer).
Fit the caps or distance pieces (early cars) and tighten the nuts on the studs of the exhaust valve rockers.
Fit the cylinder head fixing screws, then tighten (torsion spanner 2471-T, see Pl. 7, fig. 2).
1
st
tightening 21.75 ft/lbs (3 m.kg).
2
nd
tightening 43.5 ft/lbs (6 m.kg).
The torsion of tightening is of the greatest importance. Do not exceed the tightening torsion of 43.5 ft/lbs
(6 m.kg). Observe the order of tightening as indicated on Pl. 7 fig. 1. During the tightening, make sure that 12 mm box spanner
the spherical ends of the tappet adjusting screws are properly seated in the sockets on the rocker push-rods. Torsion spanner 2471-T
14 mm socket
NOTE – It is an obligatory procedure to retighten the cylinder head when a distance of 300 miles (500 km)
has been covered. It is imperative to proceed in the following manner :
1. Work on the screws one by one.
2. Loosen each screw, then tighten to 43.5 ft/lbs (6 m.kg) (torsion spanner 2471-T).
3. After a few thousand miles, proceed to retighten the cylinder head following the same conditions.
20 Connect the rockershaft oil feed . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
21 Put the driving belts in position in the grooves of the driving pulleys of the water pump and dynamo. Connect
the dynamo tie-rod, tension the belts (see Pl. 35). Tighten the dynamo fixing screws. Tighten the tie-rod
screw (plain and spring washers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
14 mm spanner
Lever MR-4208
Torsion spanner 2472-T
22 Connect the feed pipe to the low pressure pump (spanner 2220-T, see Pl. 72, fig. 4) . . . . . . . . . . . . . . . . . . . . Spanner 2220-T or
14 mm spanner
23 Connect the high pressure pump tie-rod to the water pump (spring washer) . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
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