DS 19 OPERATION No. DS 112-4 : Work on the cylinder head. Op. DS 112-4 78
Replacement of a valve spring.
This operation is only an emergency repair. If the engine has been running for some time, the valve will have to be refaced.
For the dismantling and assembly proceed as indicated in paragraph 29 (replacement of sealing ring).
Cleaning a cylinder head filter.
This operation should be carried out after every 3,700 miles (6,000 km) approximately. Wash the filter element in petrol, then immerse in
engine oil and refit.
TOOLS
REPLACEMENT OF AN INLET ROCKERSHAFT ASSEMBLY
Removal (see Pl. 1).
1 Drain the radiator and cylinder block, retain the water which contains anti-freeze . . . . . . . . . . . . . . . . . . . . . . . . . . 21 mm spanner
2 Remove the air filter and tube assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17 mm box spanners
3 Disconnect the lead from the sparking plugs. Remove the rubber and bakelite caps from the sparking plug tubes.
Remove the 4
th
sparking plug (spanner 1603-T, see Pl. 16, fig. 7) as a precautionary measure . . . . . . . . . . . . . . Spanner 1603-T
4 Remove the cylinder head cover, the sealing joint (4) and the cup (3) of the 4
th
sparking plug tube. In order to
remove the inlet rockershaft assembly, it is necessary to remove the last exhaust rockershaft bracket so that the
last fixing screw of the inlet rockershaft and the cylinder head can also be removed.
Unscrew the fixing screws (5) of the inlet rockershaft, and the screws fixing the cylinder head, right-hand side.
Remove the 4
th
rockershaft, the first five screws fixing the inlet rockershaft and their caps, the washer and the
spring of the first inlet rocker . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-14 mm box spanners
5 Remove the inlet rockershaft assembly and rear bracket (6) of the inlet and exhaust rockershafts.
6 To strip the rockershaft (see Pl. 3).
Remove the fixing screw (5) and its cap (33), the springs (39), the rockers (34 and 35).
Drive out the plugs of the shaft (40) with a in punch passing through the holes for the fixing screws. Carefully
clean the inside of the shaft with a metal pin and make sure that the lubrication holes in the shaft are clear.
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