DS 19 OPERATION No. DS 112-4 : Work on the cylinder head. Op. DS 112-4 83
TOOLS
37 Fit the air filter and tube assembly. Tighten the fixing nuts (spring washers). Tighten the clips fixing the piping
on to the carburettor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12-17 mm box spanners
REPLACEMENT OF A VALVE SPRING
NOTE – This operation is only an emergency repair. If the engine has been running for some time with a broken
valve spring, the valve will have to be refaced (see Op. DS 112-3).
Replacement of an inlet valve spring.
38 See paragraphs 26 to 37, this operation.
Replacement of an exhaust valve spring (see Pl. 3).
Removal.
39 Remove the cylinder head cover (see paragraphs 15 to 17, this operation).
40 Remove the rockershaft. Strip the shaft, disengage the washer (29), the rocker (36 or 38), the spring (37) . . . . . . . 12 mm box spanner
41 Provisionally fit the shaft. Put the caps (7) or the distance pieces in position and tighten the nuts . . . . . . . . . . . . . 12 mm box spanner
42 Move the piston, corresponding to the valve, to top dead centre.
Remove the split cotters, the cotter retaining cup, the spring upper thrust cup, the springs (collar MR-4244
and spring compressor 1614-T, see Pl. 17, fig. 4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Collar MR-4244
Spring compressor
1614-T
Assembly
43 Make sure that the spring thrust washers (31 and 32) are in position. Fit the new springs and the upper spring
housing cup.
Compress the assembly (collar MR-4244 and spring compressor 1614-T, see Pl. 17, fig. 4) and fit the split
cotter retaining cup and the split cotters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Collar MR-4244
Spring compressor
1614-T
NOTE – No sealing ring should be fitted on the exhaust valve.
44 Remove the shaft from the cylinder head :
Fit the washer (29), the rocker (36 or 38), the spring (37) or fit an adjusting washer and the rocker in order to
obtain a side clearance of 0.3 mm maximum (cars produced before April, 1956). Fit the rockershaft on its bracket
the lubrication holes located towards the bottom, fit the caps (33) or the distance pieces and tighten the rocker-
shaft fixing nuts. Make sure that the tappet adjusting screws are properly located in the sockets of the push-rods. 12 mm box spanner
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