DS 19 OPERATION No. DS 100-3 : Overhauling an engine 55
TOOLS
d) To prepare the inlet rocker assembly:
1. Dismantle the assembly.
2. Drive out the plugs from the rockershaft by means of a pin punch, passing through the holes for the fixing
screws. Carefully clean the inside of the shaft with a metal pin making sure that the oil hole in the inlet
shafts and the exhaust shafts, as well as those in the rockers and rockershaft brackets are clear.
3. Fit the plugs, tin solder them on assembly.
4. Fit on the inlet rockershaft (previously oiled, the oil holes located towards the bottom and towards the valve)
commencing by the front:
1 long screw (5) fitted with a bearing cap (33) for fixing the spindle,
1 washer,
1 spring,
1 left-hand rocker (34),
1 washer,
1 long screw fitted with a bearing cap,
1 washer,
1 right-hand rocker (35),
1 spring,
1 washer,
1 long screw fitted with a bearing cap,
1 long screw fitted with a bearing cap,
1 washer,
1 spring,
1 left-hand rocker (34),
1 washer,
1 long screw fitted with a bearing cap,
1 washer,
1 right-hand rocker (35),
1 spring,
1 washer,
1 long screw fitted with a bearing cap.
e) Fit the rocker assembly supports (6) (inlet and exhaust) in position. Offer up the inlet rockershaft. Insert the
cylinder head fixing screws.
During this operation, make sure that the rocker push-rods are properly located in the sockets of the adjusting
screws.
f) Put the exhaust rockers in position (see Pl. 3):
1
st
and 3
rd
cylinders : Fit on the shaft (oil holes facing downwards) commencing at the front : 1 spring (37),
the rocker (36), 1 washer (29).
2
nd
and 4
th
cylinders : Fit on the shaft (oil holes facing downwards) commencing at the front : 1 washer (29),
the rocker (38), 1 spring (37).
Fit these assemblies according to their preparation. Put the caps (7) on the studs. Tighten the nuts . . . . . . . . . 12 mm box spanner
NOTE – On cars produced before April, 1956, the exhaust rockershafts are shouldered. On these cars the side
clearance should be 0.3 maximum, the adjustment being carried out by means of washers. If the shouldered
rockershafts require replacing, fit the new type rockershaft (smooth).
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