DS 19 OPERATION No. DS 100-3 : Overhauling an engine 50
TOOLS
e) Clean the cylinder head with great care so as to eliminate all traces of emery in the valve chambers or gas
passages
This operation should always be carried out with very great care. The powdered emery (even in very small
quantities), entering the engine, will cause rapid wear.
f) Calibrating the springs.
(Spring calibration fixture 2420-T, see Pl. 6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring calibration
fixture 2420-
SPRING CHARACTERISTICS
Outer spring Inner spring
Length in mm Load in Kg Length in mm Load in Kg
37 24.2 ± 1.350 24.5 5.250 ± 0.300
28.5 52 ± 2.800 16 11 ± 0.600
g) Fit the valves. Oil the valve stems and the faces. Put the valves in position. Fit the sealing ring (3) on the
inlet valve stems only (see Pl. 3, fig. 2).
For each valve fit (see fig. 3):
One thrust washer (31) for the outer spring.
One shouldered thrust washer (32) for the inner spring.
Fit the valve springs. Make sure that the split cotters retaining the cups are properly seated (spring compressor
1614-T and support 1616-T, see Pl. 5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spring compressor
Fit the exhaust valve springs; fit the spring thrust cap, the split cotter locating cup and the split cotters . . . . . 1614-T
Support 1616-T
NOTE – It is not necessary to fit a sealing ring on the exhaust valves.
h) Remove the filter on the cylinder head cover. Wash the filter element in petrol, blow dry with compressed air,
then dip into engine oil.
Replace the filter.
24 To prepare the oil pump (see Pl. 10)
a) Fit the bush (29) into the support tube (24) using a press.
b) Fit the idler pinion spindle (25) using a press, fit the idler pinion (19) making sure that it turns freely. Place
the fixed pinion (22) in the body of the pump and with a set of feelers and a straight edge resting on the base
of the pump, measure the pinion clearance. This clearance must not exceed 0.05mm.
Remove the pinions.
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