DS 19 OPERATION No. DS 100-3 : Overhauling an engine 59
TOOLS
42 Turn the engine over. Support it on a stand (stand MR-3053-160. See Pl. 18, fig. 2) . . . . . . . . . . . . . . . . . . . . . . Stand MR-3053-160
43 To adjust the valve clearance :
This clearance should be .008 ins (0.20 mm) for the inlet and .010 ins (0.25 mm) for the exhaust. Adjust the valves
of one cylinder, the piston being at top dead centre, end of compression. The valves of a cylinder opposite are
then in balance, that is to say, inlet valve at the commencement of admission, exhaust valve at the end of exhaust.
Adjust the valves of :-
1
st
cylinder, the valves of the 4
th
cylinder being in balance.
3
rd
cylinder, the valves of the 2
nd
cylinder being in balance.
4
th
cylinder, the valves of the 1
st
cylinder being in balance
2
nd
cylinder, the valves of the 3
rd
cylinder being in balance.
44 Oil the valve springs and the sockets of the rockers. Put in position, the metal cups (3) and the seals (4) on the
sparking plug tubes.
Fit the cylinder head cover, the gasket is stuck only to the cover with Hermetic. Make sure that the gasket
and the bearing face of the cylinder head cover are properly clean.
Tighten the nuts (leather and plain washers) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
45 Fit the engine side support arms (spring washers under the heads of the screws) . . . . . . . . . . . . . . . . . . . . . . . . . . . .
14–17 mm box spanners
46 Fit the cylinder head lubrication tube, using a double leather joint when securing to the cylinder head and two
fibre joints when securing to the crankcase.
47 Paint the unit.
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