DS 19 OPERATION No. DS 100-3 : Overhauling an engine 53
TOOLS
c) Connecting rods :
1. The connecting rod bearings can be changed.
2. On engines produced before June 1957, it is necessary to replace the four connecting rods at the same time
(thickness in the centre of the body 19 mm).
3. On engines produced after June 1957, the connecting rods are interchangeable, it is possible to replace only
one connect rod (thickness in the centre of the body 22 mm).
28 To clean the crankshaft :
NOTE – In all circumstances, the crankshaft must be cleaned as indicated below :
a) Remove the crank pin oilway plugs (spanner MR-3462-20 or MR-3462-70, see Pl. 16 fig. 4 and 5) . . . . . . . . Spanner MR-3462-20
or MR-3462-70
b) Thoroughly clean the crank pin bores and the oilways in the journals. Make sure that the connecting rod
lubricating holes in the crank pins are clean. Finally clean with petrol.
c) Fit the plugs, tightening them to 29 ft/lbs (4 m.kg). This tightening torsion is absolutely essential to prevent
the plugs unscrewing when the engine is running.
29 To fit the pistons on the connecting rods :
NOTE – 1. Certain pistons are marked at the top with an arrow and the word “FRONT”.
2. The assembly face of the cap of the connecting rod and of the body is oblique. This direction of assembly
must be observed (see Pl. 2).
3. To allow for the taper of the bores in the piston and of the gudgeon pins, the direction of fitting must be
observed.
The largest bore is marked with a grease pencil on the boss and the smallest diameter of the gudgeon pin
is marked with a grease pencil on the end.
a) Fit a circlip for the gudgeon pin in the side of the boss, not marked with a grease pencil.
b) Bring the pistons to a temperature of 60°C approximately, either in an oil bath or by heating in an oven, so
that the gudgeon pins (first coated with oil) can be inserted by hand (do not interchange the gudgeon pins; they
are weighed and paired with their respective pistons).
c) Fit the other circlip. Make sure that the circlips are seating properly in the groove.
30 To fit the bearings in the flywheel bore :
The circlip being in position in the flywheel, insert the bearing in its housing (use a tube) . . . . . . . . . . . . . . . . . . . Tube :
Internal dia. = 35
External dia. = 41.5
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