DS 19 OPERATION No. DS 120-1 : Work on the timing gear. Op. DS 120-1 86
TOOLS
b) Turn back the lockwashers and unscrew the pinion fixing nuts (spanner 1731-T for the camshaft nut, see Pl. 15,
fig. 3 and spanner 1667-T for the crankshaft nut, see Pl. 15, fig. 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Spanner 1731-T
Spanner 1667-T
c) Remove the setting gauge 1680-T
d) Remove the timing chain and pinion assembly from the engine.
Assembly.
4 Place the two pinions of the crankshaft and camshaft on a bench.
Align the reference on the two pinions. A straight edge passing through the centre lines of the two pinions must
pass through the reference mark (punch mark on a tooth) of the camshaft pinion and through the reference mark
(punch mark between two teeth) of the crankshaft pinion. One can also use the setting gauge 1680-T (see Pl. 15,
fig. 2), for alignment of the reference marks.
Then fit the chain on the two pinions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Setting gauge 1680-T
5 To fit the timing chain and pinion assembly :
a) Without displacing the pinions, offer up the assembly on the engine.
b) Rotate the camshaft by means of its pinion, so that the keyways on the pinions and shafts correspond.
c) Fit the chain and pinion assembly, making sure that the keys are properly located on the camshaft and the
crankshaft.
6 Retain the crankshaft by means of the setting gauge 1680-T (see Pl. 15, fig.2).
Tighten the camshaft nut to 110 ft/lbs (15 m.kg) (spanner 1731-T, see Pl. 15, fig. 3) (insert a lockwasher).
Tighten the crankshaft nut to 145 ft/lbs (20 m.kg) (spanner 1667-T, see Pl. 15, fig. 1) (insert a lockwasher).
Remove the setting gauge 1680-T and turn down the lockwashers on the nuts . . . . . . . . . . . . . . . . . . . . . . . . . . Setting gauge 1680-T
Spanner 1731-T
Spanner 1667-T
7 Fit the timing cover inserting a gasket. Tighten the fixing screws to 11 ft/lbs (1.5 m.kg) and fit a brass washer
under the head of the three screws projecting inside the timing cover or smear the base of the screw head with
Hermetic (new type screws have a circular base). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
8 Fit the engine-gearbox assembly on the vehicle (see Op. DS 100-1).
REPLACEMENT OF A CAMSHAFT
Removal (see Pl. 1).
9 Remove the engine-gearbox assembly (see Op. DS 100-1).
10 Remove the sump, distributor and oil pump (see Op. DS 111-4, paragraphs 5 to 9).
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