DS 19 OPERATION No. DS 120-1 : Work on the timing gear.. Op. DS 120-1 85
PARTICULAR POINTS
Replacement of a timing chain or timing pinions.
On assembly align the reference marks (punch marks). A straight line passing through the centre-line of the pinions.
Tighten the crankshaft pinion nut to 145 ft/lb (20 m.kg) and the camshaft pinion nut to 110 ft/lb (15 m.kg) (lockwashers).
Replacement of a camshaft.
Assembly.
12 Insert a ring seal in the front groove of the camshaft.
Tighten the screws of the rear thrust flange to 7.5 ft/lb (1 m.kg) (lockwashers).
18 Tighten the cylinder head fixing screws: 1st tightening 21.75 ft/lb (3 m.kg), 2nd tightening 43.5 ft/lb (6 m.kg) (do not exceed this tightening
torsion and observe the sequence of tightening indicated on Pl. 7. Make sure that the push-rods are correctly positioned).
19 Adjust the valve rocker clearance: inlet 0.008 in (0.20 mm) and exhaust 0.010 in (0.25 mm) (see Op. 112-0).
27 Fill up the engine with oil: 7 pints (4 litres) S.A.E. 20 engine oil.
Replacement of a tappet.
Removal.
37 It is preferable to replace the tappets one at a time (extractor 1608-T, see Pl. 17, fig. 1).
Refitting.
40 Tighten the cylinder head: see paragraph 18 above.
Adjust the valve rocker clearance: see paragraph 19 above.
48 Refill with water, the heater control vane open (bleed).
49 Adjust the slow running (see Op. DS 142-0).
TOOLS
REPLACEMENT OF A TIMING CHAIN OR TIMING PINIONS
Removal.
1 Remove the engine-gearbox assembly (see Op. DS 100-1).
2 Remove the timing case . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
3 To remove the timing chain and pinion assembly :
a) Retain the pinions of the crankshaft and camshaft by means of the setting gauge 1680-T (see Pl. 15, fig. 2) . . . . Setting gauge 1680-T
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