DS 19 OPERATION No. DS 112-4 : Work on the cylinder head. Op. DS 112-4 79
TOOLS
Assembly (see Pl. 1).
7 To assemble the rockershaft (see Pl. 3) :
Fit the plugs to the shaft (40) and tin solder.
Place in position on the shaft (previously oiled, and with the lubrication holes facing downwards, valve side,
(see fig. 3), commencing from the front :
1 left-hand rocker (34).
2 washers (38).
1 right-hand rocker (35).
1 spring (39).
2 washers
1 spring (39)
1 left-hand rocker (34).
2 washers (38).
1 right-hand rocker (35).
1 spring (39).
1 washer (38).
1 long screw (5) together with its cap (33).
Hold each assembly of spring (39) and washer (38) with a yoke (yoke MR-4158-20, see Pl. 5, fig. 3) in order to
avoid tightening the caps (33) on the washers (38), this can cause damage to the shaft . . . . . . . . . . . . . . . . . . . . Yoke MR-4158-20
8 Make sure that the cylinder head is properly located on the locating dowels and that the intermediate supports
(41) are in position on the cylinder head.
Fit the rockershaft and rear brackets assembly. Fit the shaft in position on the other brackets. Fit the spring
(39) and the washer (38) of the first rocker. Fit the first five fixing screws (5) together with their cap (33).
Offer up the rockershaft fixing screw and the cylinder head fixing screws, right-hand side.
Remove the retaining yoke from the assembly of the spring(39) and washer (38).
Tighten the cylinder head fixing screws (torsion spanner 2471-T, see Pl. 7, fig. 2):
1st tightening 21.75 ft/lbs (3 m.kg) 2nd tightening 43.5 ft/lbs (6 m.kg).
NOTE – It is an obligatory procedure to retighten the cylinder head when a distance of 300 miles (500 km) has
been covered, then 1,250 miles (2000 km) (see Op. DS 112-1, paragraph 19, NOTE).
The tightening torsion is of great importance. Observe the order of tightening (see Pl.7, fig. 1).
During the tightening, make sure that the tappet adjusting screws are properly located in the sockets of the
push-rods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Torsion spanner 2471-T
14 mm socket
9 Fit the 4
th
rockershaft. Tighten the fixing nuts, inserting the caps or distance pieces . . . . . . . . . . . . . . . . . . . . . . . . 12 mm box spanner
10 Adjust the valve rocker clearance, 0.008 ins (0,20 mm) for the inlet and 0.010 ins (0,25 mm) for the exhaust
(see Op. DS 112-0).
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