Perkins 4.108 Workshop Manual page 38

CYLINDER HEAD-E.8
E20
4. Fit the push rods in their locations then carefully
fit the rocker shaft assembly, noting that the valve
adjusting screw ends locate in their respective
push rod cups and the oil feed to the rocker shaft
is located correctly.
5. Locate the oil feed pipe nut just finger tight at this
stage, then evenly tighten the rocker shaft bracket
securing nuts to a torque of 12 - 15 Ibf It (1,7
2 kgf m) now tighten the oil feed pipe nut.
When correctly located the oil feed pipe will be
as shown in Fig. E.2.
NOTE: If the oil feed pipe nut is tightened before
the rocker shaft bracket securing nuts, :he pipe
will either be strained or the olive pulled off the
feed pipe.
E22
E21
6. Adjust the valve clearances to 0.012 in (0.3 mm)
as follows:-
Turn the engine so that the valves of No.1 cylinder
are in the position of 'valve overlap', i.e. the period
between the opening of the inlet valve and the
closing of the exhaust valve. In this position, adjust
the clearances of No. 4 cylircder valves: similarly
with the valves of No. 3 cylinder in the overlap
position, adjust the valves of No. 2 cylinder. With
valves of No. 4 in the overlap pOSition, adjust the
valves of No. 1 cylinder and finally with valves of
No.2 cylinder in overlap position, adjust valves on
NO.3 cylinder.
7. Replace the dynamo or alternator adjusting link
and tension the fan belt (Refer to Page M.1
i.