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(f) Before completing reassembly check the bumping clearance (see
Technical Data) as follows:
(i) Insert a length of lead wire or soft solder through the injector port
in the cylinder head. Pull through sufficient to allow
approximately 1 in (25mm) to be positioned flat on the cylinder
head between the inlet and exhaust valves. Wind any surplus
wire around the injector studs.
(ii) Replace the cylinder head and tighten the nuts in the correct
sequence with a torque spanner. See (g) below
(iii) Turn the engine over TDC and (hen carefully remove the wire.
(iv) Measure the thickness of the now flattened wire with a micro-
meter If the clearance is outside the limit, adjust by changing
one or more of the shims at the base of the cylinder, and
recheck the bumping clearance
(g) As the engine is fitted with long through studs from crankcase to
cylinder head it is MOST IMPORTANT that the cylinder head nuts are
correctly tightened and in the right sequence. Tighten the cylinder head
nuts using a torque spanner set to the figure shown under Technical
Data. Proceed as follows:
(i) Screw down each cylinder head nut until finger tight.
(ii) Tighten each nut a quarter of a turn at a time working diagonally
across the cylinder head until all the nuts are tight.
(h) Adjust the valve rocker clearances (see Technical Data).
(i) Tighten the injector stud nuts using a torque spanner set to the figure
shown under Technical Data (See 'To replace fuel injector'.)
(j) Run the engine for at least one hour and allow to cool
(k) When cold. retighten the cylinder head nuts and readjust the valve
rocker clearances.
(l) After approximately 20 hours normal running check the cylinder head
nuts again for tightness.
37. To adjust valve rockers (Fig. 6)
(a) To adjust the clearance, set the engine with valves closed (TDC of
firing stroke), loosen the locknut (A) and turn the rocker adjusting
screw (B) with a screwdriver Measure the gap with a feeler gauge. and
when the correct setting is obtained (see Technical Data) retighten the
locknut Recheck the gap
(b) IMPORTANT. The cylinder head must be firmly bolted in position with
all nuts finally tightened, before the rocker clearances are adjusted
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