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 first, to allow for normal expansion of engine parts during the
threaded holes in cylinder block. Install the setscrews (16)
warm-up period. This will insure a valve setting that is close
and tighten to a torque of 15-20 ft lbs.
enough to the specified clearance to prevent damage to the
(i) Be sure the machine keys (11) are in
engine when it is started.
shafts.
(k) Place a block of wood between the
(2) Adjusting valve clearance-engine cold.
balance weights to block them from turning, then install lock-
(a) Clean any loose dirt from exterior of the
washers (8 and 29) and nut (9 and 30). Tighten nuts to a
cylinder head. then remove the valve rocker cover (para 5-
torque of 300-325 ft lbs. Remove wood block.
(l) Make one last check to assure that all
(b) Place the governor fuel rod in NO FUEL
timing marks are aligned and teeth of gears are meshed
position.
correctly, then install front end cover and the flywheel.
(c) Rotate the crankshaft manually, or with
Tighten balance weight cover capscrews in the numerical
the starting motor, until the injector cam follower is fully
sequence shown on figure 5-26.
depressed on the cylinder to be adjusted.
(m) Reconnect power generator (par 5-29).
(n) Install cylinder head (para 5-3).
CAUTION
(o) Install accessories (para 5-2).
When using a wrench on crankshaft bolt at
d. Maintenance and Adjustment of Valve Clearance.
front of engine to manually turn the engine
(1) General.
Smooth,
efficient
engine
over. do not turn in a left hand rotation.
operation requires proper valve clearance adjustment at
This will remove the bolt.
normal operating temperatures. When the cylinder head has
been disassembled (para 5-3), or the exhaust valves have
(d) Loosen the pushrod locknut (6, fig. 5-
been reconditioned or replaced (b.(3) above), or the valve
operating mechanism has been disturbed in any way, the
valve clearance must be adjusted. Adjust to the cold setting
5-35
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