TM 5-6115-593-12
TO 35C2-3-463-1
LEGEND
1.
Bolts
5.
O-ring
2.
Washers
6.
Bolts
3.
Clamp
7.
Washers
4.
Tube
8.
O-rings
Figure 4-58. Water Manifold
(3) Inspect end of rocker arm adjusting screw
and end of rocker arms. If they are worn,
the
rocker
arm
assemblies
must
be
replaced.
b.
Adjustment.
(See
Figure
4-59.)
Correct
clearance (valve lash) between end of intake
valve stem, exhaust valve stem, and related
rocker arms, is very important in diesel engine
performance because of high compression
developed within the cylinders. Insufficient
valve lash will cause loss of compression,
misfiring, and eventually lead to burning of
valves and valve seats. Excessive valve lash
will result in faulty engine operation, valve lifter
noise, and cause rapid wear on the valve
operating mechanism. With engine normal
operating
temperature
or
160°
F
(71°C)
minimum, valve lash for both intake and
exhaust valves is 0.014-0.027 inch (0.36-0.69
mm). Adjust injector tappet (the middle lever in
each group of three levers) by loosening
adjusting screw one turn. Using a torque
wrench, tighten adjusting screw to 70 inch-
pounds (7.96 joules) and tighten locknut to 40 to
45 ft.-pounds. After any mechanical work has
been done that may have disturbed the valve
lash adjustment, set valves "cold" at 0.018 inch
(0.45 mm) clearance so engine can be run and
allowed to warm to normal operating
4-125
