TM 5-3805-290-23-2
INTAKE/EXHAUST VALVE LASH ADJUSTMENT - CONTINUED
0155 00
INSPECTION/ADJUSTMENT - CONTINUED
4.
Too much valve lash can cause broken valve stems, springs, and spring retainers and can be an indication of these prob-
lems:
a.
Camshaft and valve lifters are worn.
b.
Rocker arms are worn.
c.
Pushrods are bent.
d.
Socket on upper end of pushrod is broken.
e.
Screw for valve lash is too loosely adjusted.
5.
If camshaft and valve lifters show rapid wear, look for fuel in lubrication oil or dirty lubrication oil as possible cause.
6.
An adjustment is NOT NECESSARY if measurement of valve lash is in acceptable range. Check valve lash while
engine is stopped. Temperature of engine does not change valve lash setting.
7.
If measurement is not within the acceptable clearance, adjustment is necessary. Refer to Table 1.
WARN I N G
Accidental machine starting can cause injury or death to personnel working on machine.
To avoid accidental machine starting, turn battery disconnect switch to OFF position and remove key. If
machine is not equipped with a battery disconnect switch, disconnect battery cables from battery and tape
battery clamps.
Place a DO NOT OPERATE tag at battery disconnect switch location to inform personnel that machine is
being worked on.
N OT E
Alternator pulley may be used to rotate engine.
8.
Rotate crankshaft in direction of engine rotation until inlet valve of No. 6 cylinder has opened and exhaust valve of No.
6 cylinder has not completely closed. Engine is now at TC compression stroke (WP 0002 00).
Table 1.
TC COMPRESSION STROKE
INLET VALVES
EXHAUST VALVES
Valve Lash
0.008 in. (0.20 mm)
0.018 in. (0.45 mm)
Cylinders
1-2-4
1-3-5
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