TM 5-3805-293-23-2
0032
ENGINE VALVE LASH INSPECT/ADJUST CONTINUED
C AU T I O N
If valve lash requires adjustment several times in a short period of time, excessive wear
exists in a different part of engine. Find problem and make necessary repairs to prevent
more damage to engine. Not enough valve lash can be cause of rapid wear of camshaft
and valve lifters. Not enough valve lash can indicate seats for valves are worn.
Valves become worn due to following causes:
Fuel injection nozzles operate incorrectly
Excessive dirt and oil are present on filters for inlet air
Load capacity of engine is frequently exceeded
C AU T I O N
Too much valve lash can cause broken valve stems, springs, and spring retainers. This
will produce emissions in excess of correct specification.
N OT E
If camshaft and valve lifters show rapid wear, look for fuel in lubrication oil or dirty
lubrication oil as a possible cause.
Too much valve lash can be an indication of following problems:
Worn camshaft and valve lifters
Worn rocker arms
Bent pushrods
Broken socket on upper end of a pushrod
Loose adjustment screw for valve lash
N OT E
An adjustment is not necessary if measurement of valve lash is in an acceptable range.
Temperature of engine does not change valve lash setting.
Change 1
0032-14