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 TM 55-1905-221-14-1
4-40.
CYLINDER HEAD AND EXHAUST VALVES.
Location/Item
Action
Remarks
The correct exhaust valve clearance at normal engine operating temperature is important for smooth, efficient
operation of the engine. Whenever the cylinder head is overhauled the exhaust valves are reconditioned or replaced. If
the valve operating mechanism is disturbed in any way, the valve clearance must first be adjusted to the cold setting to
allow for normal expansion of the engine parts during the engine warm-up period. This will insure a valve setting that is
close enough to the specified clearance to prevent damage to the valves when the engine is started.
This task covers:
a. Inspection
b. Adjustment
INITIAL SETUP
Equipment
Condition
Paragraph
Condition Description
Test Equipment
Rocker Cover Removed
NONE
Tools and Special Tools
Special Environmental Conditions
General Mechanic Tool Kit
NONE
Feeler Gage (J9708)
Material/Parts
General Safety Instructions
NONE
NONE
Personnel Required
Troubleshooting Reference
Operator-Crew
NONE
(MOS 61B & C)
References
Approximate Time Required (minutes)
NONE
Inspection
60
Adjustment
90
4-137
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