TM-9-2320-361-34
2-1/2-TON, 6x6, M44A2 SERIES TRUCKS (MULTIFUEL)
TECHNICAL MANUAL; DIRECT SUPPORT AND GENERAL SUPPORT MAINTENANCE
MAY 1992
TM-9-2320-361-34 - Page 83 of 764
TM9-2320-361-34
3-10. VALVE TAPPETS MAINTENANCE
THIS TASK COVERS:
a.
Removal
c. Installation
b. Cleaning and Inspection
INITIAL SETUP
APPLICABLE MODELS
All
TOOLS
General mechanic’s tool kit
(Appendix B, Item 1)
MATERIALS/PARTS
Lubricating oil, OE/HDO 30
(Appendix C, Item 13)
REFERENCES (TM)
TM 9-2320-361-10
TM 9-2320-361-34P
TM 9-2815-210-34-2-2
EQUIPMENT CONDITION
●
Parking brake set (TM 9-2320-361-10).
●
Air
compressor
support removed (front only)
(para. 3-15).
●
Oil
cooler
and
oil
cooler filter housing removed,
front only (para. 3-14).
●
Tappet chamber cover removed (rear only)
(para. 3-9).
●
Rocker arms and pushrods removed (para. 3-7).
CAUTION
Camshaft and tappets are a matched set. All tappets removed must
be tagged for installation. Failure to do this may result in damage
to tappets or camshaft.
NOTE
Sludge from engine oil may build upon external surfaces of tappets.
When this condition exists, drycleaning solvent maybe applied to
tappets while working tappets up and down to loosen sludge and aid
removal.
Remove and tag twelve tappets (2) from tappet bores (1) in engine block (3).
b. Cleaning and
Inspection
1. For general cleaning instructions, refer to para. 2-8.
NOT E
Normal tappet and camshaft lobe wear is indicated by a slight inward
coning or dishing effect of the cam contact surface on tappets.
2. Inspect tappets (2) for coned, scored, or grooved cam contact. Minor surface coning is acceptable
when cam contact surface is free of grooving and scoring, otherwise replace.
3. Inspect machined sides of twelve tappets (2) for grooving or scoring. Replace if defective.
4.
If tappets (2) need replacement, inspect twelve tappet bores (1) and lobe surfaces of camshaft. Refer
to TM 9-2815-210-34-2-2 for inspection.
3-32
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