TM 9-2320-272-24-2
4-20. ROCKER LEVER HOUSING AND PUSH TUBES MAINTENANCE
THIS TASK COVERS:
d. Assembly
a. Removal
e. Installation
b. Disassembly
c. Cleaning and Inspection
PERSONNEL REQUIRED
APPLICABLE MODELS
M939/A1
TWO
REFERENCES (TM)
SPECIAL TOOLS
Rocker lever bushing block and mandrel
TM 9-2320-272-10
(Appendix E, Item 116)
TM 9-2320-272-24P
EQUIPMENT CONDITION
TOOLS
l Parking brake set (TM 9-2320-272-10).
General mechanic's tool kit (Appendix E, Item 1)
l Engine lift eyes removed (para. 4-11).
Inside micrometer (Appendix E, Item 82)
l Intake manifold removed (para. 4-24).
Outside micrometer (Appendix E, Item 80)
Radius gauge, 1/4-in. (Appendix E, Item 136)
l Engine access cover fin cab) removed (para. 4-13).
Bore gauge (Appendix E, Item 136)
GENERAL SAFETY INSTRUCTIONS
Torque wrench (Appendix E, Item 144)
l Keep fire extinguisher nearby when using
Brass drift
drycleaning solvent.
Arbor press
l Drycleaning solvent is flammable and toxic. Do
MATERIALS/PARTS
not use near an open flame.
Three gaskets (Appendix D, Item 187)
Two locknuts (Appendix D, Item 294)
Six O-rings (Appendix D, Item 473)
Three gaskets (Appendix D, Item 172)
Lubrication oil (Appendix C, Item 50)
Prussian blue (Appendix C, Item 54)
Drycleaning solvent (Appendix C, Item 71)
NOTE
Perform step 1 for removing rocker lever housing cover closest to firewall.
Remove two locknuts (5), washers (4), and rubber cushions (3) from left and right cab A-posts (1).
1.
Discard locknuts (5).
NOTE
Assistant will help with step 2.
Turn left and right screw jacks (6) to raise cab above frame (2) 4-5 in. (102-127 mm).
2.
Loosen hose clamps (10) and remove hose (9) from breather (8).
3.
NOTE
Perform step 4 for late model engine only.
Loosen two clamps (14) and remove breather tube (15) from breather (8) and elbow (16).
4.
NOTE
Rocker lever housings are mounted with screw-assembled lockwashers
on late model engine.
Remove fifteen screws (11), three rocker covers (7), and gaskets (12) from rocker lever housings (13).
5.
Discard gaskets (12) and clean gasket remains from mating surfaces.
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