ARMY TM 9-6115-670-14&P
5-129
5.36. ROCKER ARM ASSEMBLY.
This procedure covers: a. Test
b. Repair
c. Replace
INITIAL SETUP
Tools
General Mechanic's Tool Kit
(Item 1, Appendix B)
Inside Micrometer Caliper
(Item 42, Appendix B)
Outside Micrometer Caliper
(Item 43, Appendix B)
Torque Wrench
(Item 2, Appendix B)
Equipment Conditions
Remove the air filter cleaner tube assembly.
Valve head cover removed (para 4.64.).
MASTER ON/OFF switch on APU controller set to
OFF.
Materials/Parts
Rocker Arm Assembly
TEST
a. Remove rocker arm assembly (steps a - b of REPLACE).
b. Disassemble rocker arm assembly:
(1) Remove one bolt, thrust spring, lock washer, and flat washer (1, Figure 5-28) from end of
rocker arm assembly.
(2) Remove first rocker arm (2), rocker arm bracket (3), second rocker arm (5), and first
rocker arm spring (6) from rocker arm shaft (7).
(3) Repeat step 2 for remaining rocker arms, brackets, and spring.
c. Use inside micrometer caliper to measure the inside diameter (ID) of the first rocker arm (2). ID
should be between 0.41339 in. (10.5 mm) and 0.41410 in. (10.518 mm).
d. Use outside micrometer caliper to measure the outside diameter (OD) of the rocker arm shaft
(7). OD should be between 0.41233 in. (10.473 mm) and 0.41276 in. (10.484 mm).
e. Calculate oil clearance. Oil clearance should be between 0.00063 and 0.00177 in. (0.016 and
0.045 mm).
f. If oil clearance exceeds allowable limit, replace rocker arm.
g. Recalculate the oil clearance. If the oil clearance still exceeds allowable limit, replace rocker
arm shaft.
g. Repeat steps c - f for remaining rocker arms.
