ARMY TM 9-6115-670-14&P
6-78
6.31. OIL PUMP ASSEMBLY.
This task covers: a. Test
b. Replace
INITIAL SETUP
Tools
General Mechanic's Tool Kit
(Item 1, Appendix B)
Equipment Conditions
Oil pump gear removed (para 6.21.).
Materials/Parts
Gage, Bearing Clearance (Plastigage)
(Item 7, Appendix F)
Oil Pump Rotor Assembly
Oil Pump Gasket
(Item 9, Appendix J)
TEST
a. Remove oil pump assembly (1, Figure 6-28) (perform step a of REPLACE).
b. Measure the clearance between lobes of inner rotor (3) and outer rotor (2). Clearance should
be between 0.012 and 0.0055 in. (0.03 and 0.14 mm).
c. If clearance is out of tolerance, replace oil pump assembly (1).
d. Measure clearance between outer rotor (2) and pump body. Clearance should be between
0.0028 and 0.0059 in. (0.07 and 0.15 mm).
e. If clearance is out of tolerance, replace oil pump assembly (1).
f. Measure clearance between inner rotor and cover.
(1) Remove inner rotor (3) from cover.
(2) Place a strip of plastigage on rotor (3).
(3) Install rotor (3) in cover.
(4) Install, then remove, oil pump assembly (1) (perform steps a and b of REPLACE).
(5) Remove inner rotor (3) from cover and measure plastigage to find clearance. Clearance
should be between 0.0029 and 0.0053 in. (0.075 and 0.135 mm).
(6) If clearance is out of tolerance, replace oil pump assembly (1).
