TM 5-1940-322-24
0153 00
ENGINE OIL PUMP MAINTENANCE (Contd)
CLEANING AND INSPECTION (Contd)
NOTE
The feeler gauge must be on the outside diameter and down.
7.
Using feeler gauge, measure tip clearance between the gerotor drive (7) and gerotor planetary (8). For
measurements, refer to table 1, Engine Oil Pump Wear Limits. Replace oil pump (1) if worn past
limits.
8.
Using straightedge and feeler gauge, measure chamfer of gerotor drive (7) and gerotor planetary (8) to
body bore (9). For measurements, refer to table 1, Engine Oil Pump Wear Limits. Replace oil pump (1)
if worn past limits.
9.
Using feeler gauge, measure clearance of gerotor planetary (8) to body bore (9). For measurements,
refer to table 1, Engine Oil Pump Wear Limits. Replace oil pump (1) if worn past limits.
10.
Using dial indicator, measure backlash of idler gear (3) and oil pump drive gear (4). For
measurements, refer to table 1, Engine Oil Pump Wear Limits. Replace oil pump (1) if worn past
limits.
Table 1. Engine Oil Pump Wear Limits.
WEAR LIMITS/CLEARANCE
ITEM
ITEM/POINT OF MEASUREMENT
NO.
INCHES
MILLIMETERS
7, 8
Tip Clearance
0.007
0.1778
7, 8, 9
Gerotor Drive/Gerotor Planetary to Chamfer
0.005
0.127
8, 9
Gerotor Planetary to Body Bore
0.015
0.381
3, 4
Gear Backlash
0.0030.015
0.0800.381
ASSEMBLY
Install oil pump back plate (6), gerotor planetary (8), and gerotor drive (7) on oil pump (1).
INSTALLATION
1.
Lubricate oil pump (1) with engine oil.
CAUTION
Ensure idler gear pin is installed in the locating bore in the
cylinder block. Failure to comply may result in damage to
equipment.
2.
Install oil pump (1) on cylinder block (2) with four screws (5).
a. Tighten screws (5) to 44 lb-in (5 Nm) in star pattern.
b. Tighten screws (5) to 18 lb-ft (24 Nm) in star pattern.
3.
Install gear housing cover (WP 0155 00).
4.
Install engine drivebelt (WP 0086 00).
5.
Install belt guard (WP 0085 00).
6.
Install coolant reservoir and hoses (WP 0066 00).
7.
Close engine hatches (TM 5-1940-322-10).
0153 00-4
