Section V. REPAIR OF OIL PAN AND OIL PUMP
13-25. Description
a. Remove drain plug (1) and gasket (2).
The oil pump is internally mounted at the bottom of the
b. Remove capscrews (3) and oil pan (4). Remove
crankcase and is gear driven by the camshaft Oil is
gasket (5)
drawn from the pan through a screen at pump. 13-26.
c. Remove Capscrew (6) and lockwasher (7) and
Removal Refer to figure 13-5 and remove the oil pan and
lower oil pump from engine.
oil
Note. To remove the oil pump, it is necessary to position
crankshaft rear counterweight away from the oil pump
shaft.
disassemble oil pump as foIlows.
a. Remove gasket (8), cotter pin (9), and inlet
screen (10).
b. Remove
capscrews
(11),
(12),pump cover (13) and gasket (14).
c. With the pump cover removed and the gears id
shaft in place, press against the gears with the thumb to
push the gears away from the outlet side the pump.
Measure the clearance between outside diameter of
gear and bore of the housing. Compare with values
shown in table 1-4. If less an this value, replace body or
shaft. Check the pump shaft clearance in the bore.
Compare with values given in table 1-4. Check backlash
between pump body gears. If this exceeds the amount
specified in table 1-4, replace gears.
d. Lift out idler gear (15) and shaft (16). Drive It pin
(17) and remove drive gear (18) and key 9). Pull drive
shaft and gear (20) from pump body (21).
Figure 13-5. Oil pan and oil pump, exploded view.
1-28. Cleaning
a. Clean all metal parts in dry cleaning solvent
1.
Drain plug
12.
Lockwasher (4)
Federal Specification P-S-661) and dry thoroughly with
2.
Gasket
13.
Pump cover
compressed air.
3.
Capscrew (23)
14.
Gasket
b. Clean all remaining gasket material from arts.
4.
Oil pan
15.
Idler gear
5.
Gasket
16.
Shaft
1-29. Inspection
6.
Capscrew (2)
17.
Pin
Check the drive gear on the oil pump drive shaft for ear,
7.
Lockwasher (2)
18.
Drive gear
cracks or chipped teeth.
8.
Gasket
19.
Key
9.
Cotter pin
20.
Shaft
Note. In no case should a new oil pump drive gear be
10.
Inlet screen
21.
Pump body
used the a proferal type camshaft. The proferal type
11.
Capscrew (4)
gear may be; identified by the darker color.
13-30. Repair and Replacement
a. Refer to checks during disassembly.
b. Refer TM 5-3810-294-34P for repair parts.
13-31. Reassembly and Installation
a. Refer to figure 13-5 and reassemble and install
oil pump and pan as follows.
b. Insert drive shaft and gear (20) into pump body
(21).
13-7
