Lubricating Oil Pump.

TM 10-3930-621-34

flange, or warping which would interfere with oil pan

shaft extends the length of the pump body extension and

remaining leak proof.

carries a gear at its upper end to mesh with the spiral

(3) Repair or replace as authorized.

drive gear towards the front of the cam shaft.

d. Installation.

(2) The oil is picked up by the set of gears, is

(1) Install new gaskets.

passed around the gears, and forced up the oil pump

(2) Position and support oil pan on flange.

body. The oil enters the engine shortly above the point

(3) Secure pan to flange with bolts (6, fig. 3- 12).

where the body enters the engine block on the left side of

(4) Insert and tighten drain plug (9).

the engine. The lower section of the pump is surrounded

(5) Install engine in truck (para 2-5).

by a baffle to provide protection to the gears.

b. Removal

3-41. Lubricating Oil Pump.

(1) Drain oil from oil pan by removing drain plug

a. Description.

(9, fig. 3-12).

(1) The lubricating oil pump is of the positive

(2) Remove oil pan (para 3-40).

driven gear type, consisting of a single cast oil pump

(3) Remove the two bolts (1, fig. 3-13) holding

body (4, fig. 3-13) with a precision cavity to receive the

the oil pump to the flange of the engine block, and

two pump gears. An idler gear shaft is pressed in place

withdraw pump.

in the pump body. The driver gear

KEY to fig. 3-13:

1. Machine bolt

12.

Key

2. Lock washer

13.

Gear

3. Oil pump assembly

14.

Retaining ring

4. Oil pump body

15.

Gasket

5. Drive gear

16.

Cover

6. Machine screw

17.

Spacing washer

7. Lock washer

18.

Screen

8. Cover baffle

19.

Lock washer

9. Gasket

20.

Screw

10. Drive shaft

21.

Gear

11. Spring pin

22.

Idler shaft

3-18