Figure 3-7. Engine oil pump, exploded view.

(2) Remove slotted pipe plug (26, fig. 3-13);

(3) Remove the lock nut (1, fig. 3-7) holding

with a 5/32-inch Allen wrench, remove the setscrew

the oil pump drive gear (2) to the shaft (14).

(27) locking the oil pump in position.

11. Pin

1. Lock nut

12. Gear

2. Drive gear

13. Key

3. Screw

4. Lock washer

14. Drive shaft

15. Gear

5. Screen

16. Shaft

6. Screw

17. Body

7. Lock washer

18. Cotter pin

8. Screw

9. Cover

19. Spring

20. Ball

10. Cover gasket

Figure 3-7. Engine oil pump, explodcd view.

(b) Take care when removing the cotter

(4) Using a soft drift, drive the oil pump shaft

pin (18); it retains the pressure relief valve spring (19).

(14) through the drive gear (2). You can now remove

the oil pump by pulling it toward the center of the

(6) Do not remove the gear (12) from the drive

shaft unless it is worn or damaged.

crankcase. Remove key (13).

b. Cleaning and Inspection.

(5) Disassemble the oil pump as shown in fig-

(1) Discard and replace all gaskets.

ure 3-7, taking note of the following:

(2) Clean all parts with cleaning solvent (fed.

(a) You may need to tap the oil pump

cover (9) with a plastic hammer to free it from the

spec. P-D-680); dry thoroughly.

pump body (17).

(3) Inspect the strainer screen (5, fig. 3-7) for