5-101.bk Page 58 Friday, March 17, 2006 11:05 AM
200 BENCH PROCEDURES 6
5
7 8
4
10
3 1 9 10 2
14 11
12
13
200345a
Figure 5-70 — Lubrication Oil Pump 1. Self-locking nut 2. Washer 3. Drive gear 4. Housing 5. Key 6. Pumping gear and shaft assembly 7. Oil pump housing cover
Inspection Refer to Figure 5-70. 1. Clean and inspect oil pump housing (4) for scoring, cracks or other damage. If any of these conditions exist, replace oil pump. 2. Check bushings in oil pump housing for burrs, nicks, or cracks.
The bushings are an integral part of the oil pump housing. If bushings are damaged, replace oil pump housing.
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8. Gasket 9. Inlet flange plate 10. Capscrews 11. Plunger 12. Relief valve spring 13. Relief valve cap 14. Idler gear
3. Clean and inspect relief valve spring (12) for breaks. Replace as necessary. 4. Clean and inspect plunger (11) seating surface for burrs or nicks. If seating surface contains burrs or nicks, repair seat as follows: a.
Place valve lapping compound on plunger seat.
b.
Insert plunger in relief valve housing and rotate plunger against seat to smooth seat.
c.
Remove plunger and clean.
5. Check oil pump idler gear (14) for free play by spinning it on its shaft. If any binding occurs, check housing bore and gear teeth for burrs, nicks, or other damage. Replace as necessary.
