Inspection - Mack E7 Service Manual

5-101.bk Page 58 Friday, March 17, 2006 11:05 AM
3
1
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.
Page 5-58
200 BENCH PROCEDURES
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5
4
14
2
Figure 5-70 — Lubrication Oil Pump
10. Capscrews
11. Plunger
12. Relief valve spring
13. Relief valve cap
14. Idler gear
9
12
13
8. Gasket
9. Inlet flange plate
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.
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8
10
10
11
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