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REPAIR INSTRUCTIONS
Page 213
INSPECTION AND CLEARANCE CHECKS
Refer to Figure 216.
1. Clean and inspect the oil pump housing (4)
for scoring, cracks or other damage. If any of
these conditions exist, replace the oil pump.
2. Check the bushings in the pump housing for
burrs, nicks or cracks.
The bushings are an integral part of the oil pump
housing. If the bushings are damaged, replace
the oil pump housing.
3. Clean and inspect the relief valve spring (12)
for breaks. Replace as necessary.
4. Clean and inspect the plunger (11) outer
diameter for galling and scoring. If galling
and scoring are present, replace the
plunger.
5. Inspect the plunger seating surface for burrs
or nicks. If the seating surface contains burrs
or nicks, repair the seat as follows:
a.
Place valve lapping compound on the
plunger seat.
b.
Insert plunger in the relief valve
housing and rotate plunger against the
seat to smooth seat.
c.
Remove the plunger and clean it.
6. Check the pump idler gear (14) for free play
by spinning it on its shaft. If any binding
occurs, check the housing bore and gear
teeth for burrs, nicks or other damage.
Replace as necessary.
7. Insert the pump gear and shaft, and thrust
washer in the housing; check for free play by
spinning the gear. If any binding occurs,
check the housing and gear teeth for burrs,
nicks or other damage. Replace as
necessary. (The E-Tech™ engine oil pump
utilizes a one-piece shaft with integral
pumping gear.)
Before proceeding with assembly of the pump,
insert the pump gear and idler gear in the
housing. Check end clearance, side clearance
and backlash of the gears as follows.
End Clearance Check
Refer to Figure 217. With the pump gear and idler
gear in place, position a straightedge across the
housing and the face of the gears. Check end
clearance as follows:
r
Low Limit — Run a 0.003-inch (0.076-mm)
thickness gauge between the straightedge
and the gears. The gauge should move
freely without binding. If binding occurs,
check the gears for nicks or burrs. Replace
as necessary.
r
High Limit — Run a 0.007-inch (0.178-mm)
thickness gauge between the straightedge
and the gears. The gauge should be very
tight. If the gauge moves freely, replace the
gears.
217
Figure 217 — Oil Pump Driving/Idler Gear Assembly End
Clearance Check
1. Thickness Gauge
2. Straightedge
3. Pump Gear
4. Pump Idler Gear
5_106_00.bk Page 213 Friday, August 4, 2000 11:17 AM
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