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6Al-10
1977 PONTIAC SERVICE MANUAL
2. Remove the three front oil pan bolts that secure into
the oil pump.
3. Remove the bolts and stud securing oil pump assembly
to the cylinder case.
Inspection
Fig. 6A1-19 Oil Pump Pressure Regulator
1. Clean gasket surfaces; then wash parts in an approved
cleaning solvent and blow out
all
oil passages.
2. Check pressure regulator for free operation; replace
if necessary (Fig. 6A1-19).
3. Inspect pump gears for nicks, broken parts and other
damage.
4. Check clearance between outside diameter of driven
gear and pump; clearance should be .003
-
.006
(Fig. 6A1-20).
5. Check clearance between outside diameter of drive
gear and crescent; clearance should be .002
-
.009
(Fig. 6A1-
2 1).
6. Check clwance between inside diameter of driven
gear and pump crescent; clearance should be
.006
-
.014 (Fig.
6A1-22).
7. Check gear end clearance; clearance should be .001
-
.002 (Fig. 6A1-23).
NOTE: The pump gears and body are not serviced
separately. If pump gears or body are worn, replacement
of the entire oil pump is necessary.
Fig. 6A1-20 Checking Driven Gear-To-Housing Clearance
Fig. 6A1-2 1 Checking Drive Gear-To-Crescent Clearance
Fig. 6A1-22 Checking Driven Gear-To-Crescent Clearance
8. If oil seal is damaged (and the pump body is good)
pry seal from bore and clean bore surface.
a. Coat seal lips with light engine oil and apply an
approved sealing compound to outside diameter of seal.
b. Position seal, closed end outward, into bore and install
seal until it is flush with pump body, using Tool J 23624 (Fig.
6A1-24).
Installation
1. Clean gasket surface on cylinder block and front
portion of oil pan. Install new oil pump to cylinder block
gasket and cut front portion of oil pan gasket and apply RTV
sealing compound (or equivalent) to cut off portion of oil pan
gasket. Lubricate pump gears and oil seal with engine oil.
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