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6A3-12
1977 PONTIAC SERVICE MANUAL
OIL PUMP COVER
481 1
Fig. 6A3-22 Oil Pump Cover and Pressure-Relief Valve
7. Check filter
by- ass
valve for cracks. nicks. or
warping. The valve shoild be flat and free of nicks or
scratches.
Installation
1. Lubricate and install pressure relief valve and spring
in bore of oil pump cover. See Fig. 6A3- 22. Install cap and
gasket. Torque cap to specification with a reliable torque
wrench. Do not over-tighten.
2. Install oil pump gears and shaft in oil pump body
section of timing chain cover to check gear end clearance and
side clearance.
a. Check oil pump end clearance by placing a straight
edge over the gears and measure the clearance between the
straight edge and the gasket surface. See Fig. 6A3-23.
Clearance should be between .002" and ,006". (If clearance
is less than ,002" measure gears and pocket to determine
which is out of specification. See Figs 6A3-25 and 6A3-26).
b. Check oil pump side clearance as shown in Fig. 6A3-
24. Clearance should be between ,0025
-
.0050. (If clearance
is greater than .0050 measure gears and pocket to determine
which is out of specification). See Figs 6A3-25 and 6A3-26.
c. Check oil pump cover flatness by placing a straight
edge across the cover face, using a feeler gage between
straight edge and pump cover. If clearance is .001" or more
the pump cover must be replaced.
3. If gea; end clearance and oil pump cover is flat and
side clearance is satisfactory, remove gears and pack gear
pocket full of petroleum jelly. Do not use chassis lube.
4. Reinstall gears so petroleum jelly is forced into every
cavity of the gear pocket and between the teeth of the gears.
Place new gasket in position. This step is very important.
Unless the pump is packed with petroleum jelly it may not
prime itself when the engine is started.
5. Install cover assembly screws. Tighten alternately and
evenly to torque specifications.
6. Install filter on nipple.
CONNECTING ROD BEARINGS
A connecting rod bearing consists of two halves or shells
which are interchangeable in rod and cap. When the shells
are placed in position, the ends extend slightly beyond the
parting surfaces so that when the rod bolts are tightened the
shells will be clamped tightly in place to insure positive
seating and to prevent turning. The ends of the bearing
shells must never be filed flush with parting
Fig. 6A3-23 Checking Oil Pump End Clearance
Fig. 6A3-24 Measuring Oil Pump Side Clearance
I
Fig. 6A3-25 Measuring Gears For Wear
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