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6A4-22
1977 PONTIAC SERVICE MANUAL
3. Install the oil pan. Refer to OIL PAN Installation.
Fig. 6A4-58
Connecting Rod Bolt Guide
Fig. 6A4-57
Oil
Pump
Installation
CONNECTING ROD AND PISTON
ASSEMBLY
Removal
1. Remove intake manifold, head or heads.
2. Remove oil pan.
3. Remove oil pump assembly.
NOTE: Stamp cylinder number on the machined
surfaces of the bolt bosses of the connecting rod and cap
for identification when reinstalling. If the pistons are to
be removed from the connecting rod, mark cylinder
number on piston with a silver pencil or quick drying
paint for proper cylinder identification and cap to rod
location. The right bank is numbered 2-4-6-8, left bank
1-3-5-7.
Examine the cylinder bore above ring travel. If ridge
exists, remove ridge with ridge reamer before attempting to
remove the piston and rod assembly.
4. Remove rod bearing cap and bearing.
5. Install guide hose over threads of rod bolts. This is
to prevent damage to bearing journal and rod bolt threads.
(Fig. 6A4-58)
6. Remove rod and piston assembly through the top of
the cylinder bore.
7. Remove other rod and piston assemblies in the same
manner.
ROD BEARINGS
The connecting rod bearings are designed to have a slight
projection above the rod and cap faces to insure a positive
contact.
Connecting rod bearings can be replaced without
removing the rod and piston assembly from the engine.
1. Remove oil pan.
NOTE: It may be necessary to remove oil pump to
provide access to rear connecting rod bearings.
2. With connecting rod journal at the bottom, stamp
cylinder number on machined surfaces of connecting rod and
cap for identification when reinstalling, then remove caps.
3. Inspect journals for roughness and wear. Slight
roughness may be removed with a fine grit polishing cloth
saturated with engine oil. Burrs may be removed with a fine
oil stone by moving the stone on the journal circumference.
Do not move the stone back and forth across the journal. If
the journals are scored or ridged, the crankshaft must be
replaced.
4. The connecting rod journals should be checked for
out-of-round and correct size with a micrometer. Maximum
out-of-round must not exceed .0015".
NOTE: Refer to ENGINE SPECIFICATIONS Chart
at the back of this section.
NOTE: Crankshaft rod journals will normally be
standard size, if any undersized crankshafts are used, all
will be
.010"
U.S. and an "X" will be stamped on the
pad at the L.F. upper comer of the block.
If plastic gauging material is to be used:
5. Clean oil from journal bearing cap, connecting rod
and outer and inner surface of bearing inserts. Position insert
so that tang is properly aligned with notch in rod and cap.
(Fig. 6A4-59)
6. Place a piece of plastic gauging material in the center
of lower bearing shell.
7. Reinstall bearing cap and torque to 42 ft. lbs.
8. Remove bearing cap and determine bearing clearances
by comparing the width of the flattened plastic gauging
material at its widest point with the graduation on the
container. The number within the graduation on the envelope
indicates the clearance in thousandths of an inch. If this
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