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6 A 1-24
1977 PONTIAC SERVICE MANUAL
Fig. 6A1-65 Piston Alignment Reference
CONNECTING ROD BEARINGS
Connecting rod bearings are of the precision insert type
and do not use shims for adjustment. DO NOT FILE RODS
OR ROD CAPS. If clearances are found to be excessive, a
new bearing will be required. Bearings are available in
standard size and .00lW and .002" undersize for use with new
and used standard size crankshafts, and in .01OW and .02OW
undersize for use with reconditioned crankshafts.
Inspection and Replacement
1. Remove the connecting rod cap and bearing.
2. Inspect the bearing for evidence of wear or damage.
3. Wipe the bearings and crankpin clean of oil.
4. Measure the crankpin for out-of-round or taper with
a micrometer. If not within specifications, replace or
recondition the crankshaft. If within specifications and a new
Fig. 6A1-66 Installing Connecting Rod
Fig. 6A 1-67 Installing Piston Assembly
bearing is to be installed, measure the maximum diameter of
the crankpin to determine new bearing size required.
5. If within specifications, measure new or used bearing
clearances with gaging plastic.
NOTE: If a bearing is being fitted to an out-of-round
crankpin, be sure to fit to the maximum diameter of the
crankpin. If the bearing is fitted to the minimum
diameter and the crankpin is out-of-round .00lV,
interference between the bearing and crankpin will result
in rapid bearing failure.
a. Place a piece of gaging plastic the full width of the
crankpin, parallel to the crankshaft (Fig. 6A1-68).
b. Install the bearing in the connecting rod and cap.
c. Install the bearing cap and evenly torque nuts to 65
lbs. ft.
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