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6A4-28
1977 PONTIAC SERVICE MANUAL
Fig.
6A4-75
Connecting Rod Guide Bolt
Fig.
6A4-76
Piston Ring Compressor
installation of remaining piston assemblies.
The clearance between the adjacent rods, when checked
with a feeler gauge on each crankpin, should be from . 0 6 "
to .020n. ( Fig. 6A4-77)
5. Torque rod bolt nuts to 42 ft. lbs.
PISTON PINS
The correct piston pin fit in the piston is .0003" to .0005"
loose. If the pin to piston clearance is to the high limit
(.0005"), the pin can be inserted in the piston with very little
hand pressure and will fall through the piston by its own
weight. If the clearance is .0003", the pin will not fall through.
It is important that the piston pin hole be clean and free of
oil when checking pin fit. The pin is a press fit in the
connecting rod.
Whenever the replacement of a piston pin is necessary,
use the following procedure.
I
SPREAD RODS
WITH
I
CHECK CLEARANCE
\\
Fig.
6 ~ 4 - 7 7
Connecting Rod Side Clearance
Removal (Fig. 6A4-78)
Only use the Front Rod Support, Guide Tube and Base
during the pin removal process. Remove Threaded Plug,
Spring and Piston Pin Guide assembly prior to using the tool.
Piston Pin should fall through center of Guide Tube after it
is pushed through connecting rod.
CAUTION: Always be sure Piston Pin is in
contact with inside tadius of Front Rod Support.
Piston Pin may bind on lower Guide Tube if
allowed to move too
far
forward. This provides
proper alignment for Piston Pin to enter lower
Guide Tube. (Fig. 6A4- 78)
Installation
1. Consult depth gauge chart for proper gauge to pre-set
distance from Front Rod Support to Piston Pin Guide.
2. Thread Stop Nut into bottom of Guide Tube.
3. Drop Guide Body and Piston Pin Guide into Guide
Tube without spring.
4.
Adjust Threaded Stop Nut until it touches tip of
gauge.
5. Install spring between Guide Body and Threaded Stop
Nut.
6. Select Piston Pin Guide which fits snug in Piston Pin
bore.
7. Slip Piston Pin Guide over Guide Body.
8. Place piston and connecting rod into place on Front
Rod Support. Piston Pin Guide should come up into Piston
Pin bore and be free to move.
9. Place Piston Pin into pin hole in Piston.
10. Place driver into end of Piston Pin.
11. Push driver until pin comes to stop.
NOTE: During Pin installation, Piston must have free
movement on Piston Pin.
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