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6A 1-22
1977 PONTIAC SERVICE MANUAL
PISTON
.
PIN
.FIXTURE
&
SUPPORT
ASSEMBLY
Fig. 6A1-59 Tool and
Support
Assembly
PRESS
PISTON P I N
INSTALLER
J
240136 7
Fig. 6A1-60 Installing Piston Pin
Piston Rings
All compression rings are marked on the upper side of
the ring. When installing compression rings, make sure the
marked side is toward the top of the piston.
The top ring is chrome faced, or treated with
molybdenum for maximum life.
The oil control rings are of the three-piece type,
consisting of two segments (rails) and a spacer.
-
Fig. 6A1-61 Measuring Ring
Gap
1. Select rings comparable in size to the piston being
used.
2. Slip the compression ring in the cylinder bore; then
press the ring down into the cylinder bore about 1/4" (above
ring travel). Be sure ring is square with cylinder wall.
-
3. Measure the space or gap between the ends of the ring
with a feeler gage (Fig. 6A1-61).
4. If the gap between the ends of the ring is below
specifications, remove the ring and try another for fit.
5. Fit each compression ring to the cylinder in which it
is going to be used.
6. If the pistons have not been cleaned and inspected as
outlined, do so.
7. Slip the outer surface of the top and second
compression ring into the respective piston ring groove and
roll the ring entirely around the groove (Fig. 6A1-62) to make
sure that the ring is free. If binding occurs at any point, the
cause should be determined and, if caused by ring groove,
remove by dressing with a fine cut file. If the binding is caused
by a distorted ring, use a new ring.
8. Install piston rings as follows (Fig. 6A1-63).
a. Install oil ring spacer in groove.
b. Hold spacer ends butted and install lower steel oil ring
rail with gap properly located.
c. Install upper steel oil ring rail with gap properly
located.
d. Flex the oil ring assembly to make sure ring is free.
If binding occurs at any point, the cause should be determined
and, if caused by ring groove, remove by dressing groove with
a fine cut file. If binding is caused by a distorted ring, use a
new ring.
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