Cadillac 60 Series 1963 Shop Manual page 218

ENGINE MECHANICAL
9-25
Piston
Rings
Piston Pin
Connecting
Rod
Fig. 9-26 Piston Cross Section
If clearance is greater than .0035 inch, replace
bearing. If new bearings do not reduce clearance
to less than .0035 inch, crankshaft must be r e -
placed to obtain specified limits. If both new
bearings and new crankshaft are installed, clear-
ance should be .0005 inch to .0021 inch.
22. Piston Ring Replacement
Each piston has two compression rings and a
side-seal type oil ring, Fig. 9-26, that incorpo-
rates a spring steel expander and two chrome
plated steel rails. The top compression ring is
chrome plated cast iron. The second compres-
sion ring is phosphate coated cast iron.
When replacing piston rings, install only r e -
ring sets that have chrome top compression rings,
and multi-piece oil rings.
The chamfered inner corner of each compres-
sion ring should be installed toward the top of
the piston.
1. Place ring in area of cylinder where piston
ring will travel. Be sure ring is square with
cylinder bore by positioning ring with piston head.
2. Gap between compression ring ends should
be .013 inch to .032 inch.
3. Gap between oil ring ends should be .015
inch to .061 inch.
4. With compression ring on piston, clearance
between top surface of piston ring and ring land
should be no greater than .005 inch. If clearance
is greater, replace the ring. If the new ring does
not reduce the clearance to .005 inch or less, new
pistons should also be installed.
be .0022 inch to .0035 inch. This can be checked
with a .002 inch and a .004 inch feeler gage on a
"go-no go" basis. The .002 inch feeler gage
should always enter; the .004 inch feeler gage
should never enter. When installing rings on
piston, gaps in piston rings should be staggered.
23. Piston Pin
Removal and Installation
a. Removal
1. Place Piston Pin Support, J-8390-5, on arbor
press.
2. Position piston and connecting rod assembly
on support with side of piston marked "REAR"
upward, Fig. 9-27.
3. Insert pilot end of Piston Pin Remover and
Installer, J-8390-6, into piston pin and press pin
out of piston and rod assembly.
4. Remove assembly from press and remove
piston from support.
NOTE: Keep piston pins in order so that
they may be installed in the piston from which
they were removed.
b. Installation
1. Lubricate piston pin and pin holes in piston
with engine oil to facilitate installation.
Remover and
Installer
J-8390-6
Piston Pin
Support J-8390-5
Clearance on new rings and new pistons should Fig. 9-27 Piston Pin Removal