Cadillac 60 Series 1963 Shop Manual page 219

9-26
ENGINE MECHANICAL
Arbor Press
Remover and
Installer
J-8390-6
Piston Pin
Spacer J-8390-2
Spring J-8390-4
Piston Pin
Support J-8390-5
Fig. 9-28 Piston Pin Installation
2. Place Piston Pin Support, J-8390-5, on arbor
press with Spring, J-8390-4, and Spacer, J-8390-2,
in position in Support, as shown in Fig. 9-28.
3. Position connecting rod in its respective
piston so that, when assembly is installed in
engine, side of piston stamped "REAR" is toward
rear of the engine and number on lower end of
rod is down. (Numbers 1, 3, 5, and 7 are in the
left bank, and 2, 4, 6, and 8 are in the right bank.)
4. Position piston with connecting rod on Piston
Pin Support, and insert piston pin into position as
shown in Fig. 9-28.
5. Place Piston Pin Remover and Installer,
J-8390-6, on piston pin and press pin in until it
bottoms on spacer in support. This will properly
locate the piston in the connecting rod.
NOTE: Piston pins are a selective fit to
the piston and are not available separately.
Piston pins will not wear enough to cause a
knock or tapping until after very high mileage,
and in such cases, a new piston and pin assem-
bly should be installed.
24. Piston Clearance
Pistons should be measured for size 3/16
inch below the upper cross slot and 1/4 inch to
either side of the vertical slot, Fig. 9-29. Cylin-
ders should be measured 1-1/8 inches from the
top, crosswise to the cylinder block.
The clearance should be .0003 inch to .0007
inch in this position at 70°F. Subtract .0001 inch
from measurement for every 6° above 70°F.
An identification letter is stamped on the valve
lifter compartment cover rail next to the lower
inside edge of the cylinder head. The letters
are in groups of two for adjacent cylinders (such
as " A " " B " ) midway between the two cylinders.
This letter denotes the cylinder size as shown
in the following table:
jtter
A
B
C
D
E
H
J
K
L
M
Cylinder Size
(Diameter
in inches)
4.0000-4.0002
4.0002-4,0004
4.0004-4.0006
4.0006-4.0008
4.0008-4.0010
4.0010-4.0012
4.0012-4.0014
4.0014-4.0016
4.0016-4.0018
4.0018-4.0020
Piston Size
(Diameter
in inches)
3.9995-3.9997
3.9997-3.9999
3.9999-4.0001
4.0001-4.0003
4.0003-4.0005
4.0005-4.0007
4.0007-4.0009
4.0009-4.0011
4.0011-4.0013
4.0013-4.0015
The table indicates ten piston sizes to match
ten bore sizes, ranging in steps of .0002 inch from
4.0000 inches to 4.0020 inches. This makes it
possible to maintain the .0003 inch to .0007 inch
piston to cylinder block clearance.
If double letters (such as "AA" "BB") appear
on the valve lifter compartment cover rail of the
block, it indicates that the cylinder has been
bored to .010 inch over the diameter indicated
by the single letter in the chart. For example,
a cylinder with the letters " C C " stamped on the
block would have a diameter of 4.0104 inches to
4.0106 inches, and a piston diameter of 4.0099
inches to 4.0101 inches.
A single piston, 4.0200 inches to 4.0210 inches,
is manufactured for the entire range of .020 inch
oversize cylinder bores. The same is true for
.030 inch oversize bore range 4.0300 inches to
4.0310 inches.
Measure
and 1/4"
Piston 3/16" Below Cross
to Either Side of Vertical
Slot
Slot
* " f
: ' , £ •
Fig. 9-29 Measuring Piston Diameter