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ENGlN ES-8-CY UNDER
9-45
(2) Hold the piston and draw the feeler stock
straight out, with the spring scale Tool C-690 as
shown in Figure 104. The amount of pull required
should be from 5 to 10 pounds.
361, 383
8
426 Cubic Inch Engines
Fitting
Pistons
The piston and cylinder wall must be clean and
dry. The specified clearance between the piston at the
top of the skirt and the cylinder wall is .0005 to .0015
inch.
The piston diameter should be measured at the top
of the skirt
90"
to the piston pin axis. The cylinder
bores on used engines should be measured halfway
down the cylinder bore and
90"
to the engine crank-
shaft center line.
Pistons and cylinder bores should
be
measured at normal room temperature
7OOF.
All service pistons include the pin, and are avail-
able in standard and the following oversizes: .005,
.020, and .040 inch.
Piston
Rings
(1) Measure the piston ring gap about 2 inches
from the bottom of the cylinder bore in which it is to
be used. (An inverted piston can be used to push the
rings down into position. This will insure the rings
being exactly square with the cylinder wall before
measuring.)
(2) Insert the feeler stock in the gap. For 273 and
318 Cubic Inch Engine, the ring gap should be from
.010 inch to .047 inch for the compression rings and
.015 inch to .062 inch for the oil ring steel rails in
standard size bores (for new service rings). For 361,
383 and 426 Cubic Inch Engines, the ring gap should
be between .013 to .052 inch for the compression
rings and .015 to .062 inch for the oil ring steel rails
in standard size bores (for new service rings). All en-
gines, maximum gap in .005 inch O/S bores should
be .060 inch for compression rings and .070 inch for
PISTON R I N G - - - - - - - -
FEELER GAGE
RING GROOVE
\
oil ring steel rails.
(3) Measure the side clearance between piston ring
and ring land. The clearance should be .0015 to .003
inch for the top compression ring and the intermedi-
ate ring, and .001 to
.009
for the oil control ring. (For
new service rings.) (Fig. 105.)
(4) Install the oil ring in the lower ring groove us-
ing the instructions in the service ring package.
(5) Install the compression rings in the middle and
top grooves with side marked "TOP" up; use ring in-
staller Tool C-263 for the 273 Cubic Inch Engine,
Tool (2-3586 for the 318 Cubic Inch Engine, Tool
C-
3673 for the 383 and 426 Cubic Inch Engines, Tool
C-3628 for the 361 Cubic Inch Engine.
PISTON PIN
(273 and 318 Cubic Inch Engine)
Removal
sary for proper location.
ton pins.
Fitting Piston Pins
(1) The piston pin fit in the connecting rod and pis-
ton should be a tight thumb push fit at normal room
temperature, 70 degrees F.
(2) If there is excessive clearance between the pis-
ton pin and piston, ream piston and connecting rod
to next oversize. Piston pins are available in standard,
.003, .008 inch oversize.
(3) If there is excessive clearance between the pis-
ton pin and connecting rod, replace the connecting
rod bushing and fit the bushing to the piston pin.
(4) New pistons are supplied with fitted pins.
Instullution
(1) Assemble pistons and rods for the left hand
cylinder bank (1-3-5-7) with piston boss marked
"Front" and indent on piston head on the same side
(1) Mark all pistons and connecting rods as neces-
(2) Remove piston pin lock rings and press out pis-
ANVIL
(TOOL)
SCREW (TOOL)
ONNECTING ROD
KR195
B
GUIDE-LARGE (TOO
KR165
A
Fig. 705-Measuring
Piston Ring Clearance
Fig. 7
O&Tool
Arrangement for Removing
Piston Pin
Tool C-3684
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