Dodge ram truck 3500 1996 Service Manual page 1165

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S E R V I C E P R O C E D U R E S ( C o n t i n u e d !
(9) Determine the grade of the piston being used
by referring to the Piston Protrusion Chart (Fig. 26).
Four digits on top of the piston can be cross refer­
enced to a Chrysler part number for replacement
(Fig. 27). I f the number on the piston cannot be seen,
measure from the top of the piston to the top of the
piston pin to see what grade piston is used (Fig. 28).
MEASURING
PISTON
PROTRUSSON
U S E
GRADE
2571 0.609-0.711 mm (0.024-0.028 in.)
A
2571
0.508-0.609 mm (0.020-0.024
in.)
B
2571 0.406-0.508 mm (0.016-0.020 in.) C
2572 0.711-0.813 mm (0.028-0.032 in.)
A
2572 0 . 6 0 9 - 0 . 7 1 1 mm (0.024-0.028
in.)
B
2572
0.508-0.609 mm (0.020-0.024
in.) C
2573 0.813-0.914 mm (0.032-0.036 in.)
A
2573
0.711-0.813 mm (0.028-0.032
in.)
B
2573
0.609-0.711 mm (0.024-0.028
i n ) C
J9509-3
Fig. 26 Piston Protrusion Chart
J9509-2
5.9L (DIESEL) ENGINE 9 - 175
Dimension A
Rel.
N u m b e r
G r a d e
51.554 to 51.607mm
(2.029 to 2.031 in)
2571
A
51.654 to 51.707mm
(2.033 to 2.035in)
2572 3
51.754 to 51.807mm
(2.037 to 2.039in)
2573 C
J9509-1
Fig. 28 Piston Grading Measurement
CRANKSHAFT REWORK
Crankshaft main and rod journals may be ground
in increments of 0.25 mm (0.0098 inch) up to a total
of 1.00 mm (0.0394 inch).
The only exception is the main journal thrust
width surface. This journal must be ground in incre­
ments of 0.50 mm (0.0197 inch) up to a total of 1.00
mm (0.0394 inch). The thrust surface is located on
the No.6 main bearing. When the thrust surface
requires grinding, the main journal must be ground
to the same undersize dimension.
CAUTION: Welding of the crankshaft is not
allowed. Failure of the crankshaft will result.
MAIM JOURNAL
All main journals are to be ground in the opposite
direction of engine rotation (clockwise as viewed from
the front of crankshaft). Polish the journals in the
same direction as engine rotation.
The main bearing grinding specifications are
shown in (Fig. 29).
Fig. 27 Piston Grading Number Location