Chrysler RAM TRUCK 2500 1994 Service Manual page 876

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5JL (DIESEL) ENGINE 9 - 155
Thrust journals can be ground i n the same incre­
ments and using the same specifications as all other
main journals. The main journal radius may be
ground using either the preferred or the alternative
procedure providing the thrust surface width is not
being ground. The preferred procedure must be used
when the main bearing thrust width surface is
ground. When the thrust surface width requires
grinding, the main journal must be ground to the
same undersize dimension (Fig. 6).
THRUST JOURNAL WIDTH
37.500 ±0.025 mm
(1.4764 ±0.001 inch)
UNDERSIZES
REGRIND WIDTH TO
0.50 mm 38.000 ±0.025 mm
(0.0197 inch) (1.4961 ±0.001 inch
1.00 mm
38.500 ±0.025 mm
(0.0394 inch)
(1.5158 ±0.001 inch)
J9109-127
Fig. 6 Crankshaft Thrust Journal Width Dimensions
The thrust surface is to be ground on center within
0.10 mm (0.004 inch). I t also must be perpendicular
to the front and rear mains within 0.0015 mm
(0.00006 inch) per radial inch on the thrust area
(Fig. 7). The surface finish requirement is 0.04 mi­
crometer (16.0 microinch).
JOURNAL
J9109-128
Fig. 7 Crankshaft Thrust Surface
PREFERRED PROCEDURE:
Smoothly blend a 4.20 ±0.020 mm (0.1654 ±0.0008
inch) radius to the ground diameters (Fig. 8).
CAUTION: DO NOT use the Alternative Procedure
when the thrust surface width is ground.
ALTERNATIVE PROCEDURE:
Smoothly blend a 1.25 ±0.020 mm (0.0492 ±0.0008
inch) radius to the ground diameters (Fig. 9).
ORIGINAL RADIUS
JOURNAL SURFACE
SURFACE FINISH
®
0.8 micrometer (32.0 microinch)
for a minimum of 45° into the
fillet beyond journal surface
1.6 micrometer (64.0 microinch)
©
for remainder of fillet
©
0.4 micrometer (16.0 microinch)
J9109-129
Fig. 8 Grind Crankshaft Main Journal—Preferred
Method
ROD JOURNAL
All rod journals are to be ground i n the opposite di­
rection of engine rotation (clockwise as viewed from
the front of crankshaft). Polish the journals i n the
same direction as engine rotation.
The rod bearing grinding specifications are shown
in Fig. 10.
PREFERRED PROCEDURE:
Smoothly blend a 4.00 ±0.020 (0.1575 ±0.0008
inch) radius to the ground diameters and side faces
(Fig. 11).
A L T E R N A T I V E PROCEDURE:
Smoothly blend a 1.25 ±0.020 mm (0.0492 ±0.0008
inch) radius to the ground journals (Fig. 12).
CRANKSHAFT FRONT SEAL
REMOVAL
(1) Remove the drive belt.
(2) Remove the vibration damper.
(3) Drill two l/8th inch holes into the seal face,
180° apart.
(4) Use a slide hammer tool with a #10 metal
screw. Pull alternating from side-to-side until the
seal is free.