Dodge RAM TRUCK 1500 1995 Service Manual page 1017

I -118 5 J L (DIESEL) ENGINE
BR
Inspect the front and rear seal contact areas of the
crankshaft for scratches or grooving.
The service seal kit will position the seal slightly
deeper into the seal bore so it will contact the crank­
shaft at a different location. If this has already been
done and the crankshaft has two worn areas, install
a wear sleeve to provide a new contact surface for
the seal.
Inspect the rod and main journal for deep scores,
signs of overheating and other abnormal marks.
C l l A M E w L i f l ^ h
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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 re­
quires 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
MAIN
J0URIAL
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. 5.
STANDARD MAIN JOURNAL DIAMETER
83.000 ±0.013 mm
(3.2677 ±0.0005 Inch)
W O R N M A I N J O U R N A L DIAMETER LIMIT
82.962 (3.2662 inch)
UNDERSIZES
R E G R I N D TO
0.25 mm
(0.0098 inch)
82.750 +0.013 mm
(3.2579 ±0.0005 inch)
0.50 mm
(0.0197 inch)
82.500 ±0.013 mm
(3.2480 ±0.0005 inch)
0.75 mm
(0.0295 inch)
82.250 ±0.013 mm
(3.2381 ±0.0005 inch)
1.00 mm
(0.0394 inch)
82.000 ±0.013 mm
(3.2283 ±0.0005 inch)
OUT-OF R O U N D & TAPER (MAX.)
0.005 mm (0.0002 inch)
ALL M A I N J O U R N A L S A R E TO BE PARALLEL
TO THE FRONT A N D REAR M A I N S W I T H I N :
0.030 mm 0.001 inch)
J9109-125
Fig. 5 Crankshaft Main Journal Dimensions
Thrust journals can be ground in 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 J O U R N A L WIDTH
37.500 ±0.025 mm
(1.4764 ±0,001 inch)
U N D E R S I Z E S 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). It 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).