Dodge ram truck 3500 1996 Service Manual page 1168

9 - 178 5.9L (DIESEL) ENGINE
S E R V I C E P R O C E D U R E S (Continued)
ALTERNATIVE PROCEDURE:
Smoothly blend a 1.25 ±0.020 mm (0.0492 ±0.0008
inch) radius to the ground journals (Fig. 36).
ORIGINAL RADIUS
SURFACE FINISH
® 0.8 micrometer (32.0 microinch)
for a minimum of 45° into the
^ fillet beyond journal surface
v§/ 1.6 micrometer (64.0 microinch)
^ for remainder of fillet
v£/ 0.4 micrometer (16.0 microinch)
WIDTH OF REGRIND/UNDERCUT RADIUS
© 34.79 ±0.025 m m (1.369 ±0.001 in)
J9109-132
Fig, 36 Grind Crankshaft Rod Journai—Alternative
Method
MAIN BEARING CLEARANCE
Inspect the main bearing bores for damage or
abnormal wear.
Install the crankshaft main bearings and measure
main bearing bore diameter with the main bolts
tightened to 176 N-m (130 ft. lbs.) torque (Fig. 37).
Measure the diameter of the main journal at the
locations shown (Fig. 38). Calculate the average
diameter for each side of the journal.
Calculate the main bearing journal to bearing
clearance, the clearance specifications are 0.119 mm
(0.00475 inch). I f the crankshaft journal is within
limits, replace the main bearings. I f not within spec­
ifications, grind the crankshaft to next size and use
oversize bearings.
REMOVAL A N D I N S T A L L A T I O N
ENGINE FRONT MOUNTS
REMOVAL
(1) Disconnect the negative cable from the battery.
mm
M A X . 8 3 . 1 0 6 mm ( 3 . 2 7 1 9 i n c h )
J 9 1 0 9 - 9 2
Fig. 37 Crankshaft Main Bearing Bore Diameter
M I N . 8 2 . 9 6 2 mm ( 3 . 2 6 6 2 i n c h )
M A X . 8 3 . 1 0 3 m m ( 3 . 2 6 8 2 i n c h )
J 9 1 0 9 - 9 3
Fig. 38 Crankshaft Main Journal Diameter
(2) Position fan to assure clearance for radiator top
tank and hose.
(3) Install engine support/lifting fixture.
(4) Raise vehicle on hoist.
(5) Lift the engine SLIGHTLY and remove the
thru-bolt and nut (Fig. 39).
(6) Remove engine support bracket/cushion bolts
(Fig. 39). Remove the support bracket/cushion.
mswMLLAwmm
(1) With engine raised SLIGHTLY, position the
engine support bracket/cushion to the block. Install
new bolts and tighten to 189 N-m (140 ft. lbs.)
torque.
(2) Install the thru-bolt into the engine support
bracket/cushion.