Dodge RAM 1500 1998 Owner's Manual page 1497

9 - 274 ENGINE 5.9L DIESEL
CRANKSHAFT MAIN
BEARINGS
STANDARD PROCEDURE - MAIN BEARING
CLEARANCE
Inspect the main bearing bores for damage or
abnormal wear.
(1) Remove bearings and measure main bearing
bore diameter after torquing main bearing cap bolts
to 176 Nm (130 ft. lbs.).
(2) Install the crankshaft main bearings and mea-
sure main bearing bore diameter with the main bolts
tightened to 176 N·m (130 ft. lbs.) torque (Fig. 66).
(3) Measure the diameter of the main journal at
the locations shown (Fig. 67). Calculate the average
diameter for each side of the journal.
Fig. 66 Crankshaft Main Bearing Bore Diameter
1 - MAIN BEARING CAPS
MAIN BEARING BORE DIAMETER CHART
ITEM
BEARINGS INSTALLED
BEARINGS REMOVED
MAIN BEARING BORE
DIAMETER (MAXIMUM)
83.106 mm (3.2719 in.)
Min 87.983 mm (3.4639
in.)
Max. 88.019 mm (3.4653
in.)
Fig. 67 Crankshaft Main Journal Diameter
CRANKSHAFT MAIN JOURNAL DIAMETER
ITEM
Minimum diameter
Maximum diameter
Maximum out of
roundness
Maximum taper
Thrust distance (at No.6
position)
(4) Calculate the main bearing journal to bearing
clearance. Maximum clearance is 0.119 mm (0.00475
inch). If the crankshaft journal is within limits,
replace the main bearings. If not within specifica-
tions, grind the crankshaft to next size and use over-
size bearings.
(5) Measure thrust distance at the No.6 position.
CHART
SPECIFICATION
82.962 mm (3.2662 in.)
83.013 mm (3.2682 in.)
0.050 mm (.002 in.)
0.013 mm (.0005 in.)
Min. 0.065 mm (.003 in.)
Max. 0.432 mm (.017 in.)
DR