Dodge ram truck 3500 1996 Service Manual page 1089

B R . .
S E R V I C E P R O C E D U R E S (Continued)
Fig. 13 Main Bearing Identification
CRANKSHAFT SERVICE
A crankshaft which has undersize journals will be
stamped with 1/4 inch letters on the milled flat on
the No.3 crankshaft counterweight (Fig. 14).
FOR EXAMPLE: R2 stamped on the No.3 crank­
shaft counterweight indicates that the No.2 rod jour­
nal is 0.025 mm (0.001 in) undersize. M4 indicates
that the No.4 main journal Is 0.025 mm (0.001 in)
undersize. R3 M2 indicates that the No.3 rod journal
and the No.2 main journal are 0.025 mm (0.001 in)
undersize.
Undersize Journal Identification Stamp
0.025 m m ( 0 . 0 0 1 inch) (Rod) R1-R2-R3 or R4
0.025 m m (0.001 inch) (Main) M 1 - M 2 - M 3 - M 4 or M 5
Fig. 14 Location of Crankshaft Identification
When a crankshaft is replaced, all main and con­
necting rod bearings should be replaced with new
bearings. Therefore, selective fitting of the bearings
is not required when a crankshaft and bearings are
replaced.
INSPECTION OF JOURNALS
The crankshaft connecting rod and main journals
should be checked for excessive wear, taper and scor-
5.9L ENGINE 9 - 99
ing. The maximum taper or out-of-round on any
crankshaft journal is 0.025 mm (0.001 inch).
Journal grinding should not exceed 0.305 mm
(0.012 inch) under the standard journal diameter. DO
NOT grind thrust faces of No.3 main bearing. DO
NOT nick crank pin or bearing fillets. After grinding,
remove rough edges from crankshaft oil holes and
clean out all oil passages.
CAUTION: After any journal grind, it is important
that the final paper or cloth polish be in the same
direction as the engine rotates.
R E M O V A L A N D I N S T A L L A T I O N
ENGINE FiONT MOUNTS
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Position fan to assure clearance for radiator top
tank and hose.
CAUTION: DO NOT lift the engine by the intake
manifold.
(3) Install engine support/lifting fixture.
(4) Raise vehicle on hoist.
(5) Lift the engine SLIGHTLY and remove the
thru-bolt and nut (Fig. 15).
(6) Remove engine support bracket/cushion bolts
(Fig. 15). Remove the support bracket/cushion and
heat shields.
RESTRICTION PADS
J9409-144
Fig. 15 Engine Front Mounts
INSTALLATION
(1) With engine raised SLIGHTLY, position the
engine support bracket/cushion and heat shields to
the block. Install new bolts and tighten to 81 N-m (60
ft. lbs.) torque.