Crankshaft, Main Bearings, and Flywheel
02
040
39
RG,RG34710,180 –19–13AUG99–1/4
Install Crankshaft Vibration Damper and
Front Oil Seal
RG8422 –UN–09DEC97
JDG974-2 Forcing Screw Installed on Damper
RG8423 –UN–09DEC97
Front Seal Positioned on Damper
A—Front Crankshaft Oil Seal
B—JDG974-2 Seal Installer Forcing Screw
C—JDG974-3 Guide Plate
IMPORTANT: The vibration damper assembly is not
repairable and should be replaced every
5 years or 4500 hours, whichever
occurs first.
ALWAYS replace vibration damper
whenever crankshaft is replaced and at
major engine overhaul. Also replace
damper when a short block, complete
block, or reman basic engine is
installed.
Front crankshaft oil seal (A) must be installed onto
vibration damper before installing damper onto engine.
Install Front Seal onto Vibration Damper
1. Apply LOCTITE

680 (TY15969) Retaining Compound
around OD of crankshaft flange. Position front oil seal
assembly on flange with rubber seal ring facing up as
shown.
NOTE: Lubricate threads of forcing screw with
multi-purpose grease.
2. Lay vibration damper on table (front face down) with
JDG974-2 Seal Installer Forcing Screw (B) extending
through damper ID.
3. Hold forcing screw against front face of damper and
position JDG974-3 Guide Plate (C) in ID of damper as
shown.
LOCTITE is a registered trademark of Loctite Corp.
Continued on next page
CTM100 (06APR04)
02-040-39
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=235
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General