Crankshaft, Main Bearings, and Flywheel
02
040
2
RG,RG34710,149 –19–23OCT00–1/1
Inspect Crankshaft Vibration Damper
RG8536 –UN–20MAY98
Checking Damper Rotation
RG8537 –UN–10DEC97
Measuring Damper Radial Runout
A—Probe
Refer to your machine operator’s manual for
recommended vibration damper inspection frequency.
1. Remove V-belt (shown removed).
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 remanufactured basic engine
is installed.
2. Carefully inspect vibration damper for torn or split
rubber protruding from front and back of assembly.
3. Grasp vibration damper with both hands and attempt to
turn it in both directions. If rotation is felt, damper is
defective and should be replaced.
4. Check vibration damper radial runout by positioning a
dial indicator so probe (A) contacts damper OD.
5. With engine at operating temperature, rotate crankshaft
using JDG820 Flywheel Turning Tool.
6. Note dial indicator reading. Replace vibration damper if
radial runout exceeds specifications.
Specification
Vibration Damper—Maximum
Radial Runout 0.76 mm (0.030 in.).............................................................
CTM100 (06APR04)
02-040-2
P
OWER
T
ECH
10.5 L & 12.5 L Diesel Engines
040604
PN=198
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