INSPECT VIBRATION DAMPER (6-CYLINDER
IMPORTANT: Do not immerse the vibration damper in
cleaning solvent or any petroleum
product. Rubber portion of damper may
Never apply thrust on outer ring.
Damper is sensitive to impact damage,
such as being dropped or struck with a
The damper assembly is not repairable.
Replace damper every 5 years or 4500
hours, whichever occurs first. Also,
replace damper whenever crankshaft is
replaced or after major engine overhaul.
1. Grasp outer ring of damper and attempt to turn it in
both directions. If rotation is felt, damper is defective
and should be replaced. Also, if rubber is separated,
partially missing, or displaced, replace damper.
2. Check vibration damper radial runout by positioning a
dial indicator so probe contacts damper OD.
3. With engine at operating temperature, rotate crankshaft
using JDG820 or JDE83 Flywheel Turning Tool.
4. Note dial indicator reading. If runout exceeds
specifications given below, replace vibration damper.
Maximum Radial Runout ............................................ 1.50 mm (0.060 in.)
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