Checking Crankshaft Vibration Damper (6-Cylinder Engine Only)

RG8018-UN-15JAN99

Grasp Crankshaft Vibration Damper

RG7508-UN-23NOV97

Check Runout

1. IMPORTANT: Crankshaft vibration damper is not repairable. For engines equipped with elastomeric crankshaft vibration damper replace every 4500 hours or 60 months, whichever comes first. For engines equipped with viscous crankshaft vibration damper replace at major engine overhaul. Also replace viscous crankshaft vibration damper when short block, complete block, or remanufactured basic engine is installed.

   NOTE: Checking procedure only applies to elastomeric crankshaft vibration damper.

   Remove belts (shown removed).

2. Grasp crankshaft vibration damper with both hands and attempt to turn it in both directions. If rotation is felt, crankshaft vibration damper is defective and should be replaced.

3. Check crankshaft vibration damper radial runout by positioning a dial indicator so probe contacts crankshaft vibration damper outer diameter.

4. With engine at operating temperature, rotate crankshaft using either JDE83 or JDE81-1 flywheel turning tool.

5. Note dial indicator reading. If runout exceeds specification, replace crankshaft vibration damper.

   Item	Measurement	Specification
   Crankshaft Vibration Damper	Maximum Radial Runout	1.50 mm (0.060 in)