Checking Crankshaft Vibration Damper (If Equipped)

Special Tools:
• JDE83 Flywheel Turning Tool
or
•JDE81-1 Flywheel Turning Tool

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

   IMPORTANT: Prevent engine vibration and possible damage. Crankshaft vibration damper is not repairable. Elastomeric crankshaft vibration damper must be replaced every 4500 hours or 60 months, whichever comes first.
   For engines equipped with viscous crankshaft vibration damper, replace at major engine overhaul.

   Thoroughly clean and inspect vibration damper. When elastomeric material has separated, is partially missing, or has any visible inconsistency, replace the crankshaft vibration damper.

2. Remove belts see Replacing Fan and Alternator Belts in Section 40.

3. 
   RG19046-UN-23AUG10

   Crankshaft Vibration Damper Check

   Grasp the outer ring of the crankshaft vibration damper and attempt to turn it in both directions. If rotation is felt, the crankshaft vibration damper is worn or damaged and must be replaced.

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4. 
   RG18936-UN-10AUG10

   Radial Runout (Concentricity) Check

   Check the crankshaft vibration damper radial runout (concentricity) by positioning a magnetic base dial indicator with the probe contacting the outer diameter of the crankshaft vibration damper outer ring, as shown.

   1. With engine at operating temperature, rotate crankshaft using JDE83 or JDE81-1 flywheel turning tool. Record dial indicator readings.

   2. Compare readings with specification. If the runout (concentricity) exceeds specification, replace crankshaft vibration damper.

   Item	Measurement	Specification
   Crankshaft Vibration Damper Outer Ring	Radial Runout (maximum)	1.5 mm (0.060 in)

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5. 
   RG9053-UN-16MAR98

   Axial Runout (End Play) Check

   A - Crankshaft Vibration Damper Outer Ring Axial Runout (end play)

   Check the crankshaft vibration damper axial runout (end play) by positioning a magnetic base dial indicator with the probe contacting the front surface of the crankshaft vibration damper outer ring.

   1. With the engine at operating temperature, rotate crankshaft using JDE83 or JDE81-1 flywheel turning. Record dial indicator readings.

   2. Compare readings with specification. If the axial runout exceeds specification, replace crankshaft vibration damper.

   Item	Measurement	Specification
   Crankshaft Vibration Damper Outer Ring	Axial Runout (maximum)	0.76 mm (0.030 in)

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6. Replace belts see Replacing Fan and Alternator Belts in Section 40.