Cummins/Onan — Vibration Damper Inspection
Maintenance · Vibration damper and pulley
From a Cummins/Onan service manual — check it applies to your exact model before use.
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Before you start
- Use gloves to protect hands from burns.
Procedure
- Separate damper from pulley.
- Steam clean both components and dry.
- Remove paint with fine emery cloth from front and rear surfaces.
- Measure and record damper thickness at four spaced areas.
- Replace damper if variation exceeds 0.010 in.
- Spray damper with Spotcheck Developer and heat in oven at 200°F for 15 minutes.
- Inspect for oil smudges or fluid leakage.
- Check pulley grooves for chips, cracks, and wear with new belt.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.