Use soapy water to clean any oil from the vibration damper/crankshaft speed indicator ring assembly.
Dry the vibration damper/crankshaft speed indicator ring assembly with compressed air.
Inspect the crankshaft speed indicator ring for missing teeth, cracks, or damaged surfaces. If any damage is
found, the entire vibration damper/crankshaft speed indicator ring assembly must be replaced.
Check the mounting web for cracks.
Check the housing for dents or raised surfaces.
Replace the damper if any of these defects are identified.
NOTE: The viscous damper is filled with a silicone fluid.
After many hours of use, the silicone fluid can become thicker and expand.
To determine if the damper thickness is correct, remove the paint from the damper in four locations on either side
of the damper.
Measure and record the thickness of the damper in four places. Measure the thickness at 80.65 mm [3.175 in] from
the outside of the damper.
Replace the damper if its thickness varies by more than 6.35 mm [0.25 in].
Spray the damper with spot check developer, type SKD-NF, or its equivalent.
Heat the damper in an oven, rolled-lip side down, at 93ยฐC (200ยฐF] for 2 hours .
Remove the damper from the oven and check for fluid leakage.
If there is any leakage, the vibration damper must be replaced.
