Perkins 1106C Genset Systems Operation Testing And Adjusting page 76

76
Testing and Adjusting Section
Illustration 77
Vibration damper with out hub assembly
Replace the vibration damper if any of the following
conditions exist:
•
There is any impact damage to the outer casing.
•
There is leakage of the viscous fluid from the cover
plate.
•
There is movement of the pulley or the outer ring
on the hub.
•
There is a large amount of gear train wear that is
not caused by lack of oil.
•
Analysis of the engine oil has revealed that the
front main bearing is badly worn.
•
The engine has had a failure because of a broken
crankshaft.
Check the areas around the holes for the bolts in
the vibration damper for cracks or for wear and for
damage.
Use the following steps in order to check the
alignment and the runout of the vibration damper:
1. Remove any debris from the front face of the
vibration damper. Remove any debris from the
circumference of the vibration damper.
2. Mount the dial indicator on the front cover. Use
the dial indicator to measure the outer face of the
vibration damper. Set the dial indicator to read
0.00 mm (0.00 inch).
3. Rotate the crankshaft at intervals of 45 degrees
and read the dial indicator.
4. The difference between the lower measurements
and the higher measurements that are read on the
dial indicator at all four points must not be more
than 0.18 mm (0.007 inch).
If the reading on the dial indicator is more than
0.18 mm (0.007 inch), inspect the pulley and the
vibration damper for damage. If the pulley or the
vibration damper are damaged, use new parts for
replacement.
5. Move the dial indicator so that the dial indicator
will measure the circumference of the vibration
damper. Set the dial indicator to read 0.00 mm
(0.00 inch).
6. Slowly rotate the crankshaft in order to measure
the runout of the circumference of the vibration
damper. Use the highest reading and the lowest
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reading on the dial indicator. The maximum and
the minimum readings on the dial indicator should
not vary more than 0.12 mm (0.005 inch).
If the reading on the dial indicator is more than
0.12 mm (0.005 inch), inspect the pulley and the
vibration damper for damage. If the pulley or the
vibration damper are damaged, use new parts for
replacement.
KENR6931