8-4
Chapter 8 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
Damper - Inspect
Damper - Check Visually
Check the vibration damper for oil leakage, scratches,
deformation, discoloration and peeling of paint. Check
carefully for swelling on the cover (use a scale), oil
leaks from the shim, discoloration and peeling of paint
due to heat.
Note: If defects are found in the damper, contact a
dealer of Mitsubishi Heavy Industries, Ltd.
Fig. 8-2 Damper - Check Visually
Damper Temperature Management
For making damper function well, heat of damper must be dissipated from its surface to prevent excessive damper
heating. Mitsubishi inspects each engine before shipment to ensure proper operating temperature of the vibration
damper. However, the vibration damper temperature varies depending on ambient conditions. Therefore, observe
the following suggestions and provide sufficient ventilation for the vibration damper and equipment.
1.
Make sure the temperature of the outside damper surface does not exceed the temperature that described in the
following table when operating the engine with rated power for an hour.
2.
When installing a safety cover to damper, check ventilation carefully and make sure the damper temperature re-
mains below the temperature specified above, with the cover in place.
3.
It is recommended to use the thermo label for the temperature management of damper in regular use engine.
When installing a damper protective cover to the
engine, do not use a cover that encloses the damper.
It may cause serious engine problems because the
damper deteriorates by heat or not deliver enough its
performance.
Cover
Silicon
oil
Table 8-2 Damper Temperature Management
Type of damper
Continuous
Standby
Viscous damper
90°C [194°F]
100°C [212°F]
Viscous rubber damper
80°C [176°F]
90°C [194°F]
