Operation
3140−1/A1
Winterthur Gas & Diesel Ltd.
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Axial Damper
1. General
The engine has a built-in axial damper. The function of the axial damper is to
decrease axial vibrations.
The axial damper includes a top cylinder half (1, Fig. 1) and a bottom cylinder half (2)
attached with bolts to the last bearing girder. The flange (13) is part of the
crankshaft (10).
2. Function
Bearing oil flows from the oil inlet (OI) through the orifice (8) into the spaces (OS) to
each side of flange (13). When the crankshaft turns, most of the bearing oil flows
through the housing (3) between the oil spaces (OS). The remaining oil drains
through the radial and axial clearances of the gaskets (5) and (6).
It is possible to adjust the effect of the axial damper with the spindle (4).
Note: Usually, the adjustment setting is done during engine assembly.
Adjustments can only be done during an axial vibration measurement.
The setting value of the spindle must be engraved on a nameplate near the
housing (3).
An opening in the top of the casing lets you get indications at different positions of the
spindle (4) during sea trials. Do not change the position of the spindle.
CAUTION
Damage Hazard: Do not operate the engine if there is no oil
supply to the axial damper, or the spindle (4) is removed.
3. Monitoring System
The engine has a system, installed at the free end above the casing, that monitors the
axial damper. This system monitors the oil pressure in the oil spaces (OS) of the axial
damper. If the oil pressure decreases below a set value, an alarm is activated (for
more data about the setting values, see 0250−2 Alarms and Safeguards).
The reason for this alarm must be found and repaired:
D Orifices in the pressure gauge pipes clogged
D Shut-off valves closed in the pressure gage pipes
D Low oil pressure and / or high oil temperature in the bearing oil system
D Spindle not adjusted correctly
D Too much wear of the sealing rings, e.g. dirt particles (clearance too large).
2014
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