Maintenance
3103−1/A1
RT-flex58T-D
Winterthur Gas & Diesel Ltd.
3/ 3
4. Judging the measuring
STROKE
D
94305
C
nB.D.C
nT.D.C
The difference between the indicated values shows the amount of crank deflection
during one revolution (Fig. ’B’).
Where values are measured which lie above the maximum permissible limits, the
cause has to be found and the necessary remedial measures taken (defective
main bearing, engine stay altered due to hull deformation, loose holding-down
bolts, defective propeller shaft bearings or checking equipment 94305, etc.).
The limits are valid for any condition of ship service after ship delivery, i.e.:
− The ship’s draught and trim are within the limits for normal operation.
− The engine is stopped and hot or cold.
− In case of measurements at cold engine condition, any tank heating which is
arranged close or below the main engine as well as the pre-heater of the main
lubricating oil separator have to be out of operation at least 8 hours prior to the
measurement.
Normal ship service: Crankweb deflection limits [mm]
Vertical Horizontal
Cylinder No. 1
(Driving end)
Cylinder No. 2
to penultimate
cylinder
Last cylinder
(Free end)
All cylinders
1) 2)
0.58
−0.58
0.41
−0.41
0.41
−0.41
0.41
−0.58
0.19
−0.19
1)
For engine without torsional vibration damper or front disc or free end PTO.
2)
For engine with torsional vibration damper or front disc or free end PTO.
Contact Wärtsilä Switzerland, if the final measurements exceed the limits given in
the above table.
Measuring Crank Deflection
V2 / 2013-08
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