Maintenance
3103−1/A1
RT-flex58T-E
Winterthur Gas & Diesel Ltd.
1/ 3
Tool: Key to Illustrations:
1 Crankshaft checking equipment 94305 1 Flywheel
(dial gauge) 2 Pinion
1. General
Regular crankweb deflection measurements according to the intervals defined by
the class rules are sufficient. Detailed alignment measurements might become ne-
cessary only in case of abnormalities, like
− significant change of crankweb deflection measurement results compared to
the set of previous measurements.
− bearing temperature alarms or bearing damage.
− after replacing main bearing shells and again after approx. 100 service hours.
− in case the ship has touched ground.
In any such cases it is recommended to contact Wärtsilä for support.
The checking equipment 94305 is clamped between the crank webs into the pro-
vided center punch marks. When turning the crankshaft, the change in distance
between the crank webs can be read from the dial gauge as it indicates any open-
ing or closing up. The smaller the variation the better the alignment of the crank-
shaft. Thereby, however, the function of the checking equipment, i.e. the sign on
dial gauge “+” (standard) or “−” must be taken into consideration.
2. Conditions for measuring
D Indicator valves must be open.
D The ship must be floating freely and lying in the water as horizontal as
possible.
D The crankshaft must rest perfectly on all the main bearings.
A
WCH00339
2
1
TURNING GEAR
ON EXHAUST SIDE
2.1 Influences on measuring
D Engine cold or at service temperature.
D The difference in temperature between the lubricating oi
sump tank and the seawater.
D Loaded condition of the ship (draught).
D Strong sunshine.
It is recommended to include these data in the records.
3. Measuring procedure
Despite the ordinary rotation direction of the engine, th
crankshaft must always be turned in such a manner tha
flywheel 1 and pinion 2 of the turning gear are rotating a
indicated by the arrows.
V2 / 2013-08
Crankshaft
Measuring Crank Deflection
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