Maintenance
3103−1/A1
Winterthur Gas & Diesel Ltd.
1/ 3
Measuring Crank Deflection
Tools:
1 Crankshaft equipment (dial gauge) 94305
1. General
It is sufficient to regularly measure the crank-web deflection in accordance with the
intervals given in the class rules. In the conditions that follow, it can become
necessary to measure the dimensions:
D Important change of crank-web deflection results compared to the set of previous
results.
D Temperature alarms of bearings, or damage to bearings.
D After the main bearing shells are replaced and again after approximately
100 service hours.
D If the ship has touched the sea bed.
In such conditions, it is recommended that you speak to WinGD Ltd.
The crankshaft equipment (94305) is held between the crank webs in the center
punch marks. When the crankshaft turns, the change in distance between the crank
webs can be read from the dial gauge. This shows the distance the crank web has
opened or closed. The smaller the difference the better the crankshaft is aligned. But,
you must think about the function of the crankshaft equipment, i.e. the signs on dial
gauge + (standard) −.
2. Conditions to Measure
The conditions to measure crank-web deflection are as follows:
D The indicator valves must be open.
D The ship must float freely in the water as horizontal as possible.
D The crankshaft must touch all the main bearings.
The conditions that follow will have an
effect when you do the procedure to
measure the crank-web deflection:
D The engine is cold or at service
temperature.
D The difference in temperature between
the lubricating oil sump tank and the
seawater.
D The loaded condition of the ship (the
draught).
D Strong sunshine.
It is recommended that you include these
data.
3. Procedure
Note: During the procedure, the flywheel
(1, Fig. 1) and pinion (2) of the
turning gear must turn in the
directions shown.
Crankshaft
2015
TURNING GEAR
ON EXHAUST SIDE
WCH02320
1
2
Fig. 1
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