Maintenance
4103−1/A1
Winterthur Gas & Diesel Ltd.
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5) Use the micrometer to measure the lead wire.
6) Calculate as follows:
D The full tooth backlash: f = f1 + f2
D The obliquity: Df = a1 − b1 or a3 − b3.
The permitted difference of the tooth profile parallelity is between 0.0% and 0.2%
across the width of the tooth.
4. Performance
Do a check of the performance of the gear train after commissioning as follows:
1) Apply a thin layer of oil resistant engineer’s blue ink to three of the teeth on each of
the gear wheels.
2) Use the turning gear to turn the engine.
3) Do a check of the marks on the gear wheel teeth and driving wheel teeth. This is
make sure that the teeth engage correctly and are parallel.
2015
Running and Backlash Clearances and Tooth Condition
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