48
Operation
Propeller shaft brake
In certain conditions, the propeller can make the pro-
peller shaft rotate when the engine is stopped. This
parasitic rotation is uncomfortable, and can damage
the reversing gear since its oil pump, which is driven
by the input shaft, is stationary together with the
engine.
The propeller shaft can be permitted to rotate with
a stationary engine for up to 6-8 h. After this, the
engine must be started and run for at least 5 min to
lubricate and cool the reversing gear.
If the shaft is likely to rotate faster than in normal
operation, such as when sailing, a temperature gau-
ge should be installed to monitor the oil temperature.
Maximum permissible temperature is 95°C for the ZF
reversing gear.
When the above-mentioned rules can not be met,
or if you want to stop the shaft for comfort reasons,
a shaft brake has to be installed. On isolated occa-
sions, the propeller shaft flange can be locked me-
chanically by some suitable means.
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