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BW TRANSMISSIONS
These manual transmissions rotate opposite to the engine when in for-
ward gear.
Shifting effort is very low.
The input power on the BW3
is transmitted to the output shaft by helical spur gears when in for-
ward.
In reverse this task is taken over by a high performance roller
chain.
The unit also incorporates a servi cone-type clutch.
The BW7
and BW12 transmit their power with casehardened helical gears and in
reverse there is an intermediate gear.
The reversing process on these
is carried out by a servo double disc system.
LUBRICATION
1.
Fill the transmission with 20 to 40 SAE weight engine oil,
the
same as is used in the engine.
2.
Oil capacity
BW3 approximately 0.35 liter
BW7 approximately 1.0 liter
BW12 approximately 1.0 liter
3.
Check the oil level daily with the engine stopped.
The level must
be between the upper and lower dipstick marks when the dipstick is
completely screwed/inserted into the housing.
4.
Change
the
oil
initially
after
the
first
30
hours,
thereafter
every 250 hours, once per year minimum.
The BW7 and BW12 have a
dr ain plug for oil removal.
Oil may also be removed by suction
through the dipstick tube, where oil is added.
5.
Operating oil temperature must not exceed l20·C (250·F).
OPERATION
1.
Normal shifting should be done below 1500 RPM.
2.
The BW3 may be locked in reverse when sailing or freewheeled in
neutral.
3.
The BW7 and BW12 may be locked in either forward or reverse when
sailing or freewheeled in neutral.
SERVICE
1.
Never loosen the shift lever cover screws, except in the course of
qualified servicing, as this upsets a critical adjustment.
2.
Disassembly of the transmission in the field is not recommended.
If an overhaul or repair
is needed,
the work should be done by
Westerbeke or an authorized Westerbeke service center.
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