Effectivity: 914 Series BRP-Powertrain page 7-13
OM Edition 2 / Rev. 0 April 01/2009
d04479.fm
Backlash On the gearbox version with overload clutch the design incorpo-
rates a friction damped free play at the dogs to warrant proper en-
gine idling. Due to this backlash at the dogs a distinct torsional
impact arises at start, stop and at sudden load changes, but it will
remain harmless.
Vacuum pump or
hydraulic gover-
nor
At configuration 3 and/or 4.
Alternatively either a vacuum pump or a hydraulic governor for
constant speed propeller can be used. The drive is in each case
via the propeller reduction gear.
NOTE: Transmission ratio between crankshaft and hy-
draulic governor or vacuum pump is 1.842 i.e.
the speed of the hydraulic governor or vacuum
pump is 0.54 of engine speed.
gear ratio
crankshaft: propeller shaft 2.43:1
propeller shaft: hydraulic governor/
vacuum pump
0.758:1
crankshaft: hydraulic governor/
vacuum pump
1.842:1
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