Reference
Modification no.
- 0 -
Page
66
Date
1997 02 01
Main
914 F
01476
10)Auxiliary units
10.1) Hydraulic governor
The engine version 914 F3 will be supplied with a fitted hydraulic governor for usage
with a constant speed propeller. The hydraulic governor is retrofitable on engine
version F2 and F4 by adding the drive kit for the governor in prop gear and crankcase
and oil supply line to governor and prop shaft (on F2 and F4 engine version).
➪ on version 914 F2 the hollow prop shaft has to be exchanged also for the correct
one
➪ on version 914 F4, the prop shaft can remain as it is of the same design with the
exception that the inside bore is plugged. After removeal of the plug the propeller
shaft is suitable for use with governor.
â—† NOTE: Installation of both, the hydraulic governor and vacuum pump is not
possibel.
Transmission ratio crankshaft: prop shaft ................................ 51: 21, i = 2,4286
Transmission ratio propshaft: governor ................................... 22: 29, i = 0,7586
Direction of rotation ................................................................... i = 1,842
â—† NOTE: The reduction ratio between crankshaft and vacuum pump or hydrau-
lic governor is 1,842 i.e. these units run with 0,54 of engine speed
reduction ratio total.................................. anti-clockwise, looking at governor flange
10.2) Vacuum pump
It is possible to install a vacuum pump for employment of an inertial navigation system.
For that the drive kit for the vacuum pump has to be retrofitted on prop gearbox and
crankshaft.
â—† NOTE: Installation of both, the vacuum pump and hydraulic governor is not
possible.
Transmission ratio: Vacuum pump and hydraulic governor are driven the
same way and therefore have the same total reduction
ratio. See hydraulic governor.
10.3) Mechanical rev. counter
Drive for the mechanical rev-counter from camshaft. The engine is prepared for later
installation of the rev-counter shaft. Just remove rev-counter cover, install retro-fit
items and connect flexible shaft to indicating instrument.
The total transmission ratio from crankshaft to flexible shaft i = 4
10.4) External Alternator
The internal generator can supply approx. 20A DC. To meet an increased energy
demand, installation of an external 40A alternator is possible, either at serial produc-
tion or as retrofit kit later on.
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