79-00-00
page 6
May 01/2007
Effectivity 912/914 Series
Edition 1 / Rev. 0
d02628
BRP-Rotax
Maintenance Manual
On the ROTAX 912/914 Series, which is equipped with a hydraulic governor, the
governor (35) is supplied with the required forced oil via oil line (33). From the
governor flange (34), the oil flows to the gear pump in the governor, which raises
the pressure to approx. 23 bar (330 p.s.i.). According to the lever position of the
governor, oil is pumped via oil duct (36) and through oil inlet flange (37) and into
the hollow propeller shaft (38) to the variable pitch propeller or drained into the
crankcase through channel (39), thus changing pitch accordingly. The surplus
oil returns back to the crankcase via the duct.
The engine oil emerging from all lubrication points flows to the bottom of the
crankcase (40) and is pressed back into the oil tank by the crankcase gases
(blow-by – gases) via the ring hose nipple (41) and the oil return line (42). The
tangential feed of the returned oil effects separation of oil from air via the screen
(43). As a result, the intake system (2) is supplied with oil which is to a large
extent free of air.
The oil tank is vented via the connection (44) in the intake filter into a suitable
receptacle or to the outside.
For oil change, the oil is drained by removing drain plug (45).
â—† NOTE: Only on 914 Series: Oil pump rotor (46) of the suction oil
pump.
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