AIRCRAFT MAINTENANCE MANUAL
DFE-AMM-AR1
Rev. 1 – 07/24/2014
4-2
Lubrication system description
The Rotax 912 engine is provided with a dry sump forced lubrication system. The oil pump pulls the
engine oil from the oil tank attached to the firewall via the oil cooler and then forces it through the oil filter to
the lubrication points in the engine.
The oil emerging from the lubrication points accumulates on the bottom of the crankcase and is
forced back to the oil tank by the blow-by gases.
The oil tank is equipped with a vent hose.
The engine lubrication system is further described in the documentation supplied with the engine.
Figure 4-2 –
Rotax Engine lubrication system
Cooling system description
The cooling system uses two forms of cooling. The cylinder heads are liquid cooled and the cylinders
are ram air cooled. The radiator is located in the front of the lower engine cowling. The coolant is forced
through the radiator by a water pump, driven from the crankshaft to the cylinder heads. From the top of the
cylinder heads the coolant passes on to the expansion tank which allows for coolant expansion. The
expansion tank is closed by a pressure cap with an excess pressure valve and return valve. When the
temperature rises the coolant creates excess pressure, a relief valve opens and the coolant flows through a
thin hose to the overflow bottle mounted on the firewall.
The engine cooling system is more completely described in documentation supplied with the engine.
Figure 4-3 –
Rotax Engine cooling system
