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9. Rotax 912 / 912S engine maintenance
All essential information and operational instructions for the Rotax 912/912S engine are
included in the engine maintenance manual which was delivered to you with your airplane.
Keep the engine clean and watch for oil leaks which can indicate the necessity of expert
maintenance of the engine. Here we introduce only the basic procedures for the engine
maintenance.
9.1. Oil change
- when changing oil replace the oil filter as well
- oil needs to be changed for the first time after the first 25 flight hours. The oil in the gearbox
has to be changed when changing engine oil
- oil has to be changed every 100 flight hours or once a year, whichever comes first
- the amount of oil refill for changing is 3 liters
The engine maintenance manual for Rotax 912 series engines requires that after each oil
change the old filter before its disposal has to be cut open. The filter should be unfolded and
looked through for any metallic splints, scraps, etc. which could be a presage of the engine
failure.
We recommend letting this work have done by an authorized technician.
9.2 Spark plugs
The inspection and cleaning of the spark plugs should be done every 100 hours of engine
operations or when the starting of engine is getting worse. The condition of the spark plugs
can indicate state of the engine, improper operational values or other flaws (temperature,
fouling of the air filter, untightness of valves, etc.). Correct color of the spark plugs is light
colored to brown. Rough starting or increased magneto drops are signs that it is time to
change the spark plugs.
Spark plugs have to be replaced every 200 hours of engine operations at the periodic
inspections.
The Rotax company recommends applying heat-conducting compound to the spark plug
threads prior to installing the plugs. If you do not have such compound, we recommend that
you let an authorized company carry out spark plug replacement, or get spark plugs which
are already covered with such paste.
9.3 Fuel
For the type of fuel that can be used refer to the engine operator’s manual.
9.4 Liquid coolant
Periodically verify the level of coolant.
Refer to the engine operator’s manual for details on engine liquid coolant specifications.
WARNING
Do not open the liquid coolant tank cap while the engine is still hot.
You can get burnt easily.
Flight Manual Page 39 of 40
