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Some questions about oil filters and oil

in 912 / 914 Technical Questions 4 hours ago

I am a new maintenance worker. I work in China but my English is not very good. Please forgive me.

When I was doing the pre-flight inspection, I found some paste-like sludge on the oil cover.

Does this affect the flight?

What are the causes and preventive measures for this phenomenon?

My colleague tightened the oil filter when changing it. Is there a problem with this method? Will there be oil leakage?

I hope all maintenance workers can help answer my questions.

10929_1__20250504215447.jpg (You do not have access to download this file.)

  • Re: Some questions about oil filters and oil

    by » 3 hours ago

    Hi, your English is very good. The photo appears to show moisture in the oil. This is common if the oil temperature is too low in flight. Ideally you want the oil temperature to exceed 100 degrees Celsius for at least part of the flight to boil off any moisture in the engine, otherwise it will condense out in the oil tank and you will see it on the lid.

    I didn’t quite understand the problem with tightening the oil filter. When the oil filter is changed during a service, the new filter should be tightened so that it touches the mating surface and then a further 270 degrees. This is all written in the Rotax maintenance manual that you can download. 

      
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