Diagnosing Engine Seizure on Rotax 912UL

Re: Diagnosing Engine Seizure on Rotax 912UL

by MARK JACKSON » 11 years ago

MARK JACKSON

12 332 11

Hi Randy

No one will ever know unless they strip and examine the engine themselves. Other than that, it will be just a guess.

Mark

Re: Diagnosing Engine Seizure on Rotax 912UL

by Tom Johnston » 11 years ago

Tom Johnston

0 8 0

I would be curious to know when you split the case if it spun a main bearing and cut off oil supply to the connecting rod.

Re: Diagnosing Engine Seizure on Rotax 912UL

by Rob Seaton » 11 years ago

Rob Seaton

3 1.32k 251

That engine serial number does have service bulletin for replacing the oil pump.
The drive pin could break causing a loss of oil pressure.
Was SB-912-032 complied with?
Spun main bearings are very rare in the 912 series, even with a total lack of lubrication and excessive contamination they tend remain in place.

Re: Diagnosing Engine Seizure on Rotax 912UL

by Randy Engler » 11 years ago

Randy Engler

2 9 0

Thanks for the info Rob, the log book doesn't show any indication of that SB being complied with. I'm out of town right now but once I get home I will do some further disassembly and check out the oil pump drive pin.