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Post by ChiMike on Mar 14, 2024 21:36:24 GMT
The 600 hour recommended Rotax gearbox inspection should not be ignored. My Rotax mechanic stated we needed to do it for this year’s annual. Neither of us expected a problem. We sent it to Lockwood—they have the tools and expertise. And they said I had problems due to gear wear stated to be related to use of Av-gas instead of unleaded fuels. Bottom line, I now have a rebuilt box. The housing was fine!
Has anyone else had an issue—or even had the inspection done?
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Post by LSA Flyer on Mar 15, 2024 16:58:04 GMT
I had my first 912ULS overhaul at about 400 hours and my second box on a 912is go at about 200 hours. Av gas may be a contributor but inadequate cooling is more likely. Rotax increased the oil jet flow to improve cooling and Lockwood incorporates that in any rebuild. The injected engines and the Turbocharged versions run hotter than the ULS. Increased vibration is a typical symptom. If you got 600 hours, good job!
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Post by Flocker on Mar 15, 2024 21:21:55 GMT
I had an issue with mine prior to Rotax adding the "spray nozzle" in the gearbox. Been fine ever since. It was well documented on this site.
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bigmo
Junior Member
Posts: 87
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Post by bigmo on Mar 15, 2024 22:45:35 GMT
I need to re-read the technical docs again, but I thought that service interval if one had the overload clutch and ran 70% or greater MOGAS was 1000 hours?
I’m optimistically thinking that 95% MOGAS, and a well-balanced three blade prop can help me get to that goal.
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Post by ChiMike on Mar 16, 2024 0:35:49 GMT
Flocker—I looked for posts—nada.
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Post by LSA Flyer on Mar 16, 2024 2:09:54 GMT
I need to re-read the technical docs again, but I thought that service interval if one had the overload clutch and ran 70% or greater MOGAS was 1000 hours? I’m optimistically thinking that 95% MOGAS, and a well-balanced three blade prop can help me get to that goal. I believe the 912IS calls for 1,000 hour inspection with unleaded fuel. The 912 gearbox housing was redesigned to add a oil squirter and some additional space between washers. The premature failures were primarily on early 912 injected engines. |
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Post by Flocker on Mar 16, 2024 15:49:02 GMT
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Post by ChiMike on Mar 17, 2024 13:16:58 GMT
Thank you.
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Post by ChiMike on Mar 20, 2024 14:22:58 GMT
I flew yesterday. As I’d not noticed any ‘issues’ prior to the inspection I was unsure what if any differences I would note at ground test and flight test. Everything ran very smoothly and seem to be like what I had experienced before. One thing I did notice is that when I stopped the engine there was a better smoothness, than the somewhat jerky prop stop associated with Rotax engines.
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