JonathanMilbank
Joined: 14 Apr 2012
Posts: 389
Location: Aberdeen area
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 Posted: Wed Sep 04, 2024 8:59 am Post subject: Rotax 912ULS oil consumption possible answer |
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Someone with a lot of Rotax engine experience has suggested that one or more piston oil scraper rings may have been installed the wrong way around. If so, I'm just going to live with it and accept higher oil consumption.
https://www.rotax-owner.com/en/912-914-technical-questions/8333-oil-tank-breather
I'm going to investigate the overflow/breather pipe for the oil tank and see whether it has somehow become partly obstructed by "gunge" deposits or something else. I'll also enlarge the hole drilled into its side near the end, using a blade to cut a slot.
For more than 100 flying hours, virtually no oil has dripped into the little catch pot, into which the breather pipe hangs.
Fingers crossed!
On Sunday 9th September I opened the engine cowls to inspect the breather pipe and found no obstruction. So now I don't know what else to do, having tried "everything known to man" as reported in my original post. If for example there's a broken oil ring on a piston, which I highly doubt, then I'm just going to accept the status quo.
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