Turbo oil leak after 1st engine run

If you aren’t sure of the source of the leak, you may want to invest in a UV dye kit.  The dye is fairly inexpensive at about $10 for a bottle.  And, if you don’t own a UV light, you can buy complete kits with dye and light for $20 or so.  That is one of the fastest ways to find a slow leak.

A less precise, but even cheaper way, is to use talcum powder.  Clean the area well with alcohol or similar solvent and then dust with talcum powder.  Fire up the engine and watch for the first brown spot to appear in the powder.  You have to watch carefully as the leak can spread fast and, obviously, this is especially challenging and hazardous on an engine with a propeller attached.

I have no idea on the check valve numbers, probably need to talk to Lockwood or Advanced Powerplant to get that information.  I do know that oil leaks can be hard to precisely pinpoint and you can’t decide how to solve a leak until you know exactly where it originates.

Hello Corey,

If your engine is not listed in the ASB (Alert Service Bulletin) released by Rotax, then it is not affected by this ASB. While Rotax did not specifically list the part number for the affected check valve housing in the bulletin, all the engine serial numbers mentioned were for engines manufactured in 2025.

That said, since you have an oil leak and your engine is practically new, and this issue is similar to what was described in the ASB, I recommend that you still fill out a CSIR (Customer Service Information Report) for your engine by clicking on this link:
https://www.rotax-owner.com/en/support-topmenu/csir-service-information-report

I also suggest that you remove the air filter and inlet tube, and inspect the inlet of the turbo for any oil on the turbo impeller (cold section). If you find any oil, please take photos and note this in the CSIR.

After submitting the CSIR, please contact your local Rotax dealer or Service Center to discuss the issue further. You can find your local Rotax dealer or Service Center by clicking on this link:
https://dealerlocator.flyrotax.com/

Best regards,
Rotax-Owner

Thanks for the advice. I have checked the impeller/cold side and no oil or residue was apparent.

I'll file a CSIR tonight.

Hi Corey

Please check the oil pump, specifically the oil seal between the outer scavenge pump impellers and the main oil pump body.  In some cases a small bit of damage on the oil seal inner lip can lead to oil bleed into the turbo overfilling the center section.  Oil can then go into the cold and hot side.  If you have any oil in the cold side (compressor side) you will start to see traces of oil at the blow off valve area.  

Cheers