---------------------------------------------------------- RotaxEngines-List Digest Archive --- Total Messages Posted Wed 02/20/13: 3 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 05:23 AM - Re: Oil leak 912ULS (Thom Riddle) 2. 05:56 AM - Re: Oil leak 912ULS (Roger Lee) 3. 04:56 PM - Re: Oil leak 912ULS (Peter Thomson) ________________________________ Message 1 _____________________________________ Time: 05:23:04 AM PST US Subject: RotaxEngines-List: Re: Oil leak 912ULS From: "Thom Riddle" I had a small nuisance oil leak somewhere in the front of the 912-F3 (1100+ hours) in my Katana last summer. It was not enough to ground the airplane. The leak would not appear on full power ground run-up but only after flying. After many many hours of one-at-a-time removal of everything possible, including gearbox, inspection, re-installing, and test-flying, I found two leaks. One was the fuel pump gasket and the other was the oil pressure sending unit joint where it threads into the oil pump. The fuel pump gasket, upon inspection did have a bad spot on it and replacing that stopped that particular leak. I suspect that gasket/spacer was damaged at some point during service when it is removed to check fuel pump cam in gearbox. On the oil pressure sending unit, during prior service (before the leak discovery) I had been careful to re-torque to spec the NPT threaded fitting into the fuel pump. Apparently the "correct" torque spec is not enough to seal at this joint, but since that was the only possible source left, I tightened it up about 1/2 turn more and that stopped it. I'd hate to tighten it too much and crack the oil pump housing $$$$$. -------- Thom Riddle Buffalo, NY (9G0) Kolb Slingshot SS-021 no engine FOR SALE Diamond Katana DA20-A1 Rotax 912 F3 Don't worry about old age... it doesn't last very long. - Anonymous Read this topic online here: http://forums.matronics.com/viewtopic.php?p=394653#394653 ________________________________ Message 2 _____________________________________ Time: 05:56:13 AM PST US Subject: RotaxEngines-List: Re: Oil leak 912ULS From: "Roger Lee" Hi Peter, If it is on the very front of the engine then and this is a tractor prop then it isn't a valve cover seep because it won't go to the front of the engine, but farther back. If it's on the right side it isn't the oil filter. The oil pump housing rarely leaks, but I wouldn't rule it out totally. I would clean the engine and then sit for 30 min. and let it run at 4000 rpm on the ground. The problem with an in flight check is the high pressure air over the engine tends to spread it too much and make it hard to find. If you still can't find it spray some foot powder on the front of the engine and any leak will show up like a red flag. The most common are: 1. The bottom of the gearbox. It would need removal and re-sealed. It isn't hard to do.Re-seal it with Loctite 5910 (European) or 598 (US) or Permatex "The Right Stuff". 2. It it is the older AC or Pierberg fuel pump then it is coming out of the weep hole on the bottom of the pump and will need a new pump. (very common) I'll be doing this very thing this morning. A new pump is $171. Other less likely are the oil pressure sender that was loose, but if it was tight to start with probably isn't the issue. Any oil cooler fittings up front, even if they look clean put a wrench on them or check the hose clamps. The high pressure air flow pushes it off the fitting towards the back and gives you a false location. My money is still on the first two common if this just started to leak and wasn't before. -------- Roger Lee Tucson, Az. Light Sport Repairman - Maintenance Rated Rotax Repair Center - Heavy Maint. Rated Home 520-574-1080 TRY HOME FIRST Cell 520-349-7056 Read this topic online here: http://forums.matronics.com/viewtopic.php?p=394656#394656 ________________________________ Message 3 _____________________________________ Time: 04:56:54 PM PST US Subject: RotaxEngines-List: Re: Oil leak 912ULS From: Peter Thomson Many thanks to all who gave a wealth of information on finding this. I WILL track it down and post result ! ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rotaxengines-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RotaxEngines-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rotaxengines-list Browse Digests http://www.matronics.com/digest/rotaxengines-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.