--> RotaxEngines-List message posted by: Scott DeMeyer I had the exact same leak in the same exact place but after serious investigation it turned out to be a combination of leaking valve cover seal and leaking oil hose on the bottom of engine. Replaced valve cover seal and fixed oil hose leak and no more oil between the cyl head and cylinder. I was very worried my cyl head was warped but turns out to be fine. Scott --- On Fri, 3/11/11, Remi Guerner wrote: > From: Remi Guerner > Subject: RotaxEngines-List: 912 ULS oil leak > To: rotaxengines-list@matronics.com > Date: Friday, March 11, 2011, 2:30 AM > --> RotaxEngines-List message > posted by: "Remi Guerner" > > Hi all, > My engine has developed an oil leak on cylinder 4 which has > grown to the point where it must be fixed now. The leak is > located at the junction between the cylinder barrel and the > cylinder head. See attached picture. According to our Rotax > distributor, the oil is coming from the crankcase, then it > flows along the cylinder studs and escape between the barrel > and the head. He does not know how to fix it. > My crankcase P/N is 888364 and S/N 22031. The relevant > drawing of this crankcase assy is page 5-2 of the May 2010 > IPC. The drawing shows that there is no gasket nor o-ring to > provide a positive seal between the studs of cylinder 4 and > the crankcase. I have studied SI-912-019 R1 which talk about > oil leakage in the cylinder area, but this SI affects > crankcases from S/N 60010 only. The design of the crankcase > has been changed extensively. Therefore this SI is not > applicable to my crankcase version. > My question:  has anyone experienced this sort of oil > leak on the old crankcase version (crankcase S/N below > 27811) ? How to fix it? > Regards > Remi Guerner > Europa F-PGKL > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=333515#333515 > > > > > Attachments: > > http://forums.matronics.com//files/p3090011a_177.jpg > > > > > RotaxEngines-List Email Forum - > FAQ, >    - MATRONICS WEB FORUMS - > List Contribution Web Site - >               -Matt > Dralle, List Admin. > > > > _-============================================================ _-= - The RotaxEngines-List Email Forum - _-= Use the Matronics List Features Navigator to browse _-= the many List utilities such as List Un/Subscription, _-= Archive Search & Download, 7-Day Browse, Chat, FAQ, _-= Photoshare, and much much more: _-= _-= --> http://www.matronics.com/Navigator?RotaxEngines-List _-= _-============================================================ _-= - MATRONICS WEB FORUMS - _-= Same great content also available via the Web Forums! _-= _-= --> http://forums.matronics.com _-= _-============================================================ _-= - List Contribution Web Site - _-= Thank you for your generous support! _-= -Matt Dralle, List Admin. _-= --> http://www.matronics.com/contribution _-============================================================