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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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 Posted: Fri Mar 11, 2011 2:30 am Post subject: 912 ULS oil leak |
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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
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vernon11
Joined: 03 Aug 2010
Posts: 14
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| Posted: Fri Mar 11, 2011 3:47 am Post subject: 912 ULS oil leak |
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Yes We have the same problem on our 912Ul upgraded to 95 HP I originally
thaught it was the head gasket. I would be very interested to find out how
to sort the problem
Vernon.
South Africa
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grahamsingleton(at)btinte
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| Posted: Fri Mar 11, 2011 4:05 am Post subject: 912 ULS oil leak |
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Remi
I think you will need to split the crankcase and check inside. We did this once and fitted new O rings which cured the leak (same symptoms as yours) Either a crack has developed in your case or it has got O rings which have failed.
Cause of failure is fretting of the crankcase joint. Just like Lycomings do.
Graham
From: Remi Guerner <air.guerner(at)orange.fr>
To: rotaxengines-list(at)matronics.com
Sent: Friday, 11 March, 2011 10:30:10
Subject: RotaxEngines-List: 912 ULS oil leak
--> RotaxEngines-List message posted by: "Remi Guerner" <air.guerner(at)orange.fr (air.guerner(at)orange.fr)>
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.jpghttp://www.matronics. -Mats.com/contribution" target="_blank">http://www.matronics.com/contribution==============
[quote][b]
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mortweaver(at)sbcglobal.n
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| Posted: Fri Mar 11, 2011 6:25 am Post subject: 912 ULS oil leak |
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Approximatley one year ago I resolved a 912 push rod tube oil leak at the head-tube intersection with 3M Fire Barrier 2000+ silicone caulk. The low pressure oil leak slowly got bad enough that I either had to remove the cylinder head and correct the problem or find a quick fix. I flushed area with MEK from a syringe to remove all oil and grime residue and then applied the high temp silicone with an ear swab (difficult area to access). There are still no signs of oil leakage after approx. 1 year. I also corrected a small case leak immediately posterior to where the vacum pump mounts. This particular grade of silicone has structural properties similar to RTV (some times labeled as Aquarium Cement). Air Spruce is a supplier.
Dave Weaver N912GR
--- On Fri, 3/11/11, GRAHAM SINGLETON <grahamsingleton(at)btinternet.com> wrote:
From: GRAHAM SINGLETON <grahamsingleton(at)btinternet.com>
Subject: Re: 912 ULS oil leak
To: rotaxengines-list(at)matronics.com
Date: Friday, March 11, 2011, 6:02 AM
Remi
I think you will need to split the crankcase and check inside. We did this once and fitted new O rings which cured the leak (same symptoms as yours) Either a crack has developed in your case or it has got O rings which have failed.
Cause of failure is fretting of the crankcase joint. Just like Lycomings do
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sdemeyer
Joined: 31 Jul 2009
Posts: 45
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| Posted: Fri Mar 11, 2011 8:02 am Post subject: 912 ULS oil leak |
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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 <air.guerner(at)orange.fr> wrote:
| Quote: | From: Remi Guerner <air.guerner(at)orange.fr>
Subject: 912 ULS oil leak
To: rotaxengines-list(at)matronics.com
Date: Friday, March 11, 2011, 2:30 AM
--> RotaxEngines-List message
posted by: "Remi Guerner" <air.guerner(at)orange.fr>
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 -
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Roger Lee
Joined: 10 Jan 2006
Posts: 1464
Location: Tucson, Az.
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| Posted: Fri Mar 11, 2011 11:22 am Post subject: Re: 912 ULS oil leak |
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This really isn't a tough problem. From just what you described and if it really is coming from between the cylinder and head then it may only need one of two things. First you can try the easy thing. Just remove the valve cover and loosen each of the 4 nuts one at a time and re-torque them. Torque them to 90 in/lbs then 180 degrees more.
This is the easy fix if it works and it might work just fine.
If not then you'll need to pull off just the head and get a little lapping compound and re-seat the head against the metal cylinder surface. Then torque them down. Look in the Rotax Heavy Maint. manual, section 72-00-00, page 92, paragraph 3.16.4 on cylinder head fitting. (revision page dated Oct. 1 , 2010).
The first fix will only take 15 min. start to finish.
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_________________
Roger Lee
Tucson, Az.
Rotax Instructor & Rotax IRC
Light Sport Repairman
Home 520-574-1080 TRY HOME FIRST
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Remi Guerner
Joined: 14 Dec 2010
Posts: 284
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| Posted: Thu Mar 17, 2011 2:43 am Post subject: Re: 912 ULS oil leak |
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Thank you Roger for your response.
I have tried your first suggestion (retorquing the studs) in the past without success. I will try it again using the latest torquing instructions from Rotax but I doubt it will be effective.
Your second suggestion is away from the point : re-sealing the surface between the cylinder barrel and the head would only help in case of hot gases leaking from the combustion chamber, which is not what I experienced. In my case, I believe the leaking oil is coming from either the crankcase or from inside the valve cover, then it flows along the cylinder studs and escape between the barrel and the head.
Regards
Remi
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