Today's Message Index:
----------------------
1. 02:33 AM - 912 ULS oil leak (Remi Guerner)
2. 03:47 AM - Re: 912 ULS oil leak (vernon mitchell)
3. 04:05 AM - Re: 912 ULS oil leak (GRAHAM SINGLETON)
4. 04:33 AM - Re: Bing Type 64 Carb. Idle Mixture Setting (Catz631@aol.com)
5. 06:25 AM - Re: 912 ULS oil leak (David Weaver)
6. 06:30 AM - Re: Bing Type 64 Carb. Idle Mixture Setting (Roger Lee)
7. 08:02 AM - Re: 912 ULS oil leak (Scott DeMeyer)
8. 11:25 AM - Re: 912 ULS oil leak (Roger Lee)
Message 1
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| Subject: | 912 ULS oil leak |
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
Message 2
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| Subject: | Re: 912 ULS oil leak |
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
----- Original Message -----
From: "Remi Guerner" <air.guerner@orange.fr>
Sent: Friday, March 11, 2011 12:30 PM
Subject: RotaxEngines-List: 912 ULS oil leak
> <air.guerner@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
>
>
--------------------------------------------------------------------------------
Checked by AVG - www.avg.com
20:32:00
Message 3
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| Subject: | Re: 912 ULS oil leak |
Remi=0AI think you will need to split the crankcase and check inside. We di
d this once =0Aand fitted new O rings which cured the leak (same symptoms a
s yours) Either a =0Acrack has developed in your case or it has got O ring
s which have failed. =0A=0ACause of failure is fretting of the crankcase jo
int. Just like Lycomings do.=0AGraham=0A=0A=0A=0A=0A_______________________
_________=0AFrom: Remi Guerner <air.guerner@orange.fr>=0ATo: rotaxengines-l
ist@matronics.com=0ASent: Friday, 11 March, 2011 10:30:10=0ASubject: RotaxE
"Remi Guerner" <air.guerner@orange.fr>=0A=0AHi all,=0AMy engine has develo
ped an oil leak on cylinder 4 which has grown to the point =0Awhere it must
be fixed now. The leak is located at the junction between the =0Acylinder
barrel and the cylinder head. See attached picture. According to our =0ARot
ax distributor, the oil is coming from the crankcase, then it flows along t
he =0Acylinder studs and escape between the barrel and the head. He does no
t know how =0Ato fix it.=0AMy crankcase P/N is 888364 and S/N 22031. The re
levant drawing of this crankcase =0Aassy is page 5-2 of the May 2010 IPC. T
he drawing shows that there is no gasket =0Anor o-ring to provide a positiv
e seal between the studs of cylinder 4 and the =0Acrankcase. I have studied
SI-912-019 R1 which talk about oil leakage in the =0Acylinder area, but th
is SI affects crankcases from S/N 60010 only. The design of =0Athe crankcas
e has been changed extensively. Therefore this SI is not applicable =0Ato m
y crankcase version.=0AMy question: has anyone experienced this sort of oi
l leak on the old crankcase =0Aversion (crankcase S/N below 27811) ? How to
fix it?=0ARegards=0ARemi Guerner=0AEuropa F-PGKL=0A=0A=0A=0A=0ARead this t
opic online here:=0A=0Ahttp://forums.matronics.com/viewtopic.php?p=333515
#333515=0A=0A=0A=0A=0AAttachments: =0A=0Ahttp://forums.matronics.com//files
====
Message 4
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| Subject: | Re: Bing Type 64 Carb. Idle Mixture Setting |
> How much time do you spend at WOT static? I get 5250 rpm on climb out
at 70-80 mph with my S7S which gives me 5500-5600 rpm WOT level flight
and about 120-125 mph.<
Ollie,
I am getting the same rpm in my Kitfox on take off (5250) as you. Granted
you don't spend much time at static during the take off roll but Rotax
still wants you to have 5200 or above. I asked why at a recent Rotax refresher
course. The instructor told me that it was due to prop induced overload
and case cracking they found on the earlier engines (mine is one) The 912
now has a heavier/stronger case. I don't remember the date when the switch
was made. I have the service bulletin spelling out the 5200 limit but don't
remember the number. ( one of a bunch !) I can get it if you want.
Dick Maddux
Milton,Fl
Message 5
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| Subject: | Re: 912 ULS oil leak |
Approximatley one year ago I resolved a 912 push rod tube oil leak at the h
ead-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 cy
linder 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 applie
d the high temp silicone with an ear swab (difficult area to access).- Th
ere are still no signs of oil leakage after approx. 1 year.- I also corre
cted 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@btinternet.com> wrot
e:
From: GRAHAM SINGLETON <grahamsingleton@btinternet.com>
Subject: Re: RotaxEngines-List: 912 ULS oil leak
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) E
ither a crack has developed in your- case or it has got O rings which hav
e failed.
Cause of failure is fretting of the crankcase joint. Just like Lycomings do
.
Graham
From: Remi Guerner <air.guerner@orange.fr>
Sent: Friday, 11 March, 2011 10:30:10
Subject: RotaxEngines-List: 912 ULS oil leak
.fr>
Hi all,
My engine has developed an oil leak on cylinder 4 which has grown to the po
int 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 fl
ows 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 cran
kcase 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 cylin
der 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 cra
nkcase 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 http://www.matronics.
- - - - - - - - - - -Mats.com/contribution" target="_
blank">http://www.matronics.com/contribution==========
===
Message 6
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| Subject: | Re: Bing Type 64 Carb. Idle Mixture Setting |
On take off rpm you can get higher rpms by a shallower take off and less or no
flaps. Their 5200 rpm on take off will usually get you close to 5800 rpm WOT flat
and level. Most of us try and shoot for around 5000 on take off, but this
is a little lower than the SB. Rotax was really trying hard to get people away
from the 4500-4800 rpm take offs and WOT settings at cruise of less than 5500
(i.e 5000-5300). Having a prop set to only get 5300 or less WOT flat and level
is stress on the crank case and other parts. If you can see 5500-5600 WOT flat
and level then you should be good. You also should not be using less than 5000
for extended cruise settings. A good place to be is to have the prop set to
get engine rpm of 5500-5600 WOT flat and level and cruise between 5000-5300
rpm. Better on the higher rpms if you use 100LL. These setting should give you
the best all around performance for a fixed pitch prop. If you have an in air
adjustable then you can dial in what works well during the different stages of
your flight.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=333530#333530
Message 7
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| Subject: | Re: 912 ULS oil leak |
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@orange.fr> wrote:
> From: Remi Guerner <air.guerner@orange.fr>
> 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" <air.guerner@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 -
> FAQ,
> - MATRONICS WEB FORUMS -
> List Contribution Web Site -
> -Matt
> Dralle, List Admin.
>
>
>
>
Message 8
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| Subject: | Re: 912 ULS oil leak |
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.
--------
Roger Lee
Tucson, Az.
Light Sport Repairman - Maintenance Rated
Rotax Repair Center
Home 520-574-1080 TRY HOME FIRST
Cell 520-349-7056
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=333562#333562
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