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09-09-2016, 03:44 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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Muffler / Oil Drain Fitting - Clearance
I?m doing the Annual Condition Inspection on my 12 and notice the 90? fitting on the bottom of the crankcase for the oil return line is almost touching the muffler. See photo... I don?t recall seeing this on the previous inspection. Any thoughts?

__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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09-09-2016, 03:52 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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Quote:
Originally Posted by Piper J3
I?m doing the Annual Condition Inspection on my 12 and notice the 90? fitting on the bottom of the crankcase for the oil return line is almost touching the muffler. See photo... I don?t recall seeing this on the previous inspection. Any thoughts?

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It looks to me like that hose is not routed per the KAI.
The fitting should be pointed almost directly aft with the hose routing to the oil tank via a path upward behind the engine.
The clearance is close for the normal routing, but not that close.
Also make sure all of your springs are in good shape and that the muffler is properly seated on the pipes.
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Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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09-09-2016, 05:11 PM
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Join Date: Apr 2015
Location: Olympia WA
Posts: 173
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Jim;
I had the exact same problem on my -12 that I purchased. I was certain the oil line fitting was going to rub thru after chafing on the muffler, and drain all my oil out during flight. After much research, I discovered that a banjo type fitting should be used there. It provides much more clearance between the line and the muffler body. Don't have any pics, but just look in the rotax info for the banjo type fitting in the bottom of the crankcase. My local A&P installed it. I sleep better now.
Tom O.
__________________
Tom O.
RV-12, bought flying
Hoskins Field, 44T
Olympia WA
the bitterness of poor quality
lingers long after the cheap
price is forgotten.
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09-09-2016, 07:03 PM
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Join Date: Jul 2005
Location: Hubbard Oregon
Posts: 9,035
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If the 90 degree hose is installed correctly it has worked just fine on 100's of RV-12's.
If the banjo fitting is used the hose has to be routed to the side, and the hose path ends up being less than direct to the oil tank.
__________________
Opinions, information and comments are my own unless stated otherwise. They do not necessarily represent the direction/opinions of my employer.
Scott McDaniels
Van's Aircraft Engineering Prototype Shop Manager
Hubbard, Oregon
RV-6A (aka "Junkyard Special ")
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09-10-2016, 03:48 AM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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Thank you Scott for quick reply. I will check engine install drawings for drain hose routing and see if I can turn fitting more aft and run the hose up the backside of the engine.
I may also remove the muffler and make a small "smile" dent to increase clearance for the 90? fitting. This looks like a good option...
__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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09-11-2016, 05:48 AM
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Join Date: Nov 2008
Location: Gloversville, NY
Posts: 1,587
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Jim,
If the muffler and the exit fitting and hose are correctly positioned (check the plans) there will be sufficient clearance. It doesnt seem like a good idea to me to make a dent in the muffler.
John
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John Peck, CFII, A&P, EAA Tech Counselor, Flight Advisor.
?Master Pilot? Award, UFO Member.
RV-12 N37JP 120176 Flying since 2012.
One Week Wonder Build Team, OSH 2018.
VAF paid through 10/2019.
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09-11-2016, 09:13 AM
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Join Date: Apr 2015
Location: Olympia WA
Posts: 173
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fitting radius
I believe some of the Aeroquip fittings for the crankcase oil return line have a larger bend radius, perhaps a different part number. I think the larger radius is the cause of the interference.
Tom O.
__________________
Tom O.
RV-12, bought flying
Hoskins Field, 44T
Olympia WA
the bitterness of poor quality
lingers long after the cheap
price is forgotten.
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09-11-2016, 12:38 PM
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Join Date: Dec 2008
Location: Lacey, WA
Posts: 1,365
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No, that is a short radius ell
Quote:
Originally Posted by Harvey rv12
I believe some of the Aeroquip fittings for the crankcase oil return line have a larger bend radius, perhaps a different part number. I think the larger radius is the cause of the interference.
Tom O.
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Here is a comparison of an installed short radius ell and a standard radius ell held up next to it. The one shown in Piper J3's picture is the correct short radius. I don't think it would be even possible to install a standard radius ell in this location.
I have looked at several 12's and there is not much clearance on any of them.

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Tony
E-LSA RV-12 ULS
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09-11-2016, 05:51 PM
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Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,066
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A good day...
I dropped the muffler and then re-routed the oil return line so the fitting faces aft and the line comes around the back of the engine. I now have good clearance between the 90 degree fitting and muffler. See pic. Muffler looks a little grungy - phone camera doesn't do it justice.
I want to thank everyone for their help. I bought this airplane from the original builder and I guess I'm still sorting out some issues...

__________________
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Jim Stricker
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622 
LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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09-11-2016, 08:45 PM
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Join Date: Jan 2016
Location: santa rosa CA
Posts: 90
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The muffler on my 12 is also a little grungy. I think it just goes with being what it is.
Maybe painting it, or having it ceramic coated would clean things up, but on mine, over time, oil, coolant, drool, all has dripped onto the muffler and it gets baked on and doesn't come off.
Anyone else keep breaking safety wires and springs too? I just had to replace the safety wire on 3 of my springs.
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