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  #1  
Old 09-09-2016, 03:44 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Default 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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Bought Flying RV-12 #120058 Oct 2015 with 48TT - Hobbs now 622

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  #2  
Old 09-09-2016, 03:52 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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Default

Quote:
Originally Posted by Piper J3 View Post
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?

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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  #3  
Old 09-09-2016, 05:11 PM
Harvey rv12 Harvey rv12 is online now
 
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Default

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.
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Old 09-09-2016, 07:03 PM
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rvbuilder2002 rvbuilder2002 is offline
 
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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.
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  #5  
Old 09-10-2016, 03:48 AM
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Piper J3 Piper J3 is offline
 
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Default

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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  #6  
Old 09-11-2016, 05:48 AM
BigJohn BigJohn is offline
 
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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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  #7  
Old 09-11-2016, 09:13 AM
Harvey rv12 Harvey rv12 is online now
 
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Default 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.
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  #8  
Old 09-11-2016, 12:38 PM
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Default No, that is a short radius ell

Quote:
Originally Posted by Harvey rv12 View Post
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.
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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  #9  
Old 09-11-2016, 05:51 PM
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Piper J3 Piper J3 is offline
 
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Default 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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  #10  
Old 09-11-2016, 08:45 PM
Chrysopelea Chrysopelea is offline
 
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Default

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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