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  #11  
Old 03-10-2021, 04:18 PM
Steve Melton's Avatar
Steve Melton Steve Melton is offline
 
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typically a commercial airliner landing over 4G should have the engine mounts inspected. I don't know the typical limits for small piston aircraft.
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  #12  
Old 03-10-2021, 07:44 PM
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Quote:
Originally Posted by RFSchaller View Post
Bummer, Jim. Are you going for a weld repair or complete replacement?
I ordered new engine mount. Part is in stock but won't ship for a week. Van's is behind because of ice storm, power outage, and COVID.
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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 650

LSRM-A Certificate 2016 for RV-12 N633CM
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
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  #13  
Old 03-12-2021, 10:41 AM
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I have a new twist on my problem… Van’s tells me today that engine mounts are not in stock and expected delivery is May 3.

So, a couple of possibilities:

Does anyone either have a spare engine mount, or perhaps building now and don’t need engine mount for a month or two and be willing to send to me for brand new engine mount I have on order?

Second choice would be to repair existing engine mount. See photo below. I can send mount to be welded and would like to use a reputable service. Any suggestions appreciated.
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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 650

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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  #14  
Old 03-14-2021, 04:58 PM
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It took two guys a total of eight hours to remove engine mount. As stated above, Van’s won’t receive mounts from their supplier until May 3.

I have located a welding shop that specializes in TIG. We will make a jig to hold 189mm vertical spacing between mounting pads per Rotax Engine Installation Manual. Crack will be chamfered with a carbide burr for good weld penetration. Tubing will be preheated to around 800F, TIG welded, and cooled slowly. A Chromoly 4130 split over-sleave will be welded in place to complete the repair. Lucky thing (if you want to call it that) the crack is in the straight upper tube and not the curved lower tube. I will find somebody locally to strip and powder-coat.

Brilliant white color is good for showing cracks, as I’m finding out first hand…
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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 650

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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  #15  
Old 03-14-2021, 05:22 PM
seagull seagull is offline
 
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Jim, can you share some pics of the crack close up and distant showing the relationship to the overall mount.
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  #16  
Old 03-14-2021, 06:46 PM
NinerBikes NinerBikes is offline
 
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Will you be putting in all new rubber bushings while you're in there, to remove any sag?
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  #17  
Old 03-14-2021, 06:49 PM
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Now that the mount is no longer bolted to the engine the crack has closed up and vertical spacing between mounting pads is less than 189mm. When we jig the mount for 189MM vertical spacing between mounting pads the crack will separate just like when it was bolted to the engine. So, when welded, the mounting pads will line up with the engine bolt holes.
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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 650

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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  #18  
Old 03-14-2021, 08:21 PM
seagull seagull is offline
 
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Is this the correct location?


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  #19  
Old 03-14-2021, 09:47 PM
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Quote:
Originally Posted by Piper J3 View Post
Now that the mount is no longer bolted to the engine the crack has closed up and vertical spacing between mounting pads is less than 189mm. When we jig the mount for 189MM vertical spacing between mounting pads the crack will separate just like when it was bolted to the engine. So, when welded, the mounting pads will line up with the engine bolt holes.
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Man, that looks to be completely broken.. Is there still part of the tube on the other side not broken, or is it a clean break? I only have 189 on the Hobbs meter and don’t see any breaks in mine yet, but you definitely made me decide to pull the cowling and check last night. Thanks for the info.. I see another SB coming out soon... Wonder how much a new and improved engine mount is going to cost? $$$$...
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  #20  
Old 03-15-2021, 03:18 AM
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Quote:
Originally Posted by seagull View Post
Is this the correct location?
Yes. Lower left (pilot side) engine mounting bolt.
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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 650

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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