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  #11  
Old 03-14-2021, 04:58 PM
Piper J3's Avatar
Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
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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 670

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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  #12  
Old 03-14-2021, 05:22 PM
seagull seagull is offline
 
Join Date: Dec 2019
Location: San Bernardino
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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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  #13  
Old 03-14-2021, 06:46 PM
NinerBikes NinerBikes is offline
 
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Location: Granada Hills
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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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  #14  
Old 03-14-2021, 06:49 PM
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Piper J3 Piper J3 is offline
 
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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 670

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, 08:21 PM
seagull seagull is offline
 
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Is this the correct location?


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  #16  
Old 03-14-2021, 09:47 PM
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jrock836 jrock836 is offline
 
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Location: Burleson, Texas
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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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Last edited by jrock836 : 03-14-2021 at 09:54 PM.
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  #17  
Old 03-15-2021, 03:18 AM
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Piper J3 Piper J3 is offline
 
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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 670

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 03-15-2021, 07:22 PM
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Crafting N112DR Crafting N112DR is offline
 
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Default It smells really bad!

Oh No!!, I smell another SB in the Wind and it smells really bad.
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  #19  
Old 03-15-2021, 07:26 PM
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Piper J3 Piper J3 is offline
 
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Quote:
Originally Posted by NinerBikes View Post
Will you be putting in all new rubber bushings while you're in there, to remove any sag?
Yes, new rubber bushings and all new High Performance Silicone Heater Hoses.
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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 670

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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  #20  
Old 03-15-2021, 08:57 PM
RFSchaller RFSchaller is offline
 
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Bite your tongue, David!��
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