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  #1  
Old 12-30-2022, 07:08 PM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
Posts: 712
Default EX-00024 versus EX-00024 REPLACEMENT

For the Rotax 912iS builders, please check the tension of your #4 cylinder exhaust springs (aft left side). We found an exhaust leak at conditional and when removing the pipe, realized there was hardly any tension on the springs. After communicating with Van’s, it sure appears that our EX-00024 was manufactured or designed incorrectly. The only part available to purchase now is EX-00024 REPLACEMENT so there’s something going on here. Anyway, recommend iS fliers make sure the springs are stretched to provide appropriate tension and the attachments are in the correct position. Fly safe! -Jim
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  #2  
Old 12-31-2022, 02:48 AM
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Piper J3 Piper J3 is offline
 
Join Date: Nov 2014
Location: Hinckley, Ohio
Posts: 2,856
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With a little care, you can bend the tabs on both the exhaust stacks and the muffler to allow additional spring tension. I used an adjustable (Crescent) wrench to bend the tabs. This also allows the springs to be spaced further away from the hot exhaust tubing…
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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 830

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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  #3  
Old 12-31-2022, 03:45 PM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
Posts: 712
Default

Thx, the tabs won’t bend that far.

Curious how much gap your cyl #4 springs have, can’t tell from the picture. Ours pretty much had little to no tension. Actually removed the springs by hand with little effort…so they are definitely wrong.

I’ll take some more pics once assembled.
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  #4  
Old 01-01-2023, 01:30 PM
thiggins thiggins is offline
 
Join Date: Mar 2020
Location: Saluda,NC
Posts: 196
Default Try a torch

Why not try heating the tabs with a torch, then bending them…?
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  #5  
Old 01-01-2023, 02:03 PM
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Piper J3 Piper J3 is offline
 
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Location: Hinckley, Ohio
Posts: 2,856
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The loop on the tabs bend very easily. The tabs are very soft and you can bend them as far as you like. Just be careful not to upset the welds...
__________________
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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 830

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 01-05-2023, 11:27 AM
fehdxl fehdxl is offline
 
Join Date: Mar 2005
Location: Bellevue, NE
Posts: 712
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Spoke with Sterling at Van’s… guess there’s a lot of variability in welding those tabs…. bottom line is 2-3/8” from center of tab to center of tab…make that happen for the correct spring tension.
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