Helicoil exhaust port bolt hole

Discussion of the Aerovee kit engine.

Helicoil exhaust port bolt hole

Postby Bryan Cotton » Wed Aug 31, 2022 11:43 pm

Hey guys,
I was trying to put my exhaust back on and one bolt wouldn't screw in nicely. I'll try and clean it up tomorrow but the Force tells me I may end up with a helicoil here. Anybody else been through this?
buggered exhaust hole.jpg
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
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Bryan Cotton
 
Posts: 5034
Joined: Mon Jul 01, 2013 9:54 pm
Location: C77

Re: Helicoil exhaust port bolt hole

Postby T41pilot » Thu Sep 01, 2022 7:08 am

Definitely go with the Helicoil. I tried to clean mine up when that happened and it didn't hold up. I bought a Helicoil kit on Amazon that included the coils, tool and proper size drill bit. The install was easy. What a difference! The connection felt much more solid and I felt I could snug it down a bit tighter than before. I was tempted to do the rest right then and there but didn't want to take my exhaust loose since it was difficult to get on in the first place. I don't remember the size off the top of my head right now. I'm sure someone will chime in with their opinion as well but my vote is for Helicoil.
Gregg Kaat
Sonex B #0014
T41pilot
 
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Location: Howard City, Michigan

Re: Helicoil exhaust port bolt hole

Postby Bryan Cotton » Thu Sep 01, 2022 8:50 am

Thanks Gregg! They are M8x1.25. I already have the kit as Adam stripped one of the fuel pump blockoff plate holes years ago.
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
User avatar
Bryan Cotton
 
Posts: 5034
Joined: Mon Jul 01, 2013 9:54 pm
Location: C77

Re: Helicoil exhaust port bolt hole

Postby Bryan Cotton » Thu Sep 01, 2022 2:27 pm

It's always sad when you have to take off the baffles, especially with all that nice cured RTV to deal with. That stripped hole is now helicoiled and I resisted the temptation to do the other 3 (or 7 if you prefer).
helicoil exhaust hole.jpg


helicoil installed.jpg


I used primer on the helicoil and red loctite in the hole.
Bryan Cotton
Poplar Grove, IL C77
Waiex 191 N191YX
Taildragger, Aerovee, acro ailerons
dual sticks with sport trainer controls
Prebuilt spars and machined angle kit
Year 2 flying and approaching 200 hours December 23
User avatar
Bryan Cotton
 
Posts: 5034
Joined: Mon Jul 01, 2013 9:54 pm
Location: C77


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