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Stripped out exhaust studs
Does anyone know of a O-320 exhaust stud drill fixture for drilling out, or more importantly drilling for helicoil repair?
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Re: Stripped out exhaust studs
Bobby,
is the stud stripped or the hole in the cylinder ? Good place for a photo.
This is one of the places I like to ask how handy are you. Have you drilled a lot of holes in steel and Alumanum? Have you installed anhelocoil in somthing else before? If you have then fine, if not best to seek out someone who has, could save you a lot of money and time.
There is a tool floating around. I've never used one, I just drill the hole but for the less experienced it's not a bad idea. Also I've made a tool to,do round moter studs back in the day with a thick plate of steel. Ha, I've been around long enough to say back in the day!
some one will most surly chime in about that tool soon.
Rocket
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Re: Stripped out exhaust studs
I made a fixture that bolts up to the good stud so yo can drill out the stripped one straight. It’s just a a straight piece of steel with two holes in it. I’ll locate it and take a picture of it. If you can use it I’ll send it to you. Back in the day when I was having to pull the exhaust every 100 hours, which was almost twice a year, wallowed out exhaust studs were a continuing problem. I haven’t used it recently.
Not sure it would be helpful if the stud is broken off in the cylinder.
Last edited by Gilbert Pierce; 05-25-2020 at 08:24 PM.
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Re: Stripped out exhaust studs
Thanks for the reply, I have drilled out a lot of holes and done Helicon in other applications, but I am still not the best at it. My experience has been with heavy structure on the A-10s. When would repair a hole like this we typically used a guide and a reamer to prep the hole, mostly installing SS or Inconel bushings. This stud is stripe out of the hole in the cylinder and needs to be drilled and taped for a repair coil. I know a few people like yourself that can eyeball a hole and drill it straight, but i am not one of them, LOL . Thanks for the info.
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Re: Stripped out exhaust studs
Yes, would love to barrow that tool if you can find it. I think I need to barrow or fabricate a fixture and I am also think a piloted 21/64 reamer would be very helpful.
Thanks you
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Re: Stripped out exhaust studs
There are lots of videos on youtube showing how to install helicoils.
Some are very basic (https://www.youtube.com/watch?v=bp31p8jSWaM) and some go into details of the presenter's life story.
This one is a pretty good demonstration, starting about 2:25. https://www.youtube.com/watch?v=46bIm2xaLuc
GG
Last edited by Glen Geller; 05-26-2020 at 12:08 PM.
Glen Geller
1955 PA22-150 "One For Papa!"
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Re: Stripped out exhaust studs
Great info!! My plan now is that I am going to prep the hole with a .3281 X .3125, piloted reamer with a 5/8 length pilot and a follow on ream with a .3281 bottom reamer, both using Boelube. Then tape and install the helicoil. If the 5/8 pilot on the first ream won't hold it straight, I will fab a drill guide fixture like yours. What do you think? does that sound OK?
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Re: Stripped out exhaust studs
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Re: Stripped out exhaust studs
What lock tight is recommended for Helicoils?
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