Exhaust side of head stripped
Hello,
I have a 1.6l miata engine that's getting prepared for turbo and bought some better Exhaust studs. So I was cleaning the threads on the Exhaust side of the head with a thread chaser and on the very last stud hole my thread chaser somehow fouled up and got stuck, I had to back it out with force and with it the threads were gone. :facepalm: I've found this post: https://www.miataturbo.net/engine-pe...threads-81900/ and it's a fixable mistake... My question: I noticed on 1.6l heads there are two unused exhaust stud holes (pic 1) https://cimg8.ibsrv.net/gimg/www.mia...12700bcbb4.jpg I messed up the threads on the upper left part of the head (pic 2) https://cimg3.ibsrv.net/gimg/www.mia...4d2f9e7909.jpg Is it possible to set up the stud configuration like such (pic 3) https://cimg5.ibsrv.net/gimg/www.mia...873bfcbe4c.jpg to provide adequate clamping of the manifold to the head? Or do I need to repair that hole and go with how the studs were originally setup? My reasoning is , to me the configuration in (pic 3) seems symmetrical and can provide a proper seal if I tighten the nuts evenly around. I also saw this miata head (pic 4) with a similar configuration . https://cimg5.ibsrv.net/gimg/www.mia...c30ede408b.jpg Thank you for your help, Drew |
Just do a thread sert or a helicoil
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Originally Posted by sixshooter
(Post 1557526)
Just do a thread sert or a helicoil
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Does your header have provisions for that stud? I wouldn't see any reason that it wouldn't be adequate, but are there headers and gaskets that have holes for that unused hole?
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Originally Posted by acedeuce802
(Post 1557539)
Does your header have provisions for that stud? I wouldn't see any reason that it wouldn't be adequate, but are there headers and gaskets that have holes for that unused hole?
Here are two gaskets I have, one mls and other is composite. https://cimg3.ibsrv.net/gimg/www.mia...74cb921913.jpg Here is my turbo manifold. https://cimg4.ibsrv.net/gimg/www.mia...646d012289.jpg Also here is an 1.6 OEM manifold gasket set https://cimg1.ibsrv.net/gimg/www.mia...77b688f10a.jpg https://cimg4.ibsrv.net/gimg/www.mia...bd06678d57.jpg Thoughts? |
probably just fine
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Originally Posted by ryansmoneypit
(Post 1557550)
probably just fine
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Originally Posted by ryansmoneypit
(Post 1557550)
probably just fine
Originally Posted by tomrev
(Post 1557553)
Plus 2 for above; and by the way, that is a beautiful header!
https://cimg7.ibsrv.net/gimg/www.mia...2d02bbf936.jpg |
trubo not hit block. nice!
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Just use heilcoil. Stripped threads in alumnium heads is pretty common, heil coils are steel and would provide a stronger thread anyhow. Some people preemptively heil coil their stud holes for this reason.
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I much prefer the MLS gaskets over the composite ones. I only get a single use out of the composite ones as they really deform on me after the first torque.
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EZ Loks are so easy I'm happy I did this:
https://www.miataturbo.net/build-thr...4/#post1540476 |
Will the helicoil work on the turbo flange as well? Threads are boogered up on one of mine. Have used it successfully on a caliper but kind of thought the high temp would make it fail.
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I always use a keencert if room allows. King cert? I never remember the name.
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