stripped exhaust manifold stud?
#1
stripped exhaust manifold stud?
So tightening up the exhaust manifold studs after repairing my head gasket the nut moves onto the stud the stud does not turn but the nut moves closer to the head but it doesnt get tighter.
I think the stud is pulling out of the head somehow! I was using a torque wrench set to the recommended 34 ft/lb
Anyone know the size of these?
Can I drill out the old threads and use the next size larger stud?
I think the stud is pulling out of the head somehow! I was using a torque wrench set to the recommended 34 ft/lb
Anyone know the size of these?
Can I drill out the old threads and use the next size larger stud?
#5
https://www.miataturbo.net/engine-pe...threads-81900/
Doesn't give much information beyond either using helicoil or timesert.
Can't do timesert way to expensive. A kit to fix my one stripped exhaust stud would be about $90 the actual insert is like $3 but you have to buy the special drill tap installion tool tap guide and all this other gubbins.
I think I will do helicoil.
Should I just go up to a M12x 1.25?
#6
I'd stay with the original stud size. The size is fine, plenty strong. If you drill and tap for the larger stud, you'll still have a steel stud engaging aluminum threads and you may have to enlarge the bolt holes in your exhaust gasket and manifold. Hassle. Once you've put in the Heli-Coil, your steel stud will be engaging stainless steel threads -- no more issues.
#7
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Do not go up a size. It may lead to unintended consequences. If there was a need for a larger size, it would have been there in the first place. Us designers don't (usually) just pick fasteners at random.
Besides, a decent helicoil (done properly) will be stronger than the original threads anyway.
Besides, a decent helicoil (done properly) will be stronger than the original threads anyway.
#8
Do not go up a size. It may lead to unintended consequences. If there was a need for a larger size, it would have been there in the first place. Us designers don't (usually) just pick fasteners at random.
Besides, a decent helicoil (done properly) will be stronger than the original threads anyway.
Besides, a decent helicoil (done properly) will be stronger than the original threads anyway.
The stock size is M10x1.25 correct? It seems a hard to find size.
#10
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I helicoiled one of mine and it is holding up fine.
Last header swap I discovered another one was stripped so I will repeat the process without hesitation. Borrow the tools if you can. That's what I did.
Note: the ones close to the firewall are a bitch. I could barely get the one I did straight with electric drill. A 90 degree air drill would have probably helped for clearance.
Last header swap I discovered another one was stripped so I will repeat the process without hesitation. Borrow the tools if you can. That's what I did.
Note: the ones close to the firewall are a bitch. I could barely get the one I did straight with electric drill. A 90 degree air drill would have probably helped for clearance.
#17
you do need special tools. the insert needs to be expanded into the drilled hole which requires a specialized tool. also needs to be counter bored which also requires a special tool. unless you guys are talking about ez lok above. which are held in with loctite and you have to drill out to 9/16" for the proper size ez lok insert. the whole deal with these is yes you can install them with a scredriver but to make it cheaper they use standard size taps in this case 9/16".
why exactly do helicoils suck?
also I should add I bought everything I need for $22. drill bit tap coil threading tool installation tool and coils. heck of a lot better than $80 for insert.
why exactly do helicoils suck?
also I should add I bought everything I need for $22. drill bit tap coil threading tool installation tool and coils. heck of a lot better than $80 for insert.
#19
dont know how I missed you guys were talking about keenserts. those still need to be drilled out quite a lot. the thin wall ones to m14x1.5 and if you like me dont have a tap set already a tap needs to be purchased. according to a test I saw on a 1/4" bolt those are stronger of course its a larger thread a keensert needs to be threaded into. and they seem a little easier to install.
I chose helicoil because I didnt want to have to drill out a big hole in the head and if the helicoil fails I can still do a insert.
I chose helicoil because I didnt want to have to drill out a big hole in the head and if the helicoil fails I can still do a insert.
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