Manifold bolts

[scHemi]

Well I wemt and attempted my repair of my broken exhaust manifold bolts. 2 sheered off right at head. And I can't drill them as the bit keeps walking off and drilling my head. I'm screwed. Thoughts? I didn't want to have to take the head off but now it looks like I am going to have tone and get a head from eBay and rebuild it.

Thoughts if being able to drill the bolt?

 

[jwheeler]

You need to get a good center punch. Make a nice little dimple so the bit won't walk. The key is to get that sucker started right in the middle or you will be kinda screwed. I have done a ton of these and have never replaced a head.


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[JohnD72]

If a center punch won't work or you can't get the tools into the tight space, use a dremel to bore a small dimple in the bolt to keep the bit from walking.
Dremel has pointed diamond-tip bits or etching bits that you can use for this.

 

[Dubstep Shep]

If a center punch won't work or you can't get the tools into the tight space, use a dremel to bore a small dimple in the bolt to keep the bit from walking.
Dremel has pointed diamond-tip bits or etching bits that you can use for this.

Before you do anything like taking a head off, first try to take a dremel and make a long deep cut straight across the bolt. I've done that and used a flathead screwdriver to remove stuck bolts on a few occasions.

If that doesn't work, you MAY be able to weld a small bead on the head of the bolt, then cut it for a screwdriver. If the bolt is steel and the head is aluminum (which I think is correct), you won't weld them together. I've done it a few times.

 

[scHemi]

Thanks guys. Excellent pointers. Will give those a try


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[RLJ10X]

Good luck, sc. I mean that. I'm not being sarcastic.

No way would I ever tackle a job like that. I hate exhaust nuts, bolts, studs and everything that goes with them. Every once in a while, you just have to break down and pay someone else to work on your stuff.

 

[scHemi]

Thanks guys. It sucks but oh well


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[SIhemi]

I'm dealing with one right now. I'm not tackling the job myself. It's the 2nd one in the past couple of months. I bought headers with new locking bolts this time. Tired of this happening.

 

[Tach_tech]

The way we do it at work is to weld a nut onto the broken stud, it can be tricky but we have a 100% success rate. Of course if you don't have access to a welder this will be no help to you.

 

[jwheeler]

The way we do it at work is to weld a nut onto the broken stud, it can be tricky but we have a 100% success rate. Of course if you don't have access to a welder this will be no help to you.

I have never had any problems with my left handed drill bits and extractors but this sounds like a quicker idea. Works even when they are broken flush?


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[Tach_tech]

I have never had any problems with my left handed drill bits and extractors but this sounds like a quicker idea. Works even when they are broken flush?


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Absolutely, even when they brake slightly below flush. What I'll do is actually build up some weld on the broken stud so it's a little easier to weld the nut on. Usually works the first or second time. Only time it's a real pain getting them out is when they've been broken for a long time.

 

[jwheeler]

Absolutely, even when they brake slightly below flush. What I'll do is actually build up some weld on the broken stud so it's a little easier to weld the nut on. Usually works the first or second time. Only time it's a real pain getting them out is when they've been broken for a long time.

Cool. I'll have to give it a shot.


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