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General Category >> Rubber Side Down! >> Help! Stuck exhaust manifold bolt!
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Message started by cheapnewb24 on 03/29/16 at 14:50:16

Title: Help! Stuck exhaust manifold bolt!
Post by cheapnewb24 on 03/29/16 at 14:50:16

The exhaust manifold is loose. Some idiot stuck an ugly, rust-prone allen bolt in the exhaust manifold. It is stuck in the head. I have sprayed PB Blaster on it, but it still hasn't budged. I assume it is 6mm, but I had to drive a 1/4" into it after the 6 slipped. When I try it, I can see the bolt flex, but not move. Not good! I'll never be able to remove the manifold or tighten it or anything unless I get this fixed, but if I break that bolt in the head, I will have a real headache. :( >:(

Title: Re: Help! Stuck exhaust manifold bolt!
Post by justin_o_guy2 on 03/29/16 at 15:17:46

Yes you'll have one HEKKUVA headache.

50/50 transmission fluid and acetone is the best penetrating oil I know of.

Get some, mix some , apply some.

Ride, put an ice cube on the bolt.

Apply.
Ride.
Ice
.
Rinse and repeat

Then, put the allen wrench in. Put a socket on an extension.
Put it on the allen wrench.

LIGHT hammer,, if it's a f at wrench,nothing heavy. Just Work back and forth, it winks, add penetrating oil, ride, cool bolt.

Hassle getting it out in one piece beats fixing it after you twisted it off.

Title: Re: Help! Stuck exhaust manifold bolt!
Post by cheapnewb24 on 03/29/16 at 15:35:10

Well, Dad gave it a try and made it worse. He slipped the 1/4 allen wrench. Now I'll have to try again with something bigger I guess. I can't even get a pipe wrench to work. For now I'm just going to put the other bolt back in and ride while I still can!

Title: Re: Help! Stuck exhaust manifold bolt!
Post by justin_o_guy2 on 03/29/16 at 21:05:38

Takes TIME to do it. Read,

Title: Re: Help! Stuck exhaust manifold bolt!
Post by gizzo on 03/29/16 at 23:02:24

What he said ^
Really, don't lay into it with the pipe wrench just yet. If it snaps before it lets go, chances are better than even it will snap level with the hole and you'll have nothing to grip. Then it gets more difficult. Use JoG's penetrating fluid. Give it time. there's no hurry. If it comes to it, you could cut the bolt head off with a grinder, remove the header, heat the area around the bolt with a little propane torch and work at it with the small pipe wrench or big vise grips. Could do it with the bolt head still attached and the header on but there might be more room to move with it off. Take it easy. It'll come out. You'll be fine. New bolt, use coppaslip or something putting it back.