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Old 02-17-2018, 12:13 AM   #1
Srjs28
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Default Tricks for exhaust manifold bolts

Replacing the motor on my 05 vue. I just canít seem to break loose the exhaust manifold bolts Iíve tried impacts, heat, several socket sizes to avoid stripping, soaked with kroil and pb blaster and hammering on them.
Any tips or tricks you guys have up your sleeve?

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Old 02-17-2018, 01:15 AM   #2
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Default Re: Tricks for exhaust manifold bolts

Also soaked in ATF and Acetone

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Old 02-17-2018, 01:18 AM   #3
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Default Re: Tricks for exhaust manifold bolts

These are the 3 flange bolts by the way

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Old 02-17-2018, 08:15 AM   #4
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Default Re: Tricks for exhaust manifold bolts

[QUOTE=Srjs28;2265888 Iíve tried heat,[/QUOTE]

I haven't tried to loosen those specific bolts, but a good soaking of penetrating oil and RED HOT heat applied to the flange has always worked for me. Work quickly, after 10 or 14 seconds, if it becomes hard to turn, you will have to heat it up again. Reverse motion, like you are cutting new threads, also helps.

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Old 02-17-2018, 08:23 AM   #5
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Default Re: Tricks for exhaust manifold bolts

Will a propane torch be hot enough?

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Old 02-17-2018, 04:36 PM   #6
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Default Re: Tricks for exhaust manifold bolts

I've never had any luck using propane for heating bolts...Mapp gas gets a little hotter but acetylene is the way to go if you can. Whatever you use needs to be hot enough to actually get the metal red hot....or very close to it.

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Old 02-17-2018, 05:35 PM   #7
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Default Re: Tricks for exhaust manifold bolts

Quote:
Originally Posted by Srjs28 View Post
Replacing the motor on my 05 vue. I just canít seem to break loose the exhaust manifold bolts Iíve tried impacts,
Wow! an impact will not break it loose?

Try this: Tighten the bolt then try to break it loose. Seems counter intuitive but many times this will work.

...
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Old 02-17-2018, 06:07 PM   #8
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Default Re: Tricks for exhaust manifold bolts

Well I got one out. The other 2 are stripped. Supposed to be 14mm but the rust turned it into something other than any tool I have

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Old 02-17-2018, 07:06 PM   #9
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Default Re: Tricks for exhaust manifold bolts

If you are pulling the engine out anyway you might think about just cutting the nuts and studs off at the flange. When you get the engine removed, and the manifold removed from the engine, just cut the remaining stud off and drill and tap a new hole. That is what I did. It is much easier to deal with it out of the car. Just a word of caution, the manifold studs are prone to breaking. Be very cautious when you try to remove the nuts. Spray them liberally with Blaster and let them sit at least overnight. If you break a stud they usually break right at the head.

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Old 02-18-2018, 06:22 AM   #10
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Default Re: Tricks for exhaust manifold bolts

Using my cut off wheel makes me leery around all the raw fuel and gas lines since they are disconnected from the fuel rail

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Old 02-18-2018, 08:50 AM   #11
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Default Re: Tricks for exhaust manifold bolts

I feel your pain!! Irwin makes a bolt/nut extractor socket set that you can pick up at a Lowes store. I hope there is enough clearance to get one on the nut. Other than that an air chisel to break the nut or a nut splitter are options. Good luck and let us know how you succeed.

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Old 02-18-2018, 01:20 PM   #12
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Default Re: Tricks for exhaust manifold bolts

A trick I have seen is to get them real hot and then put a Crayon against the shank and the wax will run down into the threads. Seen a shop doing this on a Motorhome. Worked for them and colour of crayon doesn't matter.. lol

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Old 02-18-2018, 02:05 PM   #13
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Default Re: Tricks for exhaust manifold bolts

Thanks guys. I had to cut them off with a cutoff wheel. It was tough getting clearance but I managed.
Man there is a lot of work to do to pull this motor

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Old 02-18-2018, 04:07 PM   #14
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Default Re: Tricks for exhaust manifold bolts

Quote:
Originally Posted by GMDad View Post
A trick I have seen is to get them real hot and then put a Crayon against the shank and the wax will run down into the threads. Seen a shop doing this on a Motorhome. Worked for them and colour of crayon doesn't matter.. lol
That's a good technique. I forgot about it or I would have mentioned it.

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Old 02-19-2018, 10:41 PM   #15
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Default Re: Tricks for exhaust manifold bolts

I was going to second the crayon/wax idea. I've heard of it before. Otherwise I heat and spray with whatever pent rating oil I have. Then heat and repeat several times. Use the expanding and contracting to draw in the lubricant. I've also been in the position of just drilling out the broken bolt.
Any exhaust fasteners on my vehicles get replaced with stainless. Never a problem again.

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