460 Exhaust Manifold Bolt Broken

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460 Exhaust Manifold Bolt Broken

Home > Discussion Forum > Mechanic's Corner - Engines

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All Messages in Thread	Author	Date
460 Exhaust Manifold Bolt Broken	oldsmoboat	8-3-03
I heard an exhaust leak today and found a broken manifold bolt. It is located in the right rear of the motor in my class c. It looks fairly easy to get to but how do I get it out? Thanks.
Re: 460 Exhaust Manifold Bolt Broken	wrench	8-3-03
I would be surprise you can take it out, dealer charge around 4K because they pull the head out and drill the stud out & install a heli-coil. It can be done with an 90 degre angle bolted to the end of the cylinder head to keep the manifold again the head after the gasket been replace. wrench
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Re: 460 Exhaust Manifold Bolt Broken	Walt	8-4-03
I read somewhere that they can be burned out with a acetylene torch by a good man since the metal of the bolt burns at a different heat than the iron of the block. Suggest you talk to a few weld shops and see what they have to say. My manifold (460) warped and a mechanic used individual one port gaskets to eventually quiet the thing down by inserting them where needed to close the gaps. Hope this helps.
Re: 460 Exhaust Manifold Bolt Broken	Sam Watson	8-4-03
In the philosophy that "an aspirin is preferable to an operation", I'd back off the other manifold bolts a bit---not much--- so that you can get a small gap near the broken-off bolt, and then work some muffler patch cement into the gap and then retighten all the bolts, let the patch cement set according to mfgrs. directions. We used to use a product called "Holt's Gun Gum"---maybe it could patch a firearm-- way back when the old ChryCo 225 straight sixes were cracking manifolds as fast as you'd replace them. ChryCo told us they were working on an improved design, but until they started making them, we'd patch the cracks in the old ones as fast as they developed---never had a patch fail.
Re: 460 Exhaust Manifold Bolt Broken	Gary CC NV	8-4-03
Broken bolts at our shop are our specialty, especially working on Caterpillars, with them using so much Japanese steel now days. First thing you need to do is get a good un-obstructed shot at, like removing the exhaust manifold. DOT 3 Brake Fluid works Very well at de-solving Rust, but you can use any other kind of penetrant you prefer. Next, invest in a Left Handed Drill Bit, 9 times out of 10, that alone will remove the broken stud while you are drilling it out. If it doesn't come out, the next thing you will need is an Easy Out, just screw that into the hole you drilled, turn it to the left, as in un-screwing it, wa-la. Another thing you can do, if you know a good Director of Fabrication, also know as a Welder, is weld a nut in the center directly to the broken stud, one of the same size, that would screw on to a stud you are trying to remove, during the welding process the heat from welding the nut to the broken stud helps loosen the stud at the same time, but wait till it cool's some, and simply unscrew the broken stud out, Wa-La Again. These are all trade secrets, and they all work very well, with a Little Luck of course. The only Trick is, getting that Good Clear, Straight Shot at the broken stud, and taking your time. And use a Good Center punch, get the ceter punch hole as close to the center of the broken stud as possible. Hope this helps. Good luck.
Re: 460 Exhaust Manifold Bolt Broken	oldsmoboat	8-5-03
Thanks for the input. I am going to take the easy, albeit expensive, way out. I am having the Banks PowerPack system installed. It ought to help some while pulling my boat.