06-05-2021, 04:53 PM | #1 |
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Join Date: Feb 2021
Location: Columbia, SC
Posts: 15
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Rough Day
While having a new radiator made, I decide to clean up the motor and repaint a few parts. I pulled the exhaust manifold off, clean and repainted,etc. I then reinstalled the exhaust manifold. I reinstalled the exhaust manifold with new gasket. While torquing the nuts to the manifold studs, I torque each nut evenly up to 30 ft pounds, then 35, then 40. I was going to stop at 40 but said, “no I’ll follow the Red Book” and torque each to 45 foot pounds. I then torque the 1st nut, 2nd nut, 3rd nut....then I as I torque the 4th nut from 40 to 45, I hear a metallic “snap”. I broke the 4th stud. I almost cried and then immediately cracked a beer.
Anyone ever been in this pickle? Help! Thanks, Brent |
06-05-2021, 04:57 PM | #2 |
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Join Date: Nov 2018
Location: Farmington MI
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Re: Rough Day
Not too bad, just a stud... I was holding my breath ... waiting for "cracked off the manifold ear" that's bad
Joe B |
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06-05-2021, 05:22 PM | #3 |
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Join Date: Feb 2021
Location: Columbia, SC
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Re: Rough Day
Just use a “bolt extractor” and replace? I have this fear that the stud in the engine won’t come out and/or a torch is needed. Gulp.
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06-05-2021, 05:37 PM | #4 |
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Location: So Cal
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Re: Rough Day
That is one of the mistakes in the red book, should be around 25-30.
Another mistake in the pan bolts no way 20 ft lb. |
06-05-2021, 06:04 PM | #5 |
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Location: Lincoln, Nebraska
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Re: Rough Day
Glad it was just a stud.
Drilling and using an extractor can work but if you break the extractor off in the stud then things get very troublesome. I would suggest that you take the car to someone that can weld a nut onto the stud and back it out that way. I never use a torque wrench on a manifold. I just snug them up a little at a time until I feel most of the "squish" is out of the gasket. I check them a few times after driving until they settle in. They don't have to be super tight if your surfaces are reasonably flat and are using a new gasket. When installing I leave the two bolts holding the intake manifold to the exhaust manifold loose and tighten them last.
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Dave / Lincoln Nebraska |
06-05-2021, 11:36 PM | #6 | |
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Re: Rough Day
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Quote:
Not the end of the world at all. I have snapped a several bolts over the years on different cars and I have always been able to get them out with an extractor tool that you can get at Lowes or stores like that. As for the beer its never a bad idea after an O Sh!& moment. Best to walk away and get a plan together. Ron |
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06-06-2021, 09:21 AM | #7 |
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Location: Washington Cty., ME or Flagler Cty., FL
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Re: Rough Day
Brent, I had the same experience with a cylinder head stud on a newly rebuilt engine. I wanted to paint the cylinder head myself and have the copper gasket exposed. Dumb, I should have let the rebuilder do the job. A friend helped me get the bad stud out of the block. Ed
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06-06-2021, 05:32 PM | #8 |
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Location: west coast Fla..
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Re: Rough Day
I torque the manifold to 30 lbs and performs well, no leaks....
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06-06-2021, 05:55 PM | #9 |
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Join Date: Apr 2021
Location: Central Illinois
Posts: 469
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Re: Rough Day
Well, I took the 25 foot/lb. advice. But I put a dab of aluminum never sieze on the studs. Uh oh ... then I remembered the torque page in the red book. A 40+ percent reduction in torque is advised when using anti seize. I stopped tightening. So far so good.
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"It ain't what you know for certain that gets ya in trouble. It's what ya know for certain that just ain't so!" |
06-06-2021, 08:09 PM | #10 |
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Join Date: Dec 2014
Location: Shawnee, Ok
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Re: Rough Day
Depending on how much stud you have left, I'd use the tool below (about $18) along with some PB blaster, a lite ballpeen hammer
IT may not be as bad as you imagine,
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Keith Shawnee OK '31 SW 160-B |
06-06-2021, 08:17 PM | #11 |
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Join Date: Jun 2013
Location: Western Springs, IL
Posts: 323
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Re: Rough Day
If you need to drill it out at all, use a left hand drill bit, run of course in your drill backwards. Sometimes you can get the bit to bite into the stud and reverse it without further work.
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