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73-87 Chevy _ GMC Trucks
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Broken exhaust manifold bolts
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Topic: Broken exhaust manifold bolts (Read 11092 times)
dumbucket1
Too Many Trucks
Junior Member
Posts: 597
Coal Hauler
Broken exhaust manifold bolts
«
on:
June 16, 2008, 04:13:13 PM »
Broke 2 off on cylinder 7 flush with the head on a 305. I tried and easy out on both with lots of soaking with pb blaster and heat but broke the easy out off inside both. Then I tried grinding a bolt down to a taper and then welding that to the broken bolt but my welds dont want to hold up, probably because of the easy outs that I cannot get out now. Any other suggestions?
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Chevy and GMC trucks ranging from 1973 to 2007
ccz145a
Senior Member
Posts: 1393
Re: Broken exhaust manifold bolts
«
Reply #1 on:
June 16, 2008, 04:21:22 PM »
punch and hammer, if you can find a "landing" to drive against.
or
grind a slot for a screwdriver.
either way I would try to "shock" the threads by trying to tighten first -- then try to loosen (old millwright trick).
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1975 C10 Silverado LWB, 454CID, TH400, 10bolt 3.42
11MPG Downhill w/tailwind (but there ain't no hills here)
Bitzer!
Junior Member
Posts: 906
Smiles per gallon
Re: Broken exhaust manifold bolts
«
Reply #2 on:
June 16, 2008, 04:23:31 PM »
Grind down to a flat surface and drill them out carefully
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1979 GMC CrewCab C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*
VileZambonie
Global Moderator
Senior Member
Posts: 19034
Re: Broken exhaust manifold bolts
«
Reply #3 on:
June 16, 2008, 08:41:58 PM »
Quote from: Bitzer! on June 16, 2008, 04:23:31 PM
Grind down to a flat surface and drill them out carefully
This
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Blazin
Blazin new trails!
Global Moderator
Senior Member
Posts: 6130
Re: Broken exhaust manifold bolts
«
Reply #4 on:
June 17, 2008, 12:15:24 AM »
Might have to Heli Coil the holes after.
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Some people are like Slinkies. Not really good for anything, but they still bring a smile to your face when you push them down a flight of stairs
dumbucket1
Too Many Trucks
Junior Member
Posts: 597
Coal Hauler
Re: Broken exhaust manifold bolts
«
Reply #5 on:
June 17, 2008, 01:07:53 AM »
cant really grind on anything they are recessed down slightly
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Chevy and GMC trucks ranging from 1973 to 2007
Bitzer!
Junior Member
Posts: 906
Smiles per gallon
Re: Broken exhaust manifold bolts
«
Reply #6 on:
June 17, 2008, 11:22:54 AM »
take it out and give it to a machine shop- if they !@#$ it up they'll have to sort it
Blimey Vile- I got something right!!
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1979 GMC CrewCab C20 1t
454 750 Holley,TH350, 14bolt diff fully floating
Why aren't there 8 days in a week!
A K5 rolling shell *new addition*
VileZambonie
Global Moderator
Senior Member
Posts: 19034
Re: Broken exhaust manifold bolts
«
Reply #7 on:
June 17, 2008, 01:47:18 PM »
use a carbide burr on a dremel or die grinder to flatten it out.
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treny
Newbie
Posts: 52
Re: Broken exhaust manifold bolts
«
Reply #8 on:
June 18, 2008, 07:20:23 AM »
I have the same thing on mine and think i can drill a 5/16 hole on them and get in about 3/4 in or an inch 1/2 wouls prob do it then i will tap the holes and put 1/2 in bolts in them they will hold a heade.Also gad couple heads break off too , i just threaded them and use them for studds..Bruce
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Hii There , Stating another project , an 83 c10 2wd .Frame etc is all good and have to replace dash pad and seat , some body work and Paint Prob flat blk wth a clear cote to seal it.Ill keep in touch with updates ..Bruce
treny
Newbie
Posts: 52
Re: Broken exhaust manifold bolts
«
Reply #9 on:
June 18, 2008, 07:25:22 AM »
replacement the one above you would have to decipher that one..
I have the same thing on mine and think i can drill a 5/16 hole on them and get in about 3/4 in or an inch 1/2 would prob do it then i will tap the holes and put 1/2 in bolts in them they will hold the headers.Also had couple bolt heads break off too , i just threaded them and use them for studds..Bruce
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Hii There , Stating another project , an 83 c10 2wd .Frame etc is all good and have to replace dash pad and seat , some body work and Paint Prob flat blk wth a clear cote to seal it.Ill keep in touch with updates ..Bruce
Blue 82
Frequent Member
Posts: 281
Re: Broken exhaust manifold bolts
«
Reply #10 on:
June 18, 2008, 07:21:57 PM »
PB Blaster is good, but I think this works much better.
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82 stepside 2wd 355/th350/3.08 posi
DnStClr
Senior Member
Posts: 1809
Re: Broken exhaust manifold bolts
«
Reply #11 on:
June 19, 2008, 08:51:01 PM »
Heat is usually the key to broken bolt removal. Is enough bolt left to drill small holes around the "not so" EZ Out and work on getting the EZ OUT removed? Probably not, so you have to heat the bolt with a torch til RED and let it cool and do it again. The repeated heat works to separate the rust away from the bolt and sometimes the bolt can be removed that way. I use Kroil too. After all these methods we're hrowing at you, you'll probly end up following Bitzer's advice and removing the head and taking it to a machine shop.
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Don
87 Chevy Silverado
dumbucket1
Too Many Trucks
Junior Member
Posts: 597
Coal Hauler
Re: Broken exhaust manifold bolts
«
Reply #12 on:
June 20, 2008, 11:37:08 AM »
Ive exhausted all methods lol. I have located a set of heads for free so I think I will just use them heads.
On that note do 305's use torque to yield bolts?
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Chevy and GMC trucks ranging from 1973 to 2007
VileZambonie
Global Moderator
Senior Member
Posts: 19034
Re: Broken exhaust manifold bolts
«
Reply #13 on:
June 20, 2008, 06:19:21 PM »
No they don't.
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Senior Member
Posts: 2683
Re: Broken exhaust manifold bolts
«
Reply #14 on:
June 23, 2008, 11:59:52 PM »
When drilling out the bolt, use a left-hand drill bit and you may luck out and it'll snag and break it loose as you work on it.
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Kenny
1978 C-20, 350/400, 3.73, Graystone Metallic, Raceline Renegade 8 Wheels - 18x8.5, 275/70R18 BFG KO's
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73-87 Chevy _ GMC Trucks
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Broken exhaust manifold bolts