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#1 |
Registered User
Join Date: Jun 2012
Location: 30 miles east of nowhere
Posts: 70
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Broken bolt in 292 engine block?
I was replacing my water pump in my 69 GMC and as I was in screwing the bottom driver side bolt the head broke off. Since then I am in the process of drilling it out and re tapping the threads. I'm 15 and thievish my first restoration so I have no idea how to finish drilling it out and re tapping the threads. So I figured I would ask the guys that know what they're doing. The bolt is almost drilled out completely but I just need to get one size bigger. Thanks for the help!!! -Sam
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#2 |
the boat guy
Join Date: Jul 2007
Location: springfield mo
Posts: 2,339
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Re: Broken bolt in 292 engine block?
Ouch, I would have welded a nut to it, the heat really helps the stud/broken bolt come out.
If you've already ruined the existing threads in the block get the next size larger tap and the right drill bit. If you haven't already ruined the threads in the block, carefully remove what's left of the bolt/stud and clean the threads with that size tap. Posted via Mobile Device
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67, swb, fleet, tach, throttle, 5.3, 4l60e, 3.73's, fuel cell, 5 lug, p.d.b., 4-6 drop. great little truck 66, stevens drag/ski 18' silouette, 350, 2.02 doublehump heads. comp extreme marine 278 cam, vette 7 fin valve covers, old polished edelbrock intake, velvetdrive, casale v-drive, adj cavitation plate. 28, model a rpu project, |
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#3 |
Registered User
Join Date: Jun 2012
Location: 30 miles east of nowhere
Posts: 70
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Re: Broken bolt in 292 engine block?
I haven't completely ruined the threats yet. Thanks for the help! Does anyone know where I can get a welder under 200 bucks? If this happens to me again I will just weld a nut to it like brad suggested. Thanks!
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#4 |
Registered User
Join Date: Dec 2004
Location: Arvada Colorado
Posts: 1,321
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Re: Broken bolt in 292 engine block?
Maybe you can use a helicoil. I have had great luck with them.
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Larry 1949 Willys CJ2A, Kubota Turbo Diesel engine, Warn Overdrive, 11 inch brakes, 12volt, Warn M8000 Winch "Little Green" 1970 Rustoleum Roller Red C20 Custom Camper 454 TH400 "Big Red" 1971 K20 6.2 Turbo Diesel 4x4 4spd Ranger Overdrive "Pumpkin Wagon" 2005 VW Beetle Diesel 44+ MPG "Silver Bullet" |
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#5 |
Registered User
Join Date: Nov 2010
Location: Las Vegas, Nevada
Posts: 160
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Re: Broken bolt in 292 engine block?
Heli-Coils kick rear! They are a great repair and you get to keep the same diameter bolt after drilling to a bigger size. Drill to the specified size and then use the tap in the kit and install the insert. Done. Next time, try welding a nut to the stud/ bolt and it will usually will come right out. Just work it back and forth until it gets looser and looser. Sometimes if you get all gung-ho and just try twisting it out and it is stuck, it might break again.
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T.Y.N Custom Works..... Because "Stock" Sucks! 1971 K 10 GMC Long Bed 1977 Formula T/A Frame off Resto-Mod ![]() 1995 FXDL Harley Low Rider 1985 C10 ShortWide 91 Burb front. |
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#6 | |
Senior Member
![]() Join Date: Nov 2011
Location: Yuma, AZ
Posts: 319
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Re: Broken bolt in 292 engine block?
Quote:
http://www.harborfreight.com/90-amp-...ODQ5NCJ9%0D%0A, but if you can wait and save up a little more cash here is a link to the one eastwood sells with a little more function with out too much cost. http://www.eastwood.com/mig-welder-1...5a-output.html Welcome to the board and if you can post pictures always helps too.
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65 C-10 Times gone by(Sons truck)http://67-72chevytrucks.com/vboard/s...92#post6164692 70 C-30 Tow truck AKA Highlighter 02 Silverado 2500 HD CUCVII Tow Rig/DD 1968 C10 Project Quarantine http://67-72chevytrucks.com/vboard/s...d.php?t=804800 1980 Buick Regal Dirt Stock car |
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#7 |
Registered User
Join Date: May 2009
Location: Goldsboro NC
Posts: 151
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Re: Broken bolt in 292 engine block?
I would STRONGLY recommend you try welding a nut to it FIRST!
Since you are unfamiliar with drilling/tapping/heli-coils I would use that if welding a nut fails. I have fixed many ford heads (sorry) that have broken intake bolts near cyl #1 by welding a nut to the broken bolt. IT WORKS!! Usually the corrosion of seeping coolant is the culprit on water pump bolts. A little heat (from welding a nut) will "cook" this corrosion off and it will spin right out. Just wait for the welded nut to cool down before putting a wrench on it otherwise it just may break off. Maybe look on craigslist to find somebody with a mobile welder setup. It would be money well spent! |
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#8 |
Registered User
Join Date: Mar 2011
Location: Brandon,Iowa
Posts: 391
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Re: Broken bolt in 292 engine block?
I used to weld nuts to broken bolts but a friend of mine showed me a trick that has worked out quite well. Weld a flat washer on the bolt first. With a nut you have to weld inside of the nut,,, not a lot of room. Weld a flat washer on then set a nut on top of the washer. You can weld the outside of the nut and the inside as well. This has worked very well for me.
Have a great day !! Tom |
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#9 |
Registered User
Join Date: Nov 2012
Location: Spanish Fork Ut
Posts: 370
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Re: Broken bolt in 292 engine block?
Drill bits and an easy out kit works wonders also. No welding required lol
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" Dead Pumpkin" 67 Chevy short bed, 292 I6, 4spd manual. Fan of the "Slant Noses". ![]() 93' Toyota pickup 2WD 2dr and 32mpg. Daily driver. 300k+ Members I've met... Mister-B |
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