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08-26-2017, 10:38 PM
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#1 |
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Registered User
Join Date: Jul 2017
Location: Pasadena, CA
Posts: 44
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Alternator bolt broken off in head
Well guys, this happened. I blame the cheap chrome alternator bracket on putting too much downwards pressure on the alternator.
Anyways, it's broken off well below the surface. I would normally weld a nut onto it but it's sunk in 1/8-3/16". I have had terrible luck with easy outs, do you all have any other ideas? Thanks! |
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08-26-2017, 11:02 PM
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#2 |
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60-66 Nut
  Join Date: Mar 2007
Location: Coeur d'Alene, Idaho
Posts: 23,246
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Re: Alternator bolt broken off in head
If you have a wirefeed, I would build up the end of the bolt using multiple 'tacks' until you build it up enough to be able to weld a nut onto it. Otherwise, you will likely just have to drill it out. Start with say a 3/16" bit and work your way up until all you have left is the threads and then pick them out and run a tap in the hole. I know easier said than done.
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Power Steering Box Adapter Plates For Sale HERE Power Brake Booster Adapter Brackets For Sale '63-'66 HERE and '67-'72 HERE and '60-'62 HERE and "60-'62 with clutch HERE Rear Disc Brake Brackets For Sale. Impala SS calipers HERE Camaro Calipers HERE D52 Calipers HERE 6 Lug HERE Hydroboost Mounting Plates HERE |
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08-26-2017, 11:13 PM
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#3 |
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Post Whore
 
Join Date: May 2015
Location: Alabama
Posts: 14,582
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Re: Alternator bolt broken off in head
drill and ease out...I know...it sucks....
if you try to drill the bolt out make sure your centered and straight on the broke bolt or your likely to cause more damage |
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08-26-2017, 11:32 PM
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#4 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,794
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Re: Alternator bolt broken off in head
I'm with CaptainFab. When I have a bolt broken off below the surface I'll drill out a nut of the same diameter as the bolt to about a 16th of an inch from the other side and hold it against the surface as a guide for my wife feed. It lets me build up the weld on the bolt without having to worry so much about hitting the sides of the opening.
Looking at your pic I'm pretty confident that it would work for you.
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I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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08-26-2017, 11:38 PM
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#5 |
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Registered User
Join Date: Jul 2017
Location: Pasadena, CA
Posts: 44
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Re: Alternator bolt broken off in head
Thanks gentlemen! I have a MIG and will try it tomorrow.
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08-26-2017, 11:55 PM
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#6 |
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motor exploder
Join Date: Mar 2009
Location: Pittsburgh, PA
Posts: 2,346
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Re: Alternator bolt broken off in head
Left hand drill bits almost always work, but if it won't come out with that, I like Irwin bolt extractors. You'll already have a hole to work with. I'm not a fan of regular ez outs.
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Adam 1969 Chevy CST/10 stepside, DART Big M/TREMEC Magnum Extreme/3.73's w/Detroit Truetrac 1965 Chevy Bel Air Wagon (daily driver), 327/TH350,10 bolt w/3.08's 1961 Chevy Bel Air Sport Coupe, ZZ454/M21/9" rear w/3.50's & Detroit Truetrac 2005 GMC 1500 ccsb 2wd, 6.0L/4L65e/3.73 G80 2006 GMC 2500HD ccsb 4x4, DMax LBZ/Allison 6spd/4.56's w/Detroit TrueTrac   Use the SEARCH function on this forum - it is your friend!! |
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08-27-2017, 05:05 PM
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#7 |
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Active Member
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: Alternator bolt broken off in head
The good thing about this broken bolt is that it broke due to either defective bolt or vibration or both. It wasn't because it was frozen in place so it should come out fairly easy with above suggestions. Heat and a little penetrating oil like Blaster or Liquid Wrench will help also.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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09-03-2017, 04:59 PM
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#8 |
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Registered User
Join Date: Jul 2017
Location: Pasadena, CA
Posts: 44
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Re: Alternator bolt broken off in head
Success.
I delayed since I was waiting to borrow the angle drill from a coworker. It saved me from having to remove the radiator shroud. Spun right out after I drilled a 3/16" hole through it. Thanks everyone! 
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James 1971 Blazer 350/SM465/NP205 1966 Chevelle 468/TH400 2009 Corvette Z06 built LS7 |
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09-03-2017, 07:38 PM
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#9 |
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Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
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Re: Alternator bolt broken off in head
Great, I love a story with a happy ending!!!
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Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
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09-03-2017, 09:37 PM
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#10 |
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Senior Member
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,794
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Re: Alternator bolt broken off in head
Thanks for coming back and letting us know how it turned out.
__________________
I have sworn upon the altar of God, eternal hostility against every form of tyranny over the mind of man. - Thomas Jefferson |
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