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Technical Broken head bolt

Discussion in 'The Hokey Ass Message Board' started by lowrodderchev, Apr 11, 2018.

  1. Working on my girls 53 plymouth ended up with a broken head bolt closest to the firewall any suggestions on pulling it I tried welding a nut to it but it just snaps off. There' barely enough to grab with vise grips if I try to drill it I'll have to pull the motor due to the fireall
    chryslerfan55 likes this.
  2. Right angle drill?
    Weld another nut on it. Crank up the heat.
    Rex Stallion and 29AVEE8 like this.
  3. tb33anda3rd
    Joined: Oct 8, 2010
    Posts: 13,959

    1. Connecticut HAMB'ers

    broke it taking it off, or torquing it on?
    Donuts & Peelouts likes this.
  4. I'm thinking it was torque on her brother pulled the head thinking he went the wrong way cause I pulled the rest and they came off no problem
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  5. tb33anda3rd
    Joined: Oct 8, 2010
    Posts: 13,959

    1. Connecticut HAMB'ers

    i asked because if it broke coming off it is rusted in, if it broke trying to tighten it, it is not stuck, you just need to get it to spin. try tapping it around with a very fine punch. i have been able to get bolts out that way.
  6. I beat on it for a bit. Those plymouths don' have much room lol no luck I had to call it quits my girl was getting mad cause I said I wanted to crush her car lol I offered her my 51 instead
  7. sevenhills1952
    Joined: Mar 14, 2018
    Posts: 527


    If you have room enough for a Dremel tool you may try cutting a slot in it with a cut-off wheel, then remove it with a large flat blade with a square shaft you can put an adjustable wrench on if you need extra torque.

    Sent from my SM-S320VL using Tapatalk... Gary from Virginia
    chryslerfan55, 283john and Irish Mike like this.
  8. saltflats
    Joined: Aug 14, 2007
    Posts: 8,797

    from Missouri

    Pre heat the bolt before you weld the nut on.
    Let it cool repeat the heat and let cool 5 times then try and turn it out.
  9. junkman8888
    Joined: Jan 28, 2009
    Posts: 378


    Acetylene torch. Put some sort of shield between the head and the firewall so you don't set the car on fire, get that bolt red hot, let it cool, walk it out.
  10. 41rodderz
    Joined: Sep 27, 2010
    Posts: 1,127

    from Oregon

    Fire up the torch or welder and hand it to her brother. Get a beer and an easy chair and let the show begin.:D:eek:
  11. Bandit Billy
    Joined: Sep 16, 2014
    Posts: 4,457

    Bandit Billy

    Cut the nut in half. You will get better penetration with your TIG..
  12. Raunchy
    Joined: Apr 16, 2007
    Posts: 353


    I weld a washer on first so I can tie it in, then weld the nut onto the washer.
    1946caddy and lowrodderchev like this.
  13. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,165


    Put a flat washer that fits tightly around the broken off bolt before you weld the nut on; it helps to protect the deck surface. Then, weld the nut on getting better penetration. Then, apply several heat and cool cycles, squirt some penetrant under the washer, loosen/tighten a few times, and pray! Good luck. I am Butch/56sedandelivery.
    chryslerfan55, MMM1693 and harpo1313 like this.
  14. khead47
    Joined: Mar 29, 2010
    Posts: 1,466


    ^^^^^^^^^^^^^^ What he said.
  15. choffman41
    Joined: Oct 30, 2012
    Posts: 2,094


  16. Try melting wax into the threads too. I have found that wax will be drawn down into it when heated better than oil products.
  17. Round 3 I cut a spot to tap on with screwdriver but the metal just ripped next step the washer method that was mentioned up above
  18. tubman
    Joined: May 16, 2007
    Posts: 3,795


    Is the head still on the engine or have you got it off? It doesn't say in the thread. I assume it has been removed, but I thought we'd better be sure.
    chryslerfan55 likes this.
  19. It' a flathead motor heads off bolts broke off in the block
  20. I thought sure it was coming out but after 2 slow turns welds broke

    Attached Files:

  21. If you wind up having to drill it out reinstall the head with a half dozen bolts. then using a drill bit that had a outer diameter that fits snug in the head use that bit to exactly center the start of the drilling.. then using preferably left hand bits drill a small hole first. the keep getting larger. lots of times when you get the bolt thin the left hand bits will back it out.
  22. I just didn' want to have to pull the motor but due to the closeness of the motor to the firewall guess I'm screwed
    chryslerfan55 likes this.
  23. Could make her brother pull it, you get the broken off bolt out then he re-install it. Every bolt he puts anything on make him repeat; RIGHTY TIGHTY, LEFTY LOOSEY, while you sit back and drink your favorite refreshment. After all he broke it.
    chryslerfan55 likes this.
  24. Raunchy
    Joined: Apr 16, 2007
    Posts: 353


    I would use a washer and nut with no rust. maybe even ground to new metal. you need a good strong weld with no contamination. Tie the weld in with the washer then the nut get a good solid weld. If you are using a mig remember it starts out cold. So start on the washer and move to the stud and make a hot circular weld on it then the nut. Sometimes it takes numerous try's. But I have always had this work for me. Candle wax or penetrate oil helps while it is still hot.
    chryslerfan55 likes this.
  25. Andy
    Joined: Nov 17, 2002
    Posts: 4,293


    The first weld always broke for me. Try again and get it really hot. You won't hurt the block and it anneals the stud. Don't try to get it out in one continuous turn. If if it turns some, work it back and forth and also heat it some and melt in some wax. The wax is really a miracle.
    chryslerfan55 and egads like this.
  26. kidcampbell71
    Joined: Sep 17, 2012
    Posts: 3,602

    1. 60s Show Rods

    Wow. Finally one for me ! You'll have to soak that b#tch with atf/acetone or Kroil for a few weeks.

    Mine was broken deeper, so I got lucky. I got some 303 rod in 7/16" and sectioned it 3 times. Had to find a HAMB'r .... Don from Don's Race Fab ... with a lathe .... to drill the lengths in 4 stepped sizes from small to just under the rod size. Why ?

    Drill guides !! That's why.

    I purposely planned to be lazy ... and keep my heads on the engine. Why waste a gasket set ?

    I used some 5 inch aircraft LEFT handed drill bits, and attacked. Came out on the last drilled guide.

    I'll attach some pictures, for the HAMB'r that finds this post on a deep broken head bolt.

    You don't need to do what I did, or maybe you could. Just need something to center the bit, and drill into the center of the broken bolt. More so .... a sh#t ton of soaking solvents. It wouldn't have backed out without that.

    Don't forget a magnet, and drain your antifreeze .... from the cooling system. It will rise thru the bolt hole, and go right .... into the oil pan, otherwise.

    Good luck.

    EDIT : 7" LEFT HANDED DRILL BITS !! Went to re-measure because of your firewall issue. 7 inch drill bits and an angle drill help you hit that ? ( may get a screwy answer to that :) ) < ba dum bum bum !! >
    20170716_113501.jpg 20170716_113029.jpg 20170716_113045.jpg 20170716_113309.jpg 20170716_140015.jpg 20170716_140702.jpg 20170716_140711.jpg
    Last edited: Apr 17, 2018
  27. Desmodromic
    Joined: Sep 25, 2010
    Posts: 113


    Be careful with the righty-lefty advice! Don't Mopars of that vintage have left-hand threads on the wheel lugs on one side of the car?
  28. Bought easy out used oil and on blast wore out 2 bits and broke one and it still hasn' drilled through it yet smh
  29. 56sedandelivery
    Joined: Nov 21, 2006
    Posts: 5,165


    EASY OUT? DO NOT use an Easy Out; if you break the Easy Out off, then you're really stuck, and a lot of guys break them. Find a big open field, and throw that Easy Out as far out into the field as you possibly can, unless it can be returned. You may have to buy some expensive, quality, bits, and go with consecutive sizes; preferably left hand twist like our fellow HAMBER above demonstrated. AGAIN, NO EASY OUT !!! See if an automotive machine shop will do a house call, and make the brother pay for it. I am Butch/56sedandelivery.

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