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Head Studs

Discussion in 'Early CJ5 and CJ6 Tech' started by Kevan Bowen, Apr 17, 2022.

  1. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Greetings, I've searched the forum and not had much luck with my question, I would like to run studs instead of bolts on my f134, my guess is they need to be longer than the bolts, and can't really find a vintage type supplier, I'm thinking that I may be able to just go to an auto parts store and find some, Thoughts?
     
  2. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    The ones I'm finding are pretty spendy, If anyone is running them I would sure appreciate knowing the proper length to buy
     
  3. Apr 17, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
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    Why do you want to do this? Also I don't think you will have clearance for studs under the rocker shaft.
     
  4. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    The advantages of using studs vs bolts are numerous, my problem is getting the head bolts to seal properly, I'm thinking that using studs might help, if the bolt head and stud nut are similar in height then I don't see much of a difference in rocker shaft clearance, but that is why I am asking if anyone has done it and what would be the proper length of stud to use to avoid clearance issues
     
  5. Apr 17, 2022
    termin8ed

    termin8ed I didn't do it Staff Member

    Mason, MI
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    What are you trying to seal to?
    If it's the head bolts into the water jacket I would use aviation sealer from permatex.
     
  6. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Well, kinda a long story, I'm trying to save an engine with a cracked block, I have a rebuilt engine of unknown quality and would like to try and save the currently installed one, so really not out much to try and hillbilly this one back together. I'm thinking studs might help the situation, but not sure
     
  7. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Yikes...no offence to Hillbillys, I are one
     
    Fireball likes this.
  8. Apr 17, 2022
    Oldpappy

    Oldpappy A.C. Fults - Curmudgeon at large 2022 Sponsor

    East Tennessee
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    Head studs for a L-134 might work. I always replace them when I build an engine so I could send you some old ones to try out.

    The reason you aren't finding them from the parts suppliers is they didn't use studs on the F-134, but they did on L-134 engines. New studs for an L-134 are easy to find, but if you want old ones just to try I am sure I have some.
     
  9. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Thanks Oldpappy, I have a bunch of studs for the l134, to short for sure. I will probably use a combination of studs and bolts, bolts on the inside under the rocker and studs on the outside, I have a crack in the bolt hole between number 2 and number 3 cylinders, both sides of the bolt hole are cracked into the water jacket, it's the hole nearest the exhaust side. I'm hating to junk this block, but might have to happen.
     
  10. Apr 17, 2022
    duffer

    duffer Rodent Power

    Bozeman, MT
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    You might call ARP. If you have all the lengths, they can probably put together a set for you. They aren't cheap and way overkill for 7.5:1 CR. I don't think studs will improve the cracked block situation much as they should be torqued to the same spec as the head bolts but maybe worth a try. Cracks in that location are not uncommon. ARP thread sealer is also a very good item. https://www.summitracing.com/parts/...MI-qOZ78Gc9wIVgdCWCh39JATPEAQYASABEgIh7_D_BwE
     
  11. Apr 17, 2022
    PeteL

    PeteL If it wasn't for physics, and law enforcement... 2024 Sponsor 2023 Sponsor 2022 Sponsor

    Hills of NH
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    Works for me.
     
  12. Apr 17, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I don't see any benefit in using studs either. I've used sealer for the same problem too.
     
  13. Apr 17, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    my problem is the bolt breaks loose at 20 ft/lbs, I'm thinking that using a stud there I can jb weld the sucker in there, also if the threads were a little longer I can get into some better threads in the block, I warned you this is a hillbilly setup!
     
  14. Apr 18, 2022
    Bondo

    Bondo Master General Re-Engineer,...

    Greenfield Me.
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    Ayuh,.... Put a heli-coil in that hole,..... it might hold, but you really need a different block,....
     
  15. Apr 18, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    would that hold with both sides of the bolt hole split to the water jacket? didn't think that would be an option
     
  16. Apr 18, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Like I said earlier, I have a rebuilt engine sitting in the shop of unknown quality ready to go in, I was just hoping I could Hillbilly this one, kinda just to see if I could save the old block, at least I know this ones issues.
     
  17. Apr 18, 2022
    Glenn

    Glenn Kinda grumpy old man Staff Member

    Apopka, Fl
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    I'm assuming you have the head on and the one bolt hole is the problem. Have you considered, just for measurement purposes using a threaded rod? Mark it an inch longer than the head bolt and then screw it in so you have just enough left to get a nut on just to verify that it will go that far. Take it back out and the mark the threads with something that will come off when screwed into the block but the rest will stay. Remove it and then damage the next theads so it will in effect bottom out and you could then see if you could get it to hold with more torque applied. That would at least give you the length you need for an appropriate stud, including the minimum thread length you need for the end in the block. Of course if it still won't hold then I'd say use the other engine.
     
  18. Apr 18, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Thanks Glenn, the head is off, after it was off I did make a sleeve and tried to torque the bolt with deeper engagement in the bolt hole, it did seem to help, although I used a piece of copper tubing and it started to crush the tubing so I need to make a better sleeve or just use a shorter bolt and some washers and see how much torque I can apply
     
    Glenn likes this.
  19. Apr 18, 2022
    SIDSCJ

    SIDSCJ Jeep addict

    14th State
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    Pretty sure studs are not going to save the head gasket with a crack in the block.
    Squeeze it all you want, but as soon as it warms up you'll be pushing coolant into the cylinder.
    BTDT.
     
  20. Apr 18, 2022
    Kevan Bowen

    Kevan Bowen New Member

    Idaho
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    Well at this point the old saying "what have I got to lose" applies
     
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