1. Registration trouble? Please use the "Contact Us" link at the bottom right corner of the page and your issue will be resolved.
    Dismiss Notice

1970 134 Fhead Head Gasket Replacement

Discussion in 'Early CJ5 and CJ6 Tech' started by jeepstar, Nov 14, 2016.

  1. Nov 28, 2016
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    4,301
    They go into the water jackets. Forgot about that. Use the locking side of the zip tie and "hook" it inside to find the bottom of the threads where it opens up into the jacket. Mark the zip tie where it hooks and measure that.
     
  2. Nov 28, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    5.75 inches. Get that length of a bolt?
     
  3. Nov 28, 2016
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    4,301
    Is that with the head on?

    I'll let someone else chime in. I have a redneck, just-get-it-running, farmer-Joe mentality when it comes to these old engines, and my opinions would probably be frowned upon by the purists. :whistle:
     
    Focker likes this.
  4. Nov 28, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    5.75 inches from the underside of the threading in the block, to the top surface of the head. I have been a stickler on just about everything except for this. I've drove it (and fixed it) more this past summer than I have since I've owned it, and that's been 15 years. I just want to drive it!
     
  5. Nov 28, 2016
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    6,904

    Why???? You haven't "snapped" any bolts yet - and you won't, if you keep those hardened Grade 8s.

    But you may strip out a bunch more holes unless you replace them all with the right length.

    No point to heli-coiling any more than you have to * but * I'd be concerned the other holes may have threads damaged and weakened by those too-short bolts being torqued close to the limit.
     
  6. Nov 28, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    Bolts are 4.5" long....1/4" longer than the 4.25" long bolts. NEW, new one is 6". if that dont bite, then its helicoil time.

    Helicoil is 22 cents. the wrench to install it is 22 bucks....w....t...f....
     
  7. Nov 28, 2016
    Twin2

    Twin2 not him 2020 Sponsor 2019 Sponsor

    Virginia Beach, VA
    Joined:
    Apr 28, 2011
    Messages:
    4,201
    you really need to buy the kit . drill , tap . installer tool
     
  8. Nov 28, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    Link?
     
  9. Nov 28, 2016
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    6,904
    Google? Ebay? Amazon?

    Try any of them, it took me less than 30 seconds to find full kits for $20
     
  10. Nov 28, 2016
    PeteL

    PeteL Member 2020 Sponsor 2019 Sponsor

    Hills of NH
    Joined:
    Aug 3, 2003
    Messages:
    6,904
    I'd call that a bargain compared to an hour of machine shop time. Or a new engine block.
     
  11. Nov 28, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    And its cyber monday...hmm-mm
     
  12. Nov 29, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    I tried the bubba method and it did not work. Helicoil here I come!

    20161129_061040.jpg
     
  13. Nov 29, 2016
    1960willyscj5

    1960willyscj5 Well-Known Member

    Mesa, Arizona
    Joined:
    Nov 27, 2006
    Messages:
    2,793
    Why would Costco have a torque wrench analyzer? The ones near me don't even have torque wrenches in the tool section.
     
  14. Nov 29, 2016
    ITLKSEZ

    ITLKSEZ Volvophilic

    Post Falls, ID
    Joined:
    Aug 13, 2015
    Messages:
    4,301
    I think he meant in the tire bay.
     
  15. Nov 29, 2016
    Focker

    Focker That's what I do, I know things and I fix stuff. Staff Member 2019 Sponsor

    Tri-Cities WA
    Joined:
    Aug 18, 2014
    Messages:
    6,646
    Yes in the Tire Shop, sorry for not clarifying.
     
  16. Nov 30, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    Picked up the helicoil kit. no directions or drill bit included.
    1. everything i read indicates a 29/64" bit. true?
    2. how deep do i sink the helicoil in the block?
     
  17. Nov 30, 2016
    Keys5a

    Keys5a Sponsor

    Florida Keys
    Joined:
    Jan 23, 2014
    Messages:
    2,633
    Helicoils come in a few different lengths, so it depends on what length you got. Some are only about 3/8" long, others about 1/2" long, and finally about 5/8" long. Two shorter helicoils can be stacked, but you must remove the drive tang from the deeper one before you start the second one. It also takes some careful calculations to get the stacked height correct. You ultimately want the top coil end just flush with the head gasket surface.
    -Donny
     
  18. Nov 30, 2016
    Oldriginal86

    Oldriginal86 Member

    Pasadena, Md.
    Joined:
    Nov 5, 2014
    Messages:
    508
    It's been a few years since I built an Fhead. I believe there should be a counterbore in the block of a certain depth void of threads. Not sure how deep this is. Should be able to measure a good hole. The helicoil shouldn't be flush with the top of the block due to the pull of the bolt. It will pull the insert above the surface. Even if there is no counterbore in the block, I would install the insert at least one thread deeper then flush.
     
  19. Dec 4, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    Drill is bigger than my engine, probably more powerfull too. :D
    20161204_161701.jpg
     
  20. Dec 4, 2016
    jeepstar

    jeepstar Well-Known Member 2020 Sponsor

    Sheboygan
    Joined:
    Jun 28, 2006
    Messages:
    1,554
    Drill is bigger than my engine. now what? hand drill?
     

Share This Page

New Posts