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Thread: 7120 #11 Head Bolt Failure

  1. #1
    Join Date
    Nov 2009
    Location
    El Mirage, AZ
    Posts
    57

    Default 7120 #11 Head Bolt Failure

    After replacing the head gasket in my '95 XJ, a hairline crack was noticed around the #11 bolt hole, front to back around the bolt hole on the head gasket. Upon further review, a crack was noticed on the cylinder block in the same location as well. Everything else is visually inspected to be in pristine condition.

    As this is my only daily driver, we installed the new head gasket and torqued the head down to specs, hoping for the best only using Teflon tape instead of Loctite 592 on the #11 bolt.

    My question is, how exactly would this area seep coolant? I am assuming it would be from under the head of the bolt, and leaking into the valve cover, idk?

    My only brainstorm as a temporary fix is to remove the bolt, and packed the threads and the head of the bolt with a Loctite, re-torque, and, let it cure..

    Does anyone have any other suggestions besides the obvious, "Start Over!"?

    Thanks in advance.
    Happy New Year, and Happy Trails
    "Keep Coming Back, It Works If You Work It"!!!
    Jim- XJ Addict

  2. #2
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: 7120 #11 Head Bolt Failure

    I am not really sure on that. What I would do is consult an auto machine shop and see what they recommend. That one in the block would concern me more than the one in the head.
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  3. #3
    Join Date
    Nov 2009
    Location
    El Mirage, AZ
    Posts
    57

    Default Re: 7120 #11 Head Bolt Failure

    Unfortunately, it's "Start Over".

    I just re-torqued all the head bolts after applying the Loctite 592. Bolt #11 clacked before clicking to 100 pounds. The bolt appears to be fine.

    Looking like it's time to shop for another motor..

  4. #4
    Join Date
    Sep 2009
    Location
    Chico, CA
    Posts
    29,847

    Default Re: 7120 #11 Head Bolt Failure

    Sorry to hear that, but I thought that might be the case. If you have to do this again, make sure you don't use bolts that have already been torqued twice. They stretch.
    230 hp 4.3L Chevy
    Built 4L60E with manual lockout
    Atlas 4 speed
    Griffin radiator
    On board air
    Warn 9.5ti on custom bumper
    7.5" RE front and bastard pack rear on custom long arms
    30 gal gas tank
    lockers
    And a bunch of other stuff

  5. #5
    denverd1's Avatar
    denverd1 is offline Level: Uber Jeep Cherokee Trailer Queen
    Join Date
    Dec 2011
    Location
    Tyler, Texas
    Posts
    5,762

    Default Re: 7120 #11 Head Bolt Failure

    that sucks!

    good thing is 4.0s are plentiful
    Wheelin' East Texas in a RED XJ

    RED 98 XJ with 4.5" lift, ZJ steering, front and rear locked on 33's
    cowl intake, Cobra CB, SYE, bumpers, 10K winch, lights
    ,___________
    //___l__,\____\,00_
    l_--- \___l---[]lllllll[]|
    (o)_)--(o)_)--(o)_)

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