Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know - Page 30
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  • 1993

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Northstar Engines and System Technical Discussion Discussion, Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know in Cadillac Engine Technical Discussion; Joe, have you been tapping the block on these coarser threaded head bolt engines? it is my understanding that all ...
  1. #436
    RippyPartsDept's Avatar
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    Joe, have you been tapping the block on these coarser threaded head bolt engines?

    it is my understanding that all the failures in engines with the coarser threaded head bolts were due to the bolts not being tight to begin with and not from pulling out
    that then causes the gasket to fail compounding the issue
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  2. #437
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    From a mechanical standpoint I like fine threads on studs/head bolts. It allows for more precise torque application as opposed to an initial torque then degree sequence.

    Coarse threads in aluminum are just fine for the "meat" of an insert or stud grab - then sneak up on proper torque with well-rolled fine threads on the stud/nut or the original fine threads on a head bolt into a large insert. Look at the threads in Norm's Inserts. Coarse outside, fine inside.

  3. #438
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    yeah, that's the same as the bigsert approach
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  4. #439
    JoeTahoe is offline Cadillac Owners Fanatic
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    Chris when did the coarse threads start as I haven't had any thing newer than a 02 myself. Tomorrow a 04 deville is being delivered to me and I just gave my knowledge on a 05 but I did not see it. But they studded it with jakes studs

  5. #440
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    some 2004 ... but all 2005

    see this thread for the nitty gritty details
    http://www.cadillacforums.com/forums...ead-pitch.html
    Chris Heath (RippyPartsDept) is an ASE Certified GM Parts Consultant at Rippy Automotive
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  6. #441
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    thanks for the link that is a must have, Takes a lot of guess work out

  7. #442
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    Yeah... that's definitely one of the little golden nuggets that you often find around these parts
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    This forum is the bible for all caddy owners

  9. #444
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    Re: Definitive Northstar Headgasket Thread

    But only 8 people in the world know that - the rest never search for the answers to every Cadillac problem: They're already posted in the stickies in each forum threads header and in Discussions, Cadillac Tech Tips.

  10. #445
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    Re: Definitive Northstar Headgasket Thread

    Quote Originally Posted by Submariner409 View Post
    But only 8 people in the world know that - the rest never search for the answers to every Cadillac problem: They're already posted in the stickies in each forum threads header and in Discussions, Cadillac Tech Tips.


    SO, Jim, WHO are those 8?

    Kidding, kidding

  11. #446
    JoeTahoe is offline Cadillac Owners Fanatic
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    Ok this is the second one I have had apart in the last two weeks. It appears to me that the head gaskets failed no aluminum pulled when removing the bolts 1st one was a 02 DTS with fine threads 2nd one is a 04 Deville with coarse threads, both failed #1 cylinder I will post pics once I go in

    ----------


    fine tread vs coarse





  12. #447
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    Well, these are aluminum engines. They run the risk of HGs, it's just WAY less with coarser threads.

  13. #448
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    One would figure that a car with less than 100, 000 miles and under 10yrs of age woud not have this problem. Again this is just my thoughts

  14. #449
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    Re: Northstar Headgasket/Cracked Block/Bolt Failure? Please let us know

    Hmmmmm................ Your latest set of pictures makes a powerful argument for the "Either/or: Gasket/bolt" failure.

    That IS one pathetic looking head gasket.

  15. #450
    JoeTahoe is offline Cadillac Owners Fanatic
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    Sub the last 2 were definitely headgasket failures not thread failures

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