Stripped Head Bolt Threads
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HT4100 4.1, 4.5, 4.9 Discussion, Stripped Head Bolt Threads in Cadillac Engine Technical Discussion; What do I need to repair stripped head bolt threads on a 1992 DeVille 4.9L ? I contacted Timeserts.com but ...
  1. #1
    Lacky is offline Cadillac Owners Member
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    Stripped Head Bolt Threads

    What do I need to repair stripped head bolt threads on a 1992 DeVille 4.9L ? I contacted Timeserts.com but they do not have a kit for this engine.

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  3. #2
    derrty_deville's Avatar
    derrty_deville is offline Cadillac Owners Enthusiast
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    Re: Stripped Head Bolt Threads

    on the bolt or the block? replace the bolts and the block will need to be tapped at a machineshop. its a precision thing. cant be off

  4. #3
    Lacky is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    The head bolts threads in the aluminum block are stripped out on bolts 1-2-3 which torque at 90lbs. Didn't blow the gaskets but combustion gasses were getting into the cooling system. When replacing the heads I got to 40ft lbs. and the threads came out. I need to install thread inserts but don't know what to use. Timeserts seem to be preffered but I emailed Timeserts.com and they only have kits for the N-Star engines. I was hoping the blocks were the same but it seems they're not.

  5. #4
    drewsdeville is offline Cadillac Owners Master
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    Re: Stripped Head Bolt Threads

    I actually used helicoils in my '92 Deville. They held up great all the way till the end when the car was totalled by the guy who rearended me I've been through what you are experiencing right now man. It's frustrating to finally be on your way assembling the engine rather than disassembling and then strip out them threads. ? But anyway, you can get the correct size helicoils from probably anyone that sells helicoils. I'd also recommend getting new gaskets however...they have already been compressed from your installation and new ones will be needed. Good luck!

  6. #5
    Edahall's Avatar
    Edahall is offline Cadillac Owners Enthusiast
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    Re: Stripped Head Bolt Threads

    You might want to try posting this message on the other board.

    www.caddyinfo.com

    According to bbob, the 4.9 can be timeserted according to the following post

    http://caddyinfo.ipbhost.com/index.p...topic=4771&hl=

  7. #6
    BeelzeBob's Avatar
    BeelzeBob is offline I'm a Cadillac Fanatic!
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    Re: Stripped Head Bolt Threads

    I would use the standard Timesert kit for an M12 x 1.75 bolt which is what the 4.9 head bolts were I think....

    Those bolt holes were often repaired successfully with helicoils. Since they are larger bolts and are not as heavily stressed as the Northstar bolts the helicoils seem adequate and actually were an approved means of repair.

    Personally, I would use the standard timesert kit, though.

  8. #7
    Lacky is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    Well I'm finally getting the 4.9 reassembled. For anyone with stripped head bolt threads on this engine, I would not suggest using Timeserts as there is not enough clearance in the bolt valley for the countersink tool or the lip on the insert itself. Had to grind the lip off to install them. Also had to drill the upper hole to allow the tap through. This has been a nightmare. About the time you think you've figured it out, something else rears it's ugly head. Kent-Moore has tools for this engine , part# J-29610 that may be the best way to go. I would have bought this if SPX.com would have been interested in selling me one. BTW bbob is correct on the bolt size - 12mmX1.75mm

  9. #8
    jadz's Avatar
    jadz is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    What does the Kent-Moore J-29610 tool do /what is it, a helicoil insert kit?

  10. #9
    jadz's Avatar
    jadz is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    I'm trying to find the tool on gmde.net (a SPX.com site) and also on http://servicesolutions.spx.com/welcome.html without much luck.

  11. #10
    jadz's Avatar
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    Re: Stripped Head Bolt Threads

    XXXXX,

    The current cost on part number J-29610, engine thread repair kit is $841.66.

    Sincerely,
    XXXXX

  12. #11
    zonie77 is offline Cadillac Owners Connoisseur
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    Re: Stripped Head Bolt Threads

    It looks like helicoils are recommended by GM. The Kent-Moore tool is a helicoil kit.

  13. #12
    CBARTMAN is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    I used Heli coils on mine, and they held fine. I forget what the heli coil kit was but it was about $150 or so, for the insert tool and coils

  14. #13
    beveluv is offline Cadillac Owners Member
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    Re: Stripped Head Bolt Threads

    CBARTMAN, Where were you able to find your Heli Coil kit for your 4.9L? I have been searching everywhere for this kit. I just need to heli coil 1 bolt hole.

  15. #14
    jadz's Avatar
    jadz is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    I'll check to see how many coils are left in my kit (which I'm willing to sell).

  16. #15
    MrEldo97 is offline Cadillac Owners Fanatic
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    Re: Stripped Head Bolt Threads

    Can you helicoil a 4.9 with the motor still in the car or must you drop the cradle to do so (like the Northstar).
    I Timeserted the Northstar in my '97 Eldorado and I've recently been considering selling my '97 and picking up a '90 or '91 with a 4.9.

    Any advice?

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