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Thread: lose head bolts?

  1. #1
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    Cool lose head bolts?

    i have a coolant leak and its leaking from between the head and block in 1 little spot
    its right by one of the head bolts
    could this be a lose head bolt i did use m p heads bolts
    has anyone have this happen before

  2. #2
    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: lose head bolts?

    How did you torque them down and what value?

    Could be damaged gasket, damaged head, damaged block or bolts too loose.
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    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: lose head bolts?

    If you properly torqued the bolts down I find it hard to believe that it is due to a loose bolt.

  4. #4
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    Re: lose head bolts?

    Quote Originally Posted by turbovanman View Post
    How did you torque them down and what value?

    Could be damaged gasket, damaged head, damaged block or bolts too loose.
    i torque them down in the right order torque all of them to 45lbs then to 65lbs then a quarter turn not sure what value its by
    but is by head bolt #3
    l had head work done and i used m p head bolts and gasket i put more then 200 miles on the car before it leak

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    Buy my stuff!!!!!!!!!!! :O) Turbo Mopar Vendor turbovanmanČ's Avatar
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    Re: lose head bolts?

    Try retorquing them.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  6. #6
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    Re: lose head bolts?

    ill do that and see if leaks again

  7. #7
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    Re: lose head bolts?

    What would you retorque them to? I think there's an underlying issue here.

  8. #8
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    Re: lose head bolts?

    Is it possible that there is debris at the bottom of the bolt hole? I have had to grind a bolt shorter in the past due to this.

  9. #9
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    Re: lose head bolts?

    dusty are you sure its not one of the exhaust studs leaking coolant??

  10. #10
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    Re: lose head bolts?

    Quote Originally Posted by Juggy View Post
    dusty are you sure its not one of the exhaust studs leaking coolant??
    im sure lts leaking in the front

  11. #11
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    Re: lose head bolts?

    Quote Originally Posted by shadow88 View Post
    What would you retorque them to? I think there's an underlying issue here.
    Lets say you set them at 45 ft/lbs and went a 1/4 turn, I would loosen one by one and tighten to 50 ft/lbs and a 1/4 turn, so just add about 5 ft/lbs.

    Quote Originally Posted by jory View Post
    Is it possible that there is debris at the bottom of the bolt hole? I have had to grind a bolt shorter in the past due to this.
    Yes, that is possible, especially if you didn't chase the threads and blow all the crud out.
    1989 FWD Turbo Caravan-2.5 TIII, GT35R, auto, a/c, cruise, pwr windows/locks, fully loaded with interior and ran with full exhaust. RETIRED FOR A FEW YEARS! 12.57@104 :O)
    1984 Chev Getaway van, 6.2 Diesel with a remote mounted turbo setup burning WMO-For sale.
    2003 GSW 2.0L TDI, auto, fully loaded, modified, 360K-wife's.
    2004 GSW TDI, 5 speed, fully loaded, modified.

    Aurora ignition wires for sale. Link to info

    Super60 roller cams or custom/billet cams. Link to info

  12. #12
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    Re: lose head bolts?

    Quote Originally Posted by 663csx-t View Post
    im sure lts leaking in the front
    lol ok just makin sure. i just figured it was in the back, thats where i usually get them.

  13. #13
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    Re: lose head bolts?

    well i loosened them all then re torque them 45 then 65 then a lil more then a quarter turn

  14. #14
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    Re: lose head bolts?

    OK, let us know how that goes... usually re-torque does NOT mean loosen them, it means snug them all up to like ~95 ft-lb

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    Re: lose head bolts?

    Quote Originally Posted by BadAssPerformance View Post
    OK, let us know how that goes... usually re-torque does NOT mean loosen them, it means snug them all up to like ~95 ft-lb
    i see ill let you know
    so is that what 65 lbs plus a quarter turn is

  16. #16
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: lose head bolts?

    Approximately

    The 65 plus a 1/4 turn is really to drive it to a dimension and take the variables of torque out, and these are torque to yeild bolts so they can yeild at or before 95... thats why they recommend not reusing them as they are supposed to stretch permanently an donly do this correctly once.

    Snugging them all to 65 in sequence twice makes sure they are all similarly torqued. The 1/4 turn is designed to compressing the assembly 0.375mm more (1/4 of 1.5mm thread pitch) and final torque *usually* is very similar between them but can be off as some are 90 and some are 95, etc. The final torque for each hole depends on crap in the threads, oil on the threads, etc.

    IIR the 3 little feet on the OEM washers were to ensure that the washers did not rotate on the aluminum head but instead drove the rotation (torque) to the washer/bolt head interface for consistancy.

    I usually use a beam style torque wrench when I do the 1/4 turn and watch where it ends up and tell myself not to try and match them, LOL...

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  17. #17
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    Re: lose head bolts?

    it still leaks ill have to get a new head gasket and head bolts

  18. #18
    See me ride out of the sunset... Turbo Mopar Staff BadAssPerformance's Avatar
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    Re: lose head bolts?

    Ouch, sorry to hear man.

    When you have it off, make sure the head and block are flat with a straight edge. If one is warped, no head gasket or bolts will seal it.

    JT
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  19. #19
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    Re: lose head bolts?

    Quote Originally Posted by BadAssPerformance View Post
    Ouch, sorry to hear man.

    When you have it off, make sure the head and block are flat with a straight edge. If one is warped, no head gasket or bolts will seal it.
    true i will do that for sure

  20. #20
    Rhymes with tortoise. Turbo Mopar Staff cordes's Avatar
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    Re: lose head bolts?

    Quote Originally Posted by BadAssPerformance View Post
    Approximately

    The 65 plus a 1/4 turn is really to drive it to a dimension and take the variables of torque out, and these are torque to yeild bolts so they can yeild at or before 95... thats why they recommend not reusing them as they are supposed to stretch permanently an donly do this correctly once.

    Snugging them all to 65 in sequence twice makes sure they are all similarly torqued. The 1/4 turn is designed to compressing the assembly 0.375mm more (1/4 of 1.5mm thread pitch) and final torque *usually* is very similar between them but can be off as some are 90 and some are 95, etc. The final torque for each hole depends on crap in the threads, oil on the threads, etc.

    IIR the 3 little feet on the OEM washers were to ensure that the washers did not rotate on the aluminum head but instead drove the rotation (torque) to the washer/bolt head interface for consistancy.

    I usually use a beam style torque wrench when I do the 1/4 turn and watch where it ends up and tell myself not to try and match them, LOL...
    I too have the same problem not wanting all the bolts to be right at the same torque. I forget which ones now, but there are a couple which always seem to not quite torque to the same numerical value as the others. It hasn't caused a problem yet for me though.

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