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Thread: head torque specs?

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    head torque specs?

    anyone know the torque specs for a 2.4 Ecotec for my daughters G6 she destroyed the radiator and overheated it and i would like to retorque the head

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    I don't know the specs off hand, but I can find out. However, you may not want to do that. The bolts are torque to yeild, and if you take them out its definitely recommended that you replace them. If your plan was to just re check them, there isn't a very good way of doing so. The torque sequence for factory head bolts is a specific inital torque, say 45 ft. lbs. Then on the second pass they usually tell you to go an additional 90 degrees or 60 degrees or some degree amount. SO, there isnt really a good way to go over and re check them without loosening and re-torquing through the sequence (if that makes sense, and if I explained it clear enough.) So, not to sure you want to try doing that or not. i'll try to find the spec anyways
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    You cant retorque the head bolts on the ECOTEC, and there'd be no reaason to do so unless you had a leak, at which point you'd need to nspect the mating surfaces and replace the gasket. But.... the 10 large bolts get tightened to 22lb-ft in sequence and then an additional 155 degrees in a second pass in sequence. The 4 small bolts go to 26lb- ft.
    The torque pattern looks like this from the front of the car:

    7 3 1 5 9
    10 6 2 4 8

    and then the four small bolts
    I know stuff about ECOTECS

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    Angry head bolt torque

    thanks for the info. i havbe ordered a complete set of G6 shop manuals. the reason for the need for specs is my daughter bottomed her car at a speed (i'm sure at a high rate of speed) abd destroyed the radiator mounts and the bottom of the rad. as well as overheating it and blowing the head gasket.

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    Screw torquing it broke one of my screws screwing the VC back on so now I have a half broken screw in the head... =/ not sure how I'd get it out either.... and I set it to the correct torque too...
    Last edited by Chevy Cobalt 08; 03-21-2009 at 06:40 PM.


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    If you set it to the correct torque and threaded it in properly its incredibly unlikely that it broke? What did you torque it to?

    You need to remove the broken off section of bolt and repair the threads with a tap or insert if they are severley damaged, If you dont know what I am talking about you need to see someone who does.
    I know stuff about ECOTECS

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    Who might I be able to take it to? Like any specific place? I had it on the right torque and it went in fine I just kept screwing it waiting for it to torque then next thing I know SNAP! I got the torque spec out of the haynes manual.... And yes it was set at the right torque.


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    what was the torque spec? Shouldve been like 10nm, or 81 INCH pounds.

    Machine shop, dealer, any good repair shop.
    I know stuff about ECOTECS

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    Dealer? Yeah right they'll void my warranty so fast :lol:


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