Head Bolt Torque Value?
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Northstar Engines and System Technical Discussion Discussion, Head Bolt Torque Value? in Cadillac Engine Technical Discussion; Can anyone tell me what to torque the headbolts down to on a 1999 4.6 Northstar engine? I just timeserted ...
  1. #1
    danssts is offline Cadillac Owners Member
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    Head Bolt Torque Value?

    Can anyone tell me what to torque the headbolts down to on a 1999 4.6 Northstar engine? I just timeserted the block, what should I put on the threads to prevent them from coming out?
    thanks, Dan

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    Ranger's Avatar
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    Re: Head Bolt Torque Value?

    You don't put anything on the threads. They are already coated with a thread locker. You are using new bolts aren't you? I don't recall the torque exactly. I seem to recall 37 ft. lbs. and 60 degrees plus 60 degrees, but don't quote me ont that til someone verifies it.

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    AJxtcman's Avatar
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    Re: Head Bolt Torque Value?

    Document ID# 641058
    1999 Cadillac DeVille


    --------------------------------------------------------------------------------


    Subject: SMU - Cylinder Head Tightening Specification Clarification #99-06-01-016 - (10/04/1999)



    Models: 1993 Cadillac Allante, Sixty Special (FWD)

    1993-96 Cadillac Fleetwood

    1993-99 Cadillac DeVille, Eldorado, Seville

    1994-99 Cadillac Concours

    1995-99 Oldsmobile Aurora

    1999 Marine

    with 4.0 L or 4.6 L Engine (VINs C, Y, 9 -- RPOs L47, LD8, L37)




    --------------------------------------------------------------------------------

    This bulletin is being issued to clarify the cylinder head tightening specification listed in the following procedures in the Engine Mechanical 4.0 L and 4.6 L sections of the appropriate Service Manuals:

    • Specifications -- Fastener Tightening Specifications

    • Cylinder Head Replacement -- Installation Procedure

    • Cylinder Head Installation

    The torque specification and sequence for the cylinder head bolts (1--10) using J 36660-A is:

    First Pass -- 40 N·m (30 lb ft)
    Second Pass -- 70 Degrees
    Third Pass -- 60 Degrees
    Fourth Pass -- 60 Degrees (190 Degrees total)
    The torque specification for the three front M6 cylinder head bolts is:

    12 N·m (106 lb in)

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    Re: Head Bolt Torque Value?

    Close, but no cigar. Thanks AJ.

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    danssts is offline Cadillac Owners Member
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    Re: Head Bolt Torque Value?

    Okay Great so with new headbolts there is no reason to put anything on them? What about if I reuse the old ones?

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    Re: Head Bolt Torque Value?

    Quote Originally Posted by danssts View Post
    Okay Great so with new headbolts there is no reason to put anything on them? What about if I reuse the old ones?
    I have always replaced them, But If you want to chacne it you can reuse them. You will need to put Thread Sealer on the threads and the base of the washer. Thread Sealer like Pipe Thead Sealer Not lock tight.

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    Re: Head Bolt Torque Value?

    Quote Originally Posted by danssts View Post
    Okay Great so with new headbolts there is no reason to put anything on them? What about if I reuse the old ones?
    I have always heard that they are not reusable. That is why a gasket kit includes new bolts. I would not reuse them.

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    Harry Yarnell is offline Cadillac Owners Fanatic
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    Re: Head Bolt Torque Value?

    Here's why you shouldn't reuse head bolts. They may look just fine, but they're 'stretched'. The tightening sequence requires a certain torque (40 ft-#?), and three incrimental degree tightening. This tightening puts tension (stretchs) the bolt. Doing it again, weakens the bolt.

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    Re: Head Bolt Torque Value?

    Quote Originally Posted by Ranger View Post
    I have always heard that they are not reusable. That is why a gasket kit includes new bolts. I would not reuse them.
    The bolts ARE NOT TORQUE TO YEILD!
    They are Torque angle and can be reused.
    The Rod bolts are Torque to yield.
    Trust me on this I have been over the description for every bolt type on Northstars.
    The reason GM recomends replacement is so the correct amount of sealer is on the bolt.

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    Re: Head Bolt Torque Value?

    Quote Originally Posted by Harry Yarnell View Post
    Here's why you shouldn't reuse head bolts. They may look just fine, but they're 'stretched'. The tightening sequence requires a certain torque (40 ft-#?), and three incrimental degree tightening. This tightening puts tension (stretchs) the bolt. Doing it again, weakens the bolt.
    I see you must have been trained by our goverment. The Army?
    Do you have any idea how much money a Cadillac heavy duty tech makes?
    We get paid well to know how to fix them.
    The main bolts are torque - angle and they don't get replaced.
    The oil pump bolts are torque - angled and we reuse them also.
    Do you know what a torque - angle is?

  12. #11
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    Re: Head Bolt Torque Value?

    Any number of engines have torque angle head bolts that are reused including HD Deutz diesels.
    Don't mess with Binky Bear!


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    Re: Head Bolt Torque Value?

    I could swear I remember the Guru saying they should never be reused. That is what I based my answer on. Guess I stand corrected.

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    Re: Head Bolt Torque Value?

    I remember *Bbob* saying that too. Maybe it does have to do with the sealant.
    Don't mess with Binky Bear!


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    Re: Head Bolt Torque Value?

    Good to know it is not just me. I also thought he said that they where torque to yield, but I could be mistaken there.

  16. #15
    Harry Yarnell is offline Cadillac Owners Fanatic
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    Re: Head Bolt Torque Value?

    What do I know. I've been a GM wrench for 40 years. I've been told they were torque to yield, and should never be reused. I do as I'm told.

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