3.3 Head bolt question



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Thread: 3.3 Head bolt question

  1. #1
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    3.3 Head bolt question

    I have read in different manuals and the auto parts site recommend replacing the head bolts once removed. The bolts I removed are not stretched. How critical is it to replace them if not stretched??? What about the washers, can they be reused???

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  3. #2
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    Its called torque to yield.Replace them.You dont need them breaking under re torquing or in actual engine usage.For what its worth,from what I read,the 3.3 headbolts are actually old 2.2 bolts.A little bit of K car in almost every minivan....

  4. #3
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    You ALWAYS replace the head bolts when you remove them.

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    Quote Originally Posted by sousa632 View Post
    You ALWAYS replace the head bolts when you remove them.
    Nice 2nd gen.The wheels look great with that color (blue).

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    I concur, just because your bolts don't appear to have stretched, that A) doesn't mean that they haven't, and B) doesn't mean that they won't stretch out of spec or even break when reused.
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    Quote Originally Posted by shipo View Post
    I concur, just because your bolts don't appear to have stretched, that A) doesn't mean that they haven't, and B) doesn't mean that they won't stretch out of spec or even break when reused.
    And that could ruin anyones day...

  8. #7
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    it's very easy to tell if the head bolts are reuseable when installing. when you do the 1/4 turn, use a beam style torque wrench. you'll see torque values drop off as the bolt overstretches. if the torque continues to increase up to the end of the 90deg, it is fine. even in the MP 2.2/2.5 FWD performance book, they even say the 11mm head bolts can be reused several times. In the 100's of 2.2/2.5 head gaskets i've replaced, i've only replaced head bolts less than a dozen times. On my 325 hp 2.2 I freshen that engine after every season and yet I have the same head bolts. that's after 10 years of racing it.

  9. #8
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    Just do yourself a favor and buy new ones. Do you really want to chance having to do it over again if one stretches? To save how much?? 22Dodge seems to have a very good guardian angel cause he contradicts just about everything that is said on the board and has had luck with it. IDK.

  10. #9
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    if you had as much real experience as i have, you would know what and does not work. I don't need a guardian angel. I use intelligence, engineering, metalurgical processes, rational and pragmatic problem solving skills (something that most of society is lacking). if you actually knew the science behind torque to yield bolts, you would understand where I'm coming from. Even chrysler engineers (printed in the afore mentions Chrysler book) state you don't need to replace the head bolts after every use. When torque to yeild fasteners first came out, I was curious as to why. I have gained the knowledge inside an out. I experimented on many many many engines to determine correlations between clamping force and turning torque. I have charted the effects and came up with data support to uphold my last posting statement. I'm sorry if you feel i'm a fool... but I have proof, data, engineering, and experimention to support what I say.... I'm not the joe typical internet dweeb that has to write questions like "How do I change my wiper blades" or "what type of fluid should I use for my washer fluid". or "my car don't start, WTF do I do?"
    Last edited by 22dodge; 03-16-2009 at 07:11 AM.

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    This is from the 1994 F.S.M.:

    INSTALLATION
    (1) Clean all surfaces of cylinder block and cylinder
    heads.
    (2) Install new gaskets on cylinder block .
    The Cylinder head bolts are torqued using
    the torque yield method, they should be examined
    BEFORE reuse. If the threads are necked
    down, the bolts should be replaced .
    Necking can be checked by holding a scale or
    straight edge against the threads. If all the threads
    do not contact the scale the bolt should be replaced.

    (3) Tighten the cylinder head bolts 1 thru 8 in the
    sequence shown in . Using the 4 step torque
    turn method, tighten according to the following values:
    First-All to 61 Nzm (45 ft. lbs.)
    Second-All to 88 Nzm (65 ft. lbs.)
    Third-All (again) to 88 Nzm (65 ft. lbs.)
    Fourth + 1/4 Turn Do not use a torque wrench
    for this step
    (4) Bolt torque after 1/4 turn should be over
    122 Nzm(90 ft. lbs.). If not, replace the bolt.
    (5) Tighten head bolt number 9 (Fig. 11) to 33 Nzm
    (25 ft. lbs.) after head bolts 1 thru 8 have been
    tighten to specifications.


    YES. SAFE WAY is to replace the head bolts everytime, HOWEVER it is not necesssary if you know what you are doing and are familiar with the work and the hardware used. While I would probably recommend anyone doing a 6 cyl now day to replace the bolts (due to work needed to get to the heads again) , I have done many 2.2/2.5 engines without replacing the bolts and have not had any problems, after inspecting them. So, good rule of thumb is to replace however don't knock people who do not replace them. All of us have our little quirks and I also believe that they are up to over well over $3.00 a bolt now. So, if unsure, REPLACE THEM.
    Last edited by DSMLVR; 03-16-2009 at 07:29 AM.
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