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  1. #11
    Ski Hacks MG's Avatar
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    After reading on ARP's sight, I understand "stretching" a bit more now.


  2. #12
    To much is never enough Badvgood's Avatar
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    I have all the bolt stretch lengths written down and in the box the rods came in on the ARP sheet. As the rod bolts are not blind you can measure the stretch after tightening. All done on day one and then rechecked by two of us on day two.

    Kinda wish I had ripped it apart tonight to see but felt tired earlier

  3. #13
    Moderator beerdart's Avatar
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  4. #14
    Turbonut's Avatar
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    That sux big time!!
    I'll be interested to see what you find. My motor is about to go back together with Molnar rods.

    I'm a bit nervous now!

  5. #15
    shrabber's Avatar
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    First it trully sorry as it can happen to anyone. That's why it is so critical to stretch rod bolts with aftermarket bolts and rods. Looking at the cap with no bolts looks like they backed out and broke off.

  6. #16
    wotxxxsd's Avatar
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    I hope your luck gets better real soon..
    With that kind of day what else could go wrong??

  7. #17
    West Texas RXP skoepp's Avatar
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    Sorry to see that.
    Be interesting what you find.

  8. #18
    To much is never enough Badvgood's Avatar
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    Morning All,

    Well as things happen in threes I went to bed last night early before anything else could go wrong!

    Taken another look at it today and it would seem that the fastener has snapped letting the cap come loose and rod off of the crank.

    As I see it this could only happen if;

    a) It was a defective fastener and it gave way
    b) The other fastener we cannot see yet either broke putting too much stress on the remaining one OR the other fastener backed out due to a tightening problem
    c) Some sort of oil loss problem causing excess heat
    d) Overtightening of it causing a weak spot

    Any further thought out there until I get it stripped down

    Shrabber, can you expand on the comment you made above please?

    Looking at the instructions that came with the Molnar rods with the ARP bolts it gives two methods of tightening.

    Either 25 ft lbs + 55 deg

    Or

    Stretch .0055" to .0059"

    The bolts were measured before first use and the size recorded. I thought if you were to ever reuse them you had to check the length of the bolt. If it had returned to its original length + no more than .0005 it was good to go again.

    However these were all new and first time use.

    Have I missed something here as you say 'Aftermarket' bolts - 99% Of the stuff I done when building was all OEM.

    Thanks all.

    Click image for larger version. 

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  9. #19
    dnielsen's Avatar
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    Always stretch these bolts, the torque value given is a DNE (do not exceed) but I have found in the past that ARP has had issues with the DNE info due to an incorrect printing. Not sure if they have ever corrected the issue. You MUST stretch every rod bolt to it's maximum clamping ability or they will back out. Get a good stretch gauge and proceed as I have suggested and you will have no issues with the bolts. There is a thread somewhere on here that discusses this same issue.

  10. #20
    meeper's Avatar
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    keep it simple. OEM hardware is always best...

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