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Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Goodysnap, May 14, 2020.

Page 71 of 71
  1. Apr 18, 2026 at 11:40 AM #701
    Goodysnap

    Goodysnap Road Train Member

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    I have seen so many failures after a repair with Cummins connecting rods that I now change all rod cap bolts with new whenever they are apart.

    Are all the other bolts on that rod cap tighted to spec? Since this is a signature 600 I’m guessing this is a machined rod and not fractured split?

    I would inspect the rod and cap surfaces for fretting. If everything looks ok. Replace all the bolts and torque. Make sure the cap orientation is correct. Both numbers on the same side.
     
    Goodysnap, Apr 18, 2026 at 11:40 AM
    Goodysnap, Apr 18, 2026 at 11:40 AM
    #701
    Feedman, W923 and Dale thompson Thank this.
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  3. Apr 18, 2026 at 3:15 PM #702
    W923

    W923 Road Train Member

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    I believe it had bearings around 300k ago
    Yes they are machined caps on this one and appear to have been Cummins reman rods at some point
    Surprisingly the mating surface was fine and it plastigauged ok with the old bearing but I don’t believe it had much run time with the bolt broken since it cracked the block and caused a big oil leak
    I did mark the bolts before removal and put them back in the same hole…..they came out very close to the same rotational position as before I removed them so I would say they must have been close.
    I am replacing all of the bolts in all 6 rods at this point.
     
    W923, Apr 18, 2026 at 3:15 PM
    W923, Apr 18, 2026 at 3:15 PM
    #702
    Dale thompson and Feedman Thank this.
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    • Page 71 of 71