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Continued failures

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  • Continued failures

    So I have my newly rebuilt Mercruiser installed and I'm feeling really good about it. Fires right up and am running to break in the cam as instructed by the builder. Bad metal noise, shut down. Go to start back up and find that flywheel bolts and damper bolts are sheared off. What, besides my luck, could have caused this? Only took 35 minutes to have the engine out. I'm getting good at that.
    1988 26' cuddy
    1975 20' open
    16' Sandpiper
    14' Certified Fiberglass

  • #2
    Besides a really big piece of metal stopping the forward motion of the engine, the best guess is a torque wrench that over torqued the bolts.
    Atlantic City, NJ
    1982 Cuddy, Rebuilt 351 .060 rings, Edelbrock carb

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    • #3
      The bolts could have been previously over torqued to the point of internal failure and when you installed them they only had a fraction of the original tensile strength. Years ago, I built engines and installed them. After a few broken pressure plate bolts, I insisted on new bolts for every flywheel and pressure plate installation and used ARP bolts when possible.
      Steve
      1998 260 Mackinaw Sea Maxx 5.7 HO TBI 12' Klamath w/ 20hp Tohatsu EFI

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      • #4
        Good points, I may be the guilty over torque guy.
        1988 26' cuddy
        1975 20' open
        16' Sandpiper
        14' Certified Fiberglass

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        • #5
          If they torqued for grade 8 bolts but used a lesser grade fastener then they would be over torqued. I always use locktite on flywheels and couplings bolts, not a lubricant. If never seize, moly lube, or oil was used then that affects the torque setting as well.
          '78 20ft Cuddy
          Mercruiser 350 FWC preVortec w/Carb

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          • #6
            Thanks ED. More things I did wrong.
            1988 26' cuddy
            1975 20' open
            16' Sandpiper
            14' Certified Fiberglass

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            • #7
              No more than two Agga Duggas on the impact gun!
              Just wishin', and hopen', and dreamin'

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