Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Plastic shredding

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  • October 3, 2022 at 12:55 pm #137502

    BAL
    Participant
    Engines: 6BTA5.9-M3 330

    6BTDA, 330s, cpl 1975. Found soft plastic pieces in bilge under fan belt, and some nestled under pulley.<br />Can’t trace the source, pulleys all spin freely. Need help figuring where they came from and what to do. Also, can I run the engine at lower rpm (1,000) to warm it up for an oil change while I sort this out? Thanks much,  Bruce

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  • October 5, 2022 at 1:39 pm #137576

    Rob Schepis
    Forum Moderator
    Vessel Name: Tenacious
    Engines: 6BTA 5.9 330's - "Seaboard Style"
    Location: Long Island, NY
    Country: USA

    Yup, good to change them out proactively..

    October 5, 2022 at 1:13 pm #137571

    BAL
    Participant
    Engines: 6BTA5.9-M3 330

    Here’s where plastic pieces are coming from on a failing belt tensioner.  Stbd shim is missing and port is breaking up. Happened around 1900 hours fwiw.

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    Rob Schepis
    October 3, 2022 at 5:08 pm #137511

    BAL
    Participant
    Engines: 6BTA5.9-M3 330

    Thx, did some digging and it does look as though a shim in the belt tensioner has failed.  Only bad news is that the tensioner comes as a unit so it’s not possible to replace just the shim. 

    Regarding engine warmup, I should have been more specific.  I always do the warm up under light load, so no problem. Just wasn’t sure if I should risk running the engine with the tensioner problem. I’ll hold off the oil change until everything is fixed.

    October 3, 2022 at 3:02 pm #137508

    Clark Leighs
    Participant

    I think it is from the tensioner.  Look up the problem in Tony’s tips. You are not the first.

     

    As for oil warmup I think you will find the oil does not warm up.   Certainly not very quickly.   I tried that years ago on my different engine and after about 40  min to an hour the oil was still cold. Sure a bit warmer but basically cold.   

    I take it out for a run so there is a decent load on it.

     

     

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