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  • June 11, 2017 at 2:30 pm #19788

    Mike Pettee
    Participant
    Vessel Name: Cop-Out
    Engines: Cummins 370s
    Location: Big Pine Key, FL
    Country: USA

    ZF 220. Developing a chatter noise in neutral and idle forward. It does not do it in reverse. No loss of performance, and it does not appear to be slipping.

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  • June 11, 2017 at 7:20 pm #19798

    Mike Pettee
    Participant
    Vessel Name: Cop-Out
    Engines: Cummins 370s
    Location: Big Pine Key, FL
    Country: USA

    I have not noticed any other sounds at shutdown or otherwise.
    Both my engines seem to idle low (sub 550ish per tach, with the port engine being lower thab stbd.
    I usually bump them to 650 to 700 for my idle speed through the canal.
    At 660 to 700, the chatter is not existent.
    I will get in there and get pics the best i can.
    No dust or anything that i noticed.

    June 11, 2017 at 3:35 pm #19790

    Tony Athens
    Moderator
    Vessel Name: Local Banks
    Engines: QSB 6.7 550 HP
    Location: Oxnard, CA
    Country: USA

    MOST LIKELY, the Torsional coupling that connects the engine to the gear ( inside the bell housing where you cannot see it) has, or is, loosing it ability to absorb torsional issues.. Think of it as a shock absorber on your car , but when it finally gets real bad, it may or will fail and leave to stranded………….Noticed anything else (funny noise) when you shut down or any unusual dust/particles in the engine room near the gear?

    Maybe post some good pics of all?

    Tony

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