Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › ENGINE HESITATES AT 1500 RPM

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  • March 1, 2020 at 4:43 pm #94168

    victor brunst
    Participant
    Vessel Name: CHRISTINA
    Engines: 450 CUMMINS MARINE DIESELS
    Location: CLEARWATER FL
    Country: USA

    HAVE 2004 TIARA 36 SOVRAN WITH TWIN 450S DIESELS. PORT ENGINE HESITATES AT 1500 BEFORE GOING TO FULL POWER PARTICULARLY AFTER SITTING AT THE DOCK FOR A COUPLE OF WEEKS. REBUILD LIFT PUMP WHICH HELPED FOR SHORT PERIOD. JUST USEDS BOAT FOR FIRST TIME IN THREE MONTHS AND PORT ENGINE TOOK QUITE A LONG TIME TO GET TO OPERATING RPM OF 2100 RPM. THANKS FOR ANY IDEAS.

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  • March 2, 2020 at 3:57 pm #94249

    victor brunst
    Participant
    Vessel Name: CHRISTINA
    Engines: 450 CUMMINS MARINE DIESELS
    Location: CLEARWATER FL
    Country: USA

    no smoke black or otherwise. max rpm is 2600-2650.vb

    March 1, 2020 at 6:59 pm #94171

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

    Be accurate in your answers..

    1) During the hesitation period, is there any black or dark smoke coming from the exhausts behind the boat?

    2) When up on plane and you are at 100% throttle, what is you maximum RPM?

    3) Post good picture of your engines from all angle & perspectives..

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