Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › QSB 5.9 carbon/soot on rockers

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  • May 19, 2020 at 5:20 am #97831

    dave carey
    Participant
    Vessel Name: Meridian
    Engines: 5.9 QSB
    Location: Cape Cod
    Country: USA

    I have twin QSB 5.9s. I removed the valve covers and inspected the rocker assemblies. The starboard engine was clean. The port engine rockers had a film of soot/carbon (easy to see on the red and yellow injector wiring).

    Any ideas why this would be the case? I am replacing all the Airsep filters as a precaution.

    Dave

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  • May 19, 2020 at 5:47 am #97832

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

    Change oil makes & be sure it meets Cummins specs, use genuine Cummins oil filters, and be sure you don’t extend oil change intervals.

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