Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › QSB 5.9 oil drain line fitting size

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  • May 24, 2022 at 8:56 pm #132127

    David Henderson
    Participant
    Vessel Name: Seas the Day (for now)
    Engines: Cummins QSB 5.9 380
    Location: Chicago

    Been searching but I don’t see a clear answer. I’m trying to connect to the standard blue oil drain line but am unsure the fitting size and thread type. Can someone answer?   thanks

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  • June 2, 2022 at 12:43 pm #132519

    David Henderson
    Participant
    Vessel Name: Seas the Day (for now)
    Engines: Cummins QSB 5.9 380
    Location: Chicago

    Nope, but I found it now

    That wasn’t it. The right answer is 1/2″ NPT.

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    Rob Schepis
    May 26, 2022 at 8:26 pm #132233

    David Henderson
    Participant
    Vessel Name: Seas the Day (for now)
    Engines: Cummins QSB 5.9 380
    Location: Chicago

    Think I found it

    May have finally hit on the right search for an answer (link below) which is a JIC 6 flare. I have a fitting coming and I’ll verify and post back.

    6BTA Oil pan and fitting threads ID.

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