Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 1998 Cummins 5.9 330hp Valve Cover Bolt Torque

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  • July 16, 2023 at 9:32 am #151654

    Edward Shaughnessy
    Participant

    Original maintenance book calls for 18 ft-lb for the cover bolt using the original obsolete 3923406 noise isolator seal. With that seal, the bolt will bottom on a shoulder as you tighten it and not crush the valve cover gasket. The replacement isolator 3935449 is much thicker, before I tighten these too much and completely crush the new valve cover gaskets, can someone please advise me on how much to tighten the cover bolt?

    Thank you!

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  • July 26, 2023 at 10:03 am #152199

    Daniel
    Participant
    Vessel Name: Cloud Nine
    Engines: Cummins 6BTA M3
    Location: Vancouver
    Country: Canada

    Perfect, thanks. Done and yes till it bottoms out which is also at 18ft lb

    July 19, 2023 at 6:45 pm #151859

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

    On YOUR particular design, you tighen it until the bolt bottoms on the shoulder..The valve cover gasket will compress as needed.

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    Edward Shaughnessy
    July 19, 2023 at 7:45 am #151824

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

    One of those things you do by feel and be sure all surfaces are 100% clean and the base gaskets are seated properly.

    1 user thanked author for this post.
    Edward Shaughnessy
    July 18, 2023 at 6:01 pm #151799

    Daniel
    Participant
    Vessel Name: Cloud Nine
    Engines: Cummins 6BTA M3
    Location: Vancouver
    Country: Canada

    .

    I doing the same servicing, would be great to know what the torque is?

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