Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 5.9QSB Jacket Cooler end plate gaskets

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  • April 2, 2021 at 4:49 am #112938

    Robert McManus
    Participant
    Vessel Name: Game Plan
    Engines: cummins qsb 5.9 380
    Location: Virginia Beach
    Country: USA

    Cummins, 5.9QSB Jacket Cooler end plate gaskets were gooey. They were not leaking externally.

    Installed 2 years ago (800 hours). Jacket Cooler appears to be mostly(95%) clear. Zinc replaced last year still about 90% intact.

    Opened after cooler on stbd engine after cooler, it was pretty salty on bottom(inlet) end tube sheet. Havenā€™t got to Port Engine aftercooler yet. Cooler bundle cleaned with “Barnacle Buster”

    Operating jacket temps on display panel have always ramped up slowly to normal and maintained T stat ~172F temp.

    Wasnā€™t sure if the condition of the gaskets was normal for age or were showing something is wrong.

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  • April 3, 2021 at 6:53 am #112967

    Robert McManus
    Participant
    Vessel Name: Game Plan
    Engines: cummins qsb 5.9 380
    Location: Virginia Beach
    Country: USA

    thanks for reply

    Old ones were from SB Mar and installed in Feb 2019. I ordered new ones from the SBMAR site a few days ago (SKU: HX-GK5KIT). I’ll plan on doing them with the zincs annually.

    As previously mentioned they weren’t leaking and performance was normal. I just wasn’t sure if I was having something weird going on. Thought the “Barnacle Buster” chem might have softened them up from the last time a circulated the cleaner in the engine.

    Thanks.

    April 2, 2021 at 6:48 pm #112960

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

    Not sure where yours came from, but for sure the ones we sell are genuine SENDURE and supposedly made from a GUM rubber compound.. Have I seen what you have just experienced over the years?

    100% yes, but maybe more over the last few years than a long time ago.. Luckily they are cheap and you should be dealing with your Heat x at least every 24 months anyway.. Common sense would tell me they were never designed to be reused regardless, just like basically every other gasket & O-ring on the engine…

    I am sure others here should be able to comment too.

    April 2, 2021 at 2:24 pm #112957

    Fireisland1
    Participant
    Vessel Name: Riverwind
    Engines: cummins QSB 380
    Location: long island n.y.
    Country: usa

    Iā€™m not fond of how the zinc blocks the tubes. I cut mine in half and change more often

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