Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › qsc cracked turbo x 2

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  • July 29, 2020 at 2:54 am #101534

    Luke Nelson
    Participant
    Vessel Name: Southern Image
    Engines: QSC 8.3 540hp
    Location: Perth
    Country: Western Australia

    Hi Guys,
    While doing some other work I noticed both my turbo housings are cracked, I am not sure if they leak yet but will do tomorrow.
    So both are cracked in the same place, I am not sure if it is new or came with the engines 2nd hand as I have never taken the heat shield off and had a good look. Anyone seen this before?

    Other than a new housing, would you drop the housing off the turbo and give it a weld ? Or just paint over it and see if it has movement?

    Thoughts ?

    thanks Luke

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  • August 15, 2020 at 10:49 am #102443

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

    Is it possible your exhaust is unsupported and causing too much load? The crack goes right through a bolt hole. Maybe weight plus vibration is causing it.

    August 15, 2020 at 2:45 am #102420

    Luke Nelson
    Participant
    Vessel Name: Southern Image
    Engines: QSC 8.3 540hp
    Location: Perth
    Country: Western Australia

    Pulled the turbo and stripped it a little. Its pretty rooted..

    July 30, 2020 at 4:47 pm #101624

    Luke Nelson
    Participant
    Vessel Name: Southern Image
    Engines: QSC 8.3 540hp
    Location: Perth
    Country: Western Australia

    Thanks Tony,

    In a way I was hoping you would say you have seen it.
    Yes they are 2006 540’s propped to below 490 to meet shaft survey limits.
    Pt aftercooler was done a month ago, stb is on the list for this week.

    Il try and get some better pics today.

    SN 46597834, 46909941

    About 5300hours on both.

    cheers Luke

    July 29, 2020 at 5:28 pm #101575

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

    QSC–Cracked Turbo housing

    Never seen one do this.. These are early engines based on what I see..

    Engine serial numbers?

    Total hours since new?

    Curious—-Got some GPH numbers at 1900–2300 RPM when cruising?

    Last time your aftercoolers were serviced on the bench per my protocol?

    Got some pics of the rest of the engines?

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