Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › Belt/Pulley squeal help

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  • October 14, 2018 at 8:57 pm #38437

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    We get this squeal after the boat sits for a week or so. Any ideas? Thanks.

    Qsb 5.9’s
    1300 hrs

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Viewing 10 replies - 1 through 10 (of 10 total)
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  • October 16, 2018 at 8:00 pm #38567

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    Belt was loose. Fired her up and no squeal. Stuffed my head in front of the engines and noticed both belt tensioners had a little noise coming from them. Hit the, with some lubricant and now things sound right.

    One some point both the seawater pumps leaked as both mounts below the pumps are not looking great.

    Thanks for the info.

    Mike

    October 16, 2018 at 3:03 pm #38547

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    Great info. Heading down there now and will take a look.

    October 16, 2018 at 12:03 pm #38535

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

    Good eye Tony, I was focused on all other pulleys and spinning things..

    October 16, 2018 at 5:58 am #38520

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

    Just looked at the video — Your seawater pump is stuck.. Chances are it’s been leaking saltwater thru the water seal for sometime and the bearings are done.. Plus the belt may need tightening, but that would be a band-aid at this time and not fix the parent issue. You need to inspect it all properly

    Tony

    October 16, 2018 at 5:50 am #38519

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

    You have 2 “water pumps” Specify SEAWATER pump or coolant pump–

    For sure, I have seen the seawater pump stuck.. I have never seen the fan hub bearing “stick solid”, just fail.

    Tony

    October 16, 2018 at 3:23 am #38516

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

    Mike call the shop and speak to Kevin – he is the lord of the parts. Or [email protected]

    October 15, 2018 at 6:21 pm #38509

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    Tony/SB team

    These in stock?

    Thanks.

    October 15, 2018 at 11:58 am #38489

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    I have now. Guess that’s high on the list. Mike

    October 15, 2018 at 3:23 am #38444

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

    QSB Screaming Fan Hub Bearing Failure

    Mike have you seen this?:

    https://www.sbmar.com/articles/qsb-screaming-fan-hub-bearing-failure/

    October 14, 2018 at 9:02 pm #38439

    Mike Mason
    Participant
    Engines: Qsb 5.9 380
    Location: San Diego
    Country: Us

    Just watched this and you can see the water pump belt not spinning at start up.

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