Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › QSB 5.9 SMX Raw Water pump

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  • November 17, 2017 at 7:55 pm #25325

    Marc Smoorenburg
    Participant
    Vessel Name: L'Attitude25*
    Engines: CumminsQSB 5.9 480 hp
    Location: Rosslyn Bay, Queensland,
    Country: Australia

    Hi Guys,
    I recently purchased a pair of SMX Raw water pumps for my Cummins QSB 5.9 engines..
    The removal & fitting of the new pumps was 100% plug n play, but I reused the ‘old’ Sherwood elbows..
    My question is, are there any advantages to purchasing a new set of the SMX elbows?
    Are they a better seal, or stronger in any way?
    Thanks.

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  • November 19, 2017 at 7:33 am #25368

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

    Marc,

    One more thing…looking at the bigger picture, are you up on your maintenance of the seawater components and sure that all seawater passages are all clear, hence no back pressures. Here’s an example of HIGH back pressure. I took this “bulging hose” pic surveying a Tiara with 6BTA 370’s that were reportedly “meticulously maintained”. Unreal..but par for the course

    November 18, 2017 at 3:52 pm #25353

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

    As Bill stated, zero issues staying with Sherwood elbows. Let us know how you make outā€¦

    November 18, 2017 at 3:31 pm #25352

    Marc Smoorenburg
    Participant
    Vessel Name: L'Attitude25*
    Engines: CumminsQSB 5.9 480 hp
    Location: Rosslyn Bay, Queensland,
    Country: Australia

    Hi Rob,
    Yes I did change to the supplied SMX O rings but developed a small leak.
    I used a smear of grease, and have now replaced to the Sherwood I rings which are thinner.
    Tested ok at idle, but have not been out for a run.

    November 18, 2017 at 1:27 pm #25342

    Bill Desmarais
    Moderator
    Vessel Name: Extremist
    Engines: Cummins 6BTA 370
    Location: Portsmouth, NH
    Country: United States
    Marc Smoorenburg wrote:

    Hi Guys,
    I recently purchased a pair of SMX Raw water pumps for my Cummins QSB 5.9 engines..
    The removal & fitting of the new pumps was 100% plug n play, but I reused the ā€˜oldā€™ Sherwood elbows..
    My question is, are there any advantages to purchasing a new set of the SMX elbows?
    Are they a better seal, or stronger in any way?
    Thanks.

    Mark,

    I’ve upgraded to SMX pumps on four separate 6BTA 370s….Pretty sure I always used the flange elbows that were on the old Sherwoods. With a dab of Rectorseal #5 or other light sealant on the oring of course

    November 18, 2017 at 5:48 am #25330

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

    Did you use new orings, maybe a thin smear of grease? Any signs of an issue, flange leak? Or are you just asking in general?

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