Cummins Marine Diesel Repower Specialists › Forums › Cummins Marine Engines › 5.9b 330hp bus heater install

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  • December 18, 2016 at 1:22 pm #13775

    Roger bing
    Participant
    Vessel Name: Bingo
    Engines: 330 b series
    Location: Freeport ny
    Country: Usa

    going to do install this week and am going to order fittings.. I looked at the pics of the taps on this site. Looks like the supply in the turbo blank on manifold  is 3/4″ pipe thread and the return by water pump suction is 1/2″ pipe .  Could someone confirm these pipe sizes? I don’t work with pipe a lot. Also the vent from the turbo blank to the exp. tank.  What pipe size is that?

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  • December 19, 2016 at 2:43 pm #13821

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

    Measuring NPT Sizes

    Further to Tony’s post above….Here is the chart I use:

    NPT dia chart

    And the caliper ($40 on Amazon Prime):

    caliper

    December 18, 2016 at 7:35 pm #13808

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

    Need to get a pair of simple calipers:

     

    1/2  NPT measures a tad under    7/8″ OD———- .840″
    3/4  NPT measures  a tad over  1″ OD——–1.050″

     

    Tony

     

    December 18, 2016 at 6:22 pm #13797

    Roger bing
    Participant
    Vessel Name: Bingo
    Engines: 330 b series
    Location: Freeport ny
    Country: Usa

    Tony:

    Thanks for pics.  Im pretty sure the plug in the water pump return line is 1/2″. However, the bushing that is currently in the turbo flange blank on top of the exh. manifold looks to be 3/4″.  Is that part of the blank 3/4″ npt?

    December 18, 2016 at 5:52 pm #13794

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

    Look at these pics..

     

    TonyB Water Heater connections (1)

    B Water Heater connections

     

    Heater Inlet Port

    December 18, 2016 at 5:25 pm #13790

    Roger bing
    Participant
    Vessel Name: Bingo
    Engines: 330 b series
    Location: Freeport ny
    Country: Usa

    I took screenshots off your site .. I didn’t Ny live near the boat.

    December 18, 2016 at 5:02 pm #13785

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

    Post good Pictures of the exact ports you are referring to..

     

    Tony

     

     

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