260DA 6.2 overheating

Discussion in 'Gas Engines/Drives/Transmissions/Props' started by Happy Dayz, Nov 22, 2017.

  1. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    In post #6, his pump looks shot, wear plate on the cover isn't going to fix the wear on the pump body that's clearly visible.
     
  2. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    i will replace the pump but it too was replaced not so long ago.. dont see the wear you describe. otherwise no deviation in shaft from bearings, appeared to be in goo shape...

    [​IMG]
     
  3. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Looks like score marks to me, but your closer to it than I am.
    Do that water volume test that Lazy suggested. It's all about water in and water out. But your low psi numbers suggest intake side.
     
  4. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
  5. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
  6. Boater420

    Boater420 Well-Known Member

    Mar 11, 2015
    Clearwater, FL
    '97 330 Sundancer
    V-Drives
    Westerbeke 4.5BCG
    Twin Merc 454's
    I had my friends at Quantico enhance the digital image to clearly show what I believe is scoring. There is also a picture of the new pump body for comparison.
     

    Attached Files:

  7. joeyleggz

    joeyleggz Member

    324
    Jan 15, 2013
    long island
    current boat: 1997 sea ray 330 express cruiser
    twin 454's efi

    That’s some damn fine enhancement “bravo”!!! No pun intended
     
  8. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    thats some good stuff ya got there 420... yes i saw that scoring but it is nominal. the heavier scored "other" side...when replaced provided no change in psi.. hard to believe that bit of scoring is causing low psi or flow by short circuiting... but im open to any ideas.. not going to replace that expensive part yet, its not that old...

    as i understand... generally blockage will create a high pressure on the pump side, low on the opposite..
     
  9. Espos4

    Espos4 Active Member

    559
    Jan 1, 2017
    Long Island NY
    2007 240 Sundeck
    350 MAG Bravo 3 W/DTS
    True, but what if your blockage is after the raw water pump and before the pressure sensor.......

    You will have low pressure readings.

    Low readings don’t always mean the blockage is before the pump.

    Just means the blockage is before the pressure sensor.
     
  10. Lazy Daze

    Lazy Daze Well-Known Member TECHNICAL Contributor

    Apr 21, 2009
    PA
    Various
    Various
    Agree - looks like scoring. If you can feel it with your fingernail, it's too much. From the pictures, it looks like too much.
     
  11. EddieGuidry30

    EddieGuidry30 New Member

    17
    Jul 20, 2017
    Newport News, Va
    2005 Sea Ray Sundancer 280
    Twin 5.0MPI
    I just had the same issue on my 2005 280 bravo III’s and I found a blade from an old impeller from the PO after the raw water pump ... it was inside the little 3 way fitting that the raw water pump hose connects to that also runs up to the power steering cooler
     
  12. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's

    Any updates?
     
  13. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Bump
     
  14. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    good morning...

    i have not had the chance to do the pump test (i trailer the boat and prefer to test in water, cant stop enjoying the boat to do so) and have not flushed with barnacle buster (or the like). last weekend out, only traveled at idle speed in the Homosassa River in FL. ....even with long 1000 rpm rides she stays at 156-158 with the 140 thermo...

    going to try Sunday for pump flow test...
     
  15. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    didt get to do the pump testing this past weekend... but...
    the pump may be close to bearing failure, upon inspecting while running, potentially it was making noise and appeared to look like it was not smoothly rotating..?
    decided F it and ordered a new raw pump... will get Friday and report from weekend..
     
    joeyleggz likes this.
  16. techmitch

    techmitch Well-Known Member SILVER Sponsor

    May 1, 2008
    Chesapeake Bay, Middle River/Frog Mortar Creek MD.
    1999 270 DA
    Twin 4.3s W/Alpa I Gen II's
    Standing by.
     
  17. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    is there a special tool to remove pulley from shaft? Harbor Freight, or where can i find... thank you!
    [​IMG]
     
  18. scoflaw

    scoflaw Well-Known Member

    Aug 10, 2011
    cape cod mass
    1999 Powerquest legend 260 sx
    502 mpi Bravo 1
    Borrow that tool from Autozone...no charge
     
  19. Bt Doctur

    Bt Doctur Well-Known Member

    Aug 21, 2010
    New Jersey
    Ex SRV 240 Weekender twin
    in between
    a standard power steering pully remover/installer tool
     
  20. Happy Dayz

    Happy Dayz Active Member

    386
    Jun 26, 2017
    Sarasota, FL
    '06 260 Sundancer, 6.2, BIII, Kohler 5kw
    79' classic Kona Family Cruiser jet boat..
    6.2 w/ BIII, 502 w/ Berkekley
    i got it from Autozone!! thanks guys... im about to replace... in the water tomorrow
     
    joeyleggz likes this.

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