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Port side pump issue

Discussion in '2016 Yamaha Boats' started by Chip F., May 4, 2018.

  1. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    First a little history.. last fall both my pumps were pulled by the dealer in order to repair several gel coat cracks around the mounting bolts of both along with gel coat cracks at my rudder attachments.

    Tonight I took the boat out for testing and discovered severe cavitation on the port side as I increased the throttle to it and then the RPMs pegged. If I babied the throttle I was able to get the boat up on plane . I checked the clean out plugs and reseated both but I know that both were seated properly.

    I came home and looked at a couple threads on the issue and what I’ve concluded is that the impeller clearance by eyeball looks tight but I did not put a feeler gauge in there. It looks like the tunnel has gaps and that’s what I think the issue is. Looking for experienced opinions. Here are some photos:
    186DC5F5-FFCF-4DF4-83A8-445DDC4171A9.jpeg
     
    Last edited: May 4, 2018
  2. Scottintexas

    Scottintexas Jetboaters Captain

    Messages:
    2,880
    Location:
    Corinth, TX (DFW)
    Ratings:
    +1,849 / 43
    Boat Make:
    Yamaha
    Year:
    2007
    Boat Model:
    AR
    Boat Length:
    23
    if you could edit your photo and circle where you think the gaps are, I'm sorry I'm having a hard time seeing them,

    What exactly did the dealer remove, nozzles/impeller or intake grates or transom plate?

    My cavitation was caused by loose/missing silicone in the intake grate/tunnel area, we also had another member that had to remove his transom plate twice to correct an air intrusion, if I remember correctly,
     
  3. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    It looks like everything was removed by looking at all the new sealant
     
  4. Scottintexas

    Scottintexas Jetboaters Captain

    Messages:
    2,880
    Location:
    Corinth, TX (DFW)
    Ratings:
    +1,849 / 43
    Boat Make:
    Yamaha
    Year:
    2007
    Boat Model:
    AR
    Boat Length:
    23
    • Like Like x 1
  5. swatski

    swatski Jetboaters Fleet Admiral

    Messages:
    7,553
    Location:
    Saint Louis, MO
    Ratings:
    +8,117 / 122
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    AR
    Boat Length:
    24
    Looks like your impeller is fine, it must be the missing sealant - sounds like you are sucking air out of control!

    I would pull the pumps and port/blueprint/seal the tunnels.

    --
     
  6. Ronnie

    Ronnie Jetboaters Admiral

    Messages:
    4,692
    Location:
    SF Bay Area
    Ratings:
    +3,577 / 62
    Boat Make:
    Yamaha
    Year:
    2010
    Boat Model:
    Limited S
    Boat Length:
    24
    I think that you should smooth that transition out with 3m 4200 or 5200, a razor blade and some painters tape. Also find someone else to work on your boat. Imho your dealer caused the problem or more of one.
     
  7. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    I'll pull the pump and check things out and smooth it out. The dealer is almost 3 hrs away. Is the 4200 preferred over the 5200? The boat ran fine prior to the dealer pulling the pumps for the crack repairs. Does anyone know what the black sealant might be that is on there now? Thanks for the input and help.
     
  8. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    Well I tried to pull it but there is this black gasket material between the pump housing and wear ring and then between the wear ring ang transom plate nothing will budge...
    I found the work order for it and it is black 5200.
    Should there even be sealent between these?
    I thought wasit 4 bolts and pull.


    95315CA1-2CF2-4CDF-8B81-C68ACACF7621.jpeg
    DA7667B3-492D-4CF7-A14F-C7BFB4C5B293.jpeg
     
    Last edited: May 5, 2018
  9. Sbrown

    Sbrown Jet Boat Addict

    Messages:
    561
    Location:
    Easton, Pa
    Ratings:
    +628 / 2
    Boat Make:
    Yamaha
    Year:
    2017
    Boat Model:
    AR
    Boat Length:
    24
    At least you found out where the missing sealant went.......
     
  10. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    Yea it's everywhere they even used my trailer to wipe their fingers off!
     
  11. bronze_10

    bronze_10 Jetboaters Admiral

    Messages:
    3,840
    Location:
    Raleigh / Wake Forest Area..
    Ratings:
    +3,667 / 68
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    SX
    Boat Length:
    23
    Uhhhh,, they put the pumps back together with 5200?!? !??! That's a 1 hour drive to a the dealer that's 3 hours away and show my ass when I get there problem!
     
  12. Chip F.

    Chip F. Jet Boat Addict

    Messages:
    179
    Location:
    Schuylkill Haven, PA
    Ratings:
    +143 / 5
    Boat Make:
    Yamaha
    Year:
    2016
    Boat Model:
    SX
    Boat Length:
    24
    Yea and it's both pumps put together that way!
     
  13. bronze_10

    bronze_10 Jetboaters Admiral

    Messages:
    3,840
    Location:
    Raleigh / Wake Forest Area..
    Ratings:
    +3,667 / 68
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    SX
    Boat Length:
    23
    Someone told the mechanics to make sure the pumps are sealed and the idiot sealed the actual pump assembly with 5200 instead of the tunnel...
     
    • Agree Agree x 1
  14. bronze_10

    bronze_10 Jetboaters Admiral

    Messages:
    3,840
    Location:
    Raleigh / Wake Forest Area..
    Ratings:
    +3,667 / 68
    Boat Make:
    Yamaha
    Year:
    2008
    Boat Model:
    SX
    Boat Length:
    23
    Is your boat still under warrant?
     
  15. Cobra Jet Steering LLC

    Cobra Jet Steering LLC Jetboaters Admiral

    Messages:
    2,953
    Location:
    Florida
    Ratings:
    +2,708 / 55
    Boat Make:
    Yamaha
    Year:
    2014
    Boat Model:
    Other
    Boat Length:
    Other
    You may want to send all this info to Yamaha including the finger prints on the trailer.
     
    • Agree Agree x 3

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