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Replacing your water pump/impeller for your boat

Discussion in 'Boating & Fishing' started by genxer36, Jul 8, 2009.

  1. Jul 8, 2009 at 1:12 AM
    #1
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    I replaced mine a couple of years ago without any idea how to do it(below are links on step by step instructions). It took me about 2 hours & was easy. When they say water pump, really all you are replacing is the impeller (& replace the seals if needed). The impeller on the left is bad. The one on the right is how it should look.


    [​IMG]

    I will replace mine at the end of the summer. It is good to replace it every few years or so. I figured since we talk about repairing our trucks. We needed this write up for our boats also. You can save hundreds of $$$ doing it yourself. I think it cost me about $20-$30 for an impeller last time.

    Mercury:

    http://www.bassboatcentral.com/sttips.htm

    Evinrude & Johnson:
    http://www.bassboatcentral.com/johnrudetips.htm



    Mercury Video:
    http://www.youtube.com/watch?v=E-uzQi7IgwU
     
  2. Jul 8, 2009 at 6:34 AM
    #2
    lsocoee

    lsocoee My hair is all natural Staff Member

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    stuckified. Thanks Sean.
     
  3. Jul 8, 2009 at 6:43 AM
    #3
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    Awsome info!!!
     
  4. Jul 8, 2009 at 3:39 PM
    #4
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    It is easy to do, even for a noob.
     
  5. Jul 8, 2009 at 3:39 PM
    #5
    chris4x4

    chris4x4 With sufficient thrust, pigs fly just fine. Staff Member

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    LMAO! I need to do this to mine. :eek:
     
  6. Sep 3, 2009 at 6:26 PM
    #6
    wildjerseyfirefighter

    wildjerseyfirefighter I sell fishing and fishing accessories

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    stock, for now
    ill probably order one for my motor this winter seeing as the last time i did it, was well over 4 years ago, and the boat has sat winterized for 3 years
     
  7. Sep 6, 2009 at 4:58 PM
    #7
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    Probably wouldn't hurt. I plan on changing mine after fall fishing.
     
  8. Dec 26, 2009 at 12:12 AM
    #8
    DionysiosA76

    DionysiosA76 Captain Analyzer

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    We have twin 2stroke 8v71TA Detroit Diesel's (VERY dirty, noisy, but simple as hell engines) in our 37' Mainship that are equipped with Sherwood water pumps that on average require replacement every 10-15 running hours. Needless to say we have the sherwood guy on our speed dial :D
     
  9. Dec 26, 2009 at 4:35 AM
    #9
    Taco John

    Taco John Well-Known Member

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    I do mine every 2-3 years and replace the t-stat and pop off valve at the same time. The parts aren't that expensive, it is pretty easy to do and I don't want to have to come home on trolling motor or worse, paddle!
     
  10. Mar 29, 2010 at 4:42 PM
    #10
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    What is the t-stat & pop off valve? Pics would help. Thanks
     
  11. Mar 29, 2010 at 5:05 PM
    #11
    Taco John

    Taco John Well-Known Member

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    Thermostat and pop off (poppet). On my merc, they are in the engine block under a cast cap with a few bolts. Much like replacing the t-stat in a car but easier to get to :)

    Tbe attachment is a snap from the merc parts page - the poppet is 39, the t-stat 44, etc. i replace 38- 47 with the exception of 45 and 46. Not that expensive and after 8 years in the hard water around here, worth the piece of mind.

    Capture.PNG
     
  12. Mar 29, 2010 at 5:50 PM
    #12
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    That looks a little beyond my capabilities. I have a 1991 175 Mercury. I can do some things. But when comes to inside the engine I'm gun shy.
     
  13. Mar 29, 2010 at 5:51 PM
    #13
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    Wow! 10-15hours? That would get expensive.
     
  14. Mar 29, 2010 at 5:57 PM
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    duckcmdr

    duckcmdr If it flies it dies!!

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    Done it a few times on my Johnson 30...not a bad job when the motor was newer, now its hard to get the lower unit off without issues. I got a good shop buy me to take care of that motor.
     
  15. Mar 29, 2010 at 6:54 PM
    #15
    genxer36

    genxer36 [OP] Lord of Tomfoolery

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    I have a Bass Pro near me. Their service dept is top notch! I have had repairs done where they quoted me one price, but when the work was completed they have always come in way under the quoted price.
     
  16. Jun 12, 2014 at 5:46 AM
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    jethro

    jethro Master Baiter

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    Around here the BPS boat department is a joke. I wouldn't trust them to change a prop.
     
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