Tutorial on water pump installation.

Discussion in 'Bubba's Outboards' started by Bubbakat, Oct 5, 2006.

  1. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    Water pump change on a 25 H/P early nineties model.
    Pictures done By Bobpaul

    You remove the plate to gain access to the shift connector.

    http://img.photobucket.com/albums/v172/coofficer/000_08241.jpg


    This is what you will see

    http://img.photobucket.com/albums/v172/coofficer/000_08252.jpg


    you can the separate the shift shaft

    http://img.photobucket.com/albums/v172/coofficer/000_08263.jpg

    http://img.photobucket.com/albums/v172/coofficer/000_08274.jpg

    http://img.photobucket.com/albums/v172/coofficer/000_08285.jpg


    After doing the above you can then remove the bolts that hold the lower unit on
    there should be two on each side and one under the trim tab. Remove the trim tab to access the hidden
    bolt.

    http://img.photobucket.com/albums/v172/coofficer/Boltstoremove-1.jpg

    You will find this bolted to the lower unit with the drive shaft running up through it.

    http://img.photobucket.com/albums/v172/coofficer/pumpandshaft.jpg

    http://img.photobucket.com/albums/v172/coofficer/Cuptop.jpg

    Under the above cup you will find the impeller.

    http://img.photobucket.com/albums/v172/coofficer/impeller.jpg

    Under all that is the wear plate and the lower unit water intake cavity. You need to clean all the surface and
    inside the intake real good. This one has been in salt water so you can see the damage it can cause if left alone.
    On this model and keep in mind not all models are alike this shaft can be removed from the gear box and reinserted

    http://img.photobucket.com/albums/v172/coofficer/Thisdriveshaftcanberemoved.jpg

    Alright we have it cleaned out so lets replace it shall we.
    Install the new plate and gasket under it and use some brush on sealer that will most likely be brown in color

    http://img.photobucket.com/albums/v172/coofficer/Newwearplateandgasket.jpg

    Here is the new cup. notice the sealer to hold the gasket in place and to seal it.

    http://img.photobucket.com/albums/v172/coofficer/Cuptop.jpg

    On these models, I think from the early eighties they Incorporated a metal like ring with a flat metal cap.
    If you will look in the outer cup you will see where the round metal plate fits into the cup. The plate has a small tab that sets inside a slot in the cup. The metal ring is then squeezed together
    not real hard now and inserted into the cup.
    It has two notches that go in first and lined up with the notches in the round plate

    .http://img.photobucket.com/albums/v172/coofficer/Cuptop.jpg

    http://img.photobucket.com/albums/v172/coofficer/Housingcupinsidethepumptop.jpg


    Grease the impeller up and insert it into the cup and metal ring while twisting clockwise.
    http://img.photobucket.com/albums/v172/coofficer/impellergreased.jpg


    If you will notice the white thing in the picture this is what holds the impeller in place while it is on the drive shaft.
    You can take a little sealer to help hold it in place while you slide the impeller down on it.

    http://img.photobucket.com/albums/v172/coofficer/plate.jpg


    Bolt your housing back down and install your new grommet

    http://img.photobucket.com/albums/v172/coofficer/newgrommentinpumphousing.jpg

    Add a little grease to the splines on the upper end of the shaft and the new O ring and reinstall your
    lower unit. Don't put grease on top of the drive shaft it can cause the shaft to preload the crank and do internal damage to
    the engine.

    http://img.photobucket.com/albums/v172/coofficer/newgrommentinpumphousing.jpg

    Reinstall your bolts and hook up your shift shaft and you should be ready to rock and roll

    http://img.photobucket.com/albums/v172/coofficer/reinstallingshiftconnecter.jpg
    http://img.photobucket.com/albums/v172/coofficer/Boltstoremove-2.jpg

    Now Guys and gals use common sense when doing this. Don't force nothing and use a digital camera if you have one.

    If you have any questions ask BobPaul because I have no earthly idea how to do this. (grin):big_smile:

    I hope I didn't miss anything in this.:embarassed:
     
  2. savage308

    savage308 New Member

    Messages:
    399
    State:
    Victoria, Texas
    Great post fellas.... I've done a couple of these on 35hp models but I have yet to do one on my new motor. 115 evinrude saltwater series. Should it be about the same? Again thanks for a great How To post.
     

  3. Memphis_Catfish_King

    Memphis_Catfish_King New Member

    Messages:
    435
    State:
    Memphis,TN
  4. SeedTick

    SeedTick New Member

    Messages:
    1,414
    State:
    Conway Arkansas
    Thank you Gentlemen! I think I might even be able to do now. Uh oh, that's sounds scary.:embarassed: This is definitely Library quality material.

    st
     
  5. fish

    fish Active Member

    Messages:
    1,573
    State:
    ChattanoogaTenn
    Thanks a bunch Bubba and Bobpaul, that is some great information. Bubba, is this basically the same way I need to do on my 50HP Nissan? Do I need to get an impeller kit or is there such a thing, or do I need to ask for all the different parts that you have listed? Full of questions among other things ain't I.LOL But I plan to jump dead in the middle of it here in the next few days. Thanks again for this tutorial. And Seedtick, you are right, this needs to be in the library.
     
  6. Bobpaul

    Bobpaul New Member

    Messages:
    3,039
    State:
    Supply NC
    Your shift shaft will disconnect totally different. There's a hair pin like thingy you'll pull loose from the shift mechanism. It'll be low and to the rear of the right side bottom carb. Once you get it out, push the rod it goes through to release the pin that goes through the shift shaft

    If you disconnect the shift control cable, it'll make life easier. Once the shift is disconnected, remove the bolts, don't forget the one under the trim tab, and lower your lower unit.
     
  7. Bobpaul

    Bobpaul New Member

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    3,039
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    Bubba, you did a fantastic job of explaining the pictures and replacement proceedures.

    I still think we need to open a BBQ joint:big_smile: .
     
  8. Bobpaul

    Bobpaul New Member

    Messages:
    3,039
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    Supply NC

    Jim, I did a 40 hp Nissan a few days ago and the shift shaft in it realeased different from any other engine I ever did. Look at yours and see if it's like I'll explain.

    Low on the mid section of this Nissan is a coupler that's visible on the shift shaft. It's held together by a top and bottom drift pin. I drove out the upper drift pin and it seporated when I lowerered the lower unit.

    When I got to the water pump, I removed the 2 of the bolts holding it in place, and loosened the other 2. This was to keep the base that the pump sits on in place while I loosend and seporated the pump housing, I used a putty knife about the size you'd use as a chisel for carving out a door for a strike plate. Once you get the Housing loose, remove all bolts and remove the housing. Replace 2 of the bolts in the base again, and finish taking off the water pump base plate.

    I had one heck of a time getting the old metal cup out of the pump housing. With a small punch, I curled opposite sides of the cup inward so I could put 2 screw drivers on opposite sides and pry it out. Pics will come later today of this cup and impellor. You ain't ever seen such a mess.

    Jim, this is what I did for a 40 hp Nissan. I have no idea what yours looks like:lol:
     
  9. Bobpaul

    Bobpaul New Member

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    Just thought I'd mention the adhesive I use for those waterpump housing thin rubber gaskets.

    It's widshield gasket adhesive, and that's the first thing I do when I open a new water pump kit, install the gasket so it'll be ready when I put it over the impellor.
     
  10. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    I am going to try to compile some pictures of the location of the shift shat disconnects to add to this.


    Jim to answer your question on your motor. I have never been into a Nissan so it will be a first for me. I will come across the mountain and bring my camera and we will tear it down. Jim I don't know when the last time a complete water pump was installed in your motor so a good start would be is to change out the complete water pump.


    Bob Thanks for thr kind words on this.
     
  11. fish

    fish Active Member

    Messages:
    1,573
    State:
    ChattanoogaTenn
    Bob, if you had problems with the water pump on a Nissan, I am in for it. I am not going to even think about touching it until Willard gets here.

    Willard, I really do appreciate you coming all the way over here to help me out. I will go ahead and get the complete water pump and housing. I have had this motor for 9 years, I think, and it has never had a new pump or impeller so it must be a mess in there right now.

    I can't thank you both enough.
     
  12. 710split

    710split New Member

    Messages:
    31
    State:
    iowa
    Good topic.
    Good coverage of topic.
    Beside learning what's involved in changing a water pump,
    I also learned of an excellent way to present a step-by-step
    set of instructions and coordinate with pictures.
    Thank-you!!
     
  13. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    Glad it could help Dan. That is what it was intended to do and if any one sees a way for one of these to be more informative then by all means pleas add your input.
     
  14. badkarma

    badkarma New Member

    Messages:
    772
    State:
    Oxford,Miss
    Bubba THANKS!!!! I just ask Bob how to undo the shifter on a 1993 25hp Johnson and it looks like you just gave me the answer.I will let you both know if I can do it tomorrow night.

    P.S. I pulled wrinches for a living all my life but because my spine is messed up my hands don't work to good any more so I have problems doing machinc work.
     
  15. Bobpaul

    Bobpaul New Member

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    Guys, the pictures of the shift coupler shows it 3 times. Look close and you'll see a little black plastic keeper on the bottom of the upper shaft when it's disconnected.

    That keeper needs to be removed and the upper coupler piece slid off the shaft when the lower unit is taken down.

    Don't loose that little keeper. It has a fine split in it so you can remove it. Look close to see it.
     
  16. badkarma

    badkarma New Member

    Messages:
    772
    State:
    Oxford,Miss
    Bubba thanks again!!!!!I got it broke down and that old impeller is as hard as a rock but it was still pumpin" some last time I had it in the water and I guess that ain't to bad for 13 years.I didn't get an impeller kit and now I have it apart I see I need a new gasket and a cup so I'm gona have to buy one.

    Bob thanks!!! I made that post to you about an hour before I found bubba's how to post.
     
  17. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    ^Bump--Bump ^ Up you go
     
  18. Bobpaul

    Bobpaul New Member

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    3,039
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    Cool, It's about time.:confused2:
     
  19. heavyduty

    heavyduty New Member

    Messages:
    450
    State:
    Grand Gulf,MS
    Thanks Bubba, been needing to change my water pump in my 96 30hp Evinrude. It has never been changed,I can tell it is weak at an idle.
    These instructions helped me out alot.

    Thanks to you and Bobpaul!
    Scott
     
  20. Bobpaul

    Bobpaul New Member

    Messages:
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    Now if the mods would only make it stay out front and move the carb thread like I asked up to the top, this place would really be some help.

    Seems like the only time anyone pays attention to me is when I have a post that has f---- in it:roll_eyes: