• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

25 hp merc water pump replacement question

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • 25 hp merc water pump replacement question

    I'm attempting to replace the water pump on my 1989? 25 hp merc. I'm not sure of the year...I can't find the serial number but it has A990202 stamped on the freeze plug. If anyone can identify the year based on cowling shape or color please let me know.

    These is what I've done:
    1) drained lower unit oil
    2) removed zinc plate but did not find any bolts to be removed under it.
    3) removed the 4 1/2" bolts holding the lower unit on.
    It only drops about an 1/2" and appears that the shifting rod is holding it and needs to be disconnected.

    Any help would be greatly appreciated!!!
    Thanks!
    Attached Files
    1989 WellCraft Classic 180
    Mercruiser 3.7L w/Alpha1 drive


    2001 Ranger R81 - Yamaha 175 HPDI


  • #2
    Re: 25 hp merc water pump replacement question

    Look under the port side of the carb there is a screw/clip to remove the rod from the shift lever.

    Comment



    • #3
      Re: 25 hp merc water pump replacement question

      I see the clip and screw.
      do yo back the screw all the way out?
      It looks like if you back the screw all the way out it will allow the clip to slide off the shift lever but still attached to rod. How does the clip come off the rod?

      thanks again for all your help.
      1989 WellCraft Classic 180
      Mercruiser 3.7L w/Alpha1 drive


      2001 Ranger R81 - Yamaha 175 HPDI

      Comment



      • #4
        Re: 25 hp merc water pump replacement question

        1986
        sigpic
        Nothing is so broken that Government can't make it worse.

        Comment



        • #5
          Re: 25 hp merc water pump replacement question

          Ok, I've got the lower unit off and the impeller out.
          But the impeller appears to be in good shape (all the ears are attached and not cracking or anything). I know the impeller has not been replaced in several years.

          The motor was not peeing with muffs on so I assumed the water pump was bad. Is there something else that could keep it from peeing? or something else that I should check/replace while I've got it broke down?

          I can blow air freely from the pee hole into the motor and can blow air on top of the water pump housing down freely.

          any ideas?
          thanks
          1989 WellCraft Classic 180
          Mercruiser 3.7L w/Alpha1 drive


          2001 Ranger R81 - Yamaha 175 HPDI

          Comment



          • #6
            Re: 25 hp merc water pump replacement question

            might be the housing, I've had a crack before that would not allow the pump to pump very well.

            Comment



            • #7
              Re: 25 hp merc water pump replacement question

              Follow up: I got everything back together and it's pumping water!
              Important note to remember for the novice like my self is that this motor has a 120degF thermostat. I've only run the motor in the warmer summer months and it started pumping quickly. It was ~30degf outside when I started and got scared when it wasn't "peeing" after running for 10 to 20 seconds...so i assummed it was the water pump.
              Hind sight...my impeller did not need replacing (that would explain why it look to be in good shape) but the thermostat just had not opened yet. Anyway I've got a new impellar and fresh lu oil.

              Thanks for everyones advice!!!

              Notes for others and myself next time I do this job.
              1986 Mercury 25 HP pull start.

              1) Put motor in forward
              2) Remove the 4 bolts hold the lower unit on (no need to remove trim tab)
              3) Next you need to disconnect the shift rod where is connects to shift lever up top. There is a black plastic tab with a screw located on the port side of the carb. I took a pair of needle nose visegrips to clamp on the little washer to keep it from falling. I backed the screw all the way out and the plastic clip with pin seperates to allow shift rod fall (helps to have a helping hand) I also removed the side cowling to access the plastic clip but I don't think it was necessary just made it a little easier.
              4) Pull the lower unit with shift rod and all out the bottom.
              5) Remove 4 bolts connect the impellar housing to the lower unit.
              6) Slide housing and impellar up off the drive shaft.
              7) Be careful for the washers (1 goes under the impeller and 1 goes on top the impellar)....also keep an eye on the shaft notch/pin thing that locks the impeller to the shaft.
              8) Put new impeller on and put housing over it while turning the shaft clockwise.
              9) Put everything back together. Be sure that the copper tube shaft for the water pump discharge lines up with tube up in the mid section motor.
              10)It only took me ~5 hours but I could do it in half that time now.
              Goodluck!
              1989 WellCraft Classic 180
              Mercruiser 3.7L w/Alpha1 drive


              2001 Ranger R81 - Yamaha 175 HPDI

              Comment



              • #8
                Re: 25 hp merc mechanical question

                I'm sorrry this is off topic, but you sound like you know your stuff, so I have a question for you; what is this part in the pic called and would it be responsible for not being able to stay in the final gear/ This part broke and the machanic replaced it with a different looking part and now I cant get into final gear and when I do its for about 20 sec.

                Please help Mike

                mikedarrow16@gmail.com










                Originally posted by modicon2 View Post
                Follow up: I got everything back together and it's pumping water!
                Important note to remember for the novice like my self is that this motor has a 120degF thermostat. I've only run the motor in the warmer summer months and it started pumping quickly. It was ~30degf outside when I started and got scared when it wasn't "peeing" after running for 10 to 20 seconds...so i assummed it was the water pump.
                Hind sight...my impeller did not need replacing (that would explain why it look to be in good shape) but the thermostat just had not opened yet. Anyway I've got a new impellar and fresh lu oil.

                Thanks for everyones advice!!!

                Notes for others and myself next time I do this job.
                1986 Mercury 25 HP pull start.

                1) Put motor in forward
                2) Remove the 4 bolts hold the lower unit on (no need to remove trim tab)
                3) Next you need to disconnect the shift rod where is connects to shift lever up top. There is a black plastic tab with a screw located on the port side of the carb. I took a pair of needle nose visegrips to clamp on the little washer to keep it from falling. I backed the screw all the way out and the plastic clip with pin seperates to allow shift rod fall (helps to have a helping hand) I also removed the side cowling to access the plastic clip but I don't think it was necessary just made it a little easier.
                4) Pull the lower unit with shift rod and all out the bottom.
                5) Remove 4 bolts connect the impellar housing to the lower unit.
                6) Slide housing and impellar up off the drive shaft.
                7) Be careful for the washers (1 goes under the impeller and 1 goes on top the impellar)....also keep an eye on the shaft notch/pin thing that locks the impeller to the shaft.
                8) Put new impeller on and put housing over it while turning the shaft clockwise.
                9) Put everything back together. Be sure that the copper tube shaft for the water pump discharge lines up with tube up in the mid section motor.
                10)It only took me ~5 hours but I could do it in half that time now.
                Goodluck!

                Comment



                • #9
                  Re: 25 hp merc water pump replacement question

                  Sorry about the delay....I haven't been on the site lately.
                  I think that part is the "lever-control".

                  Use the following link to verify.
                  http://www.crowleymarine.com/mercury_parts/274/40.cfm
                  1989 WellCraft Classic 180
                  Mercruiser 3.7L w/Alpha1 drive


                  2001 Ranger R81 - Yamaha 175 HPDI

                  Comment



                  • #10
                    Re: 25 hp merc water pump replacement question

                    it should always "pee", that just shows the pump is pumping...when the stat opens, the water comes out of a different hole.

                    someone correct me if i am wrong here.

                    Comment


                    Working...
                    X