• 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.
  • ALL iboats Forum Members and Guests:
    To show our appreciation for your participation in the Forums, we're offering an exclusive Forums-only discount good for an additional 5% off your iboats.com order for a limited time.
    To redeem, simply call our Customer Service Team at 800-914-1123 (Open M-F, 9am - 8pm Eastern Time) and mention the Forums 5% off discount. Offer excludes engines, trolling motors, and electronics.

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 threads or hijack existing threads. Old threads of a technical nature are like a library book, Please do not write in them.

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

3. Do not take over someone elseís thread (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 thread of your own.

4. If you have a question for the original poster (OP) and the thread 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 thread.

5. By starting your own thread, 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 thread. And those answers will be specific to your particular issue.

6. Please do not post to threads that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any thread 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 thread.

7. Posting at the end of any thread is considered to be hijacking the original posters thread which in turn subjects the thread 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 thread asking you not to reply to old threads. The Red banner will read: Please note this thread has been inactive for 90 days. For the best results, please start a new thread.

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

Small leaks between lower unit and upper unit

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


  • Small leaks between lower unit and upper unit

    Hi,

    I have an Evinrude/Johnson 100hp 4 cylinder 1983 model that I have a question on:

    When I pulled it out yesterday to run the motor using muffs, I noticed about 3 pinhole sized water leaks on the left side where the lower unit meets the upper unit. There were I believe another 2 on the right side. They would squirt water either at idle or at 3000 - 4000 RPMs.

    Is this a problem or can I continue to run it that way? If it's serious, what kind of effort will there be to fix it? I also saw what appeared to be an "intentional" hole at the front of the upper unit that also squirted although it looks like that hole should be there. Other place it was shooting water out of was the fin holes but I think that are also intakes? Don't know for sure, could be muffler exhausts?

    Any help on the pinholes really appreciated. My primare use is saltwater fishing.

    Hank


  • #2
    Re: Small leaks between lower unit and upper unit

    First off, you shouldn't be running the mtr at 3000-4000 rpms on muffs unless you want some internal part to come out and say "Hello". As long as the mtr isn't overheating this is perfectly normal.

    Comment



    • #3
      Re: Small leaks between lower unit and upper unit

      Stupid question but.... Why can't he run it at whatever RPMS he wants as long as it's on water?

      As far as the water "leak" are you sure you don't have too much pressure running from the hose to the motor? It doesn't require but like 15 PSI, but the average house has like 50 pounds of water pressure. Too much pressure will cause the water to come out of other areas, and isn't a good idea.

      Comment



      • #4
        Re: Small leaks between lower unit and upper unit

        Reread above ... like the motor might blow up! The joint between the LU and midsection is not sealed. Dumping WAG's here is not helpful.
        Jim

        ===============================
        I don't respond to Private Messages PM's that are motor questions.

        For basic information on a wide range of topics, see Top Secret File
        Link: http://forums.iboats.com/showthread.php?t=299680

        OEM shop manual: outboardbooks.com or Ebay

        Comment



        • #5
          Re: Small leaks between lower unit and upper unit

          Jim311, he said he was running on "MUFFS". Not in the water.

          Comment



          • #6
            Re: Small leaks between lower unit and upper unit

            Judging from all the return posts, I may have too much pressure on the muffs and shouldn't be running the rpms so high. I guess the consensus if I keep using the motor in the water (letting the pump suck in the water) it should be ok?

            Please let me know, I'd hate to blow the motor as it's a commercial grade motor and runs good.

            Thanks to all.

            Hank

            Originally posted by Hank Bass View Post
            Hi,

            I have an Evinrude/Johnson 100hp 4 cylinder 1983 model that I have a question on:

            When I pulled it out yesterday to run the motor using muffs, I noticed about 3 pinhole sized water leaks on the left side where the lower unit meets the upper unit. There were I believe another 2 on the right side. They would squirt water either at idle or at 3000 - 4000 RPMs.

            Is this a problem or can I continue to run it that way? If it's serious, what kind of effort will there be to fix it? I also saw what appeared to be an "intentional" hole at the front of the upper unit that also squirted although it looks like that hole should be there. Other place it was shooting water out of was the fin holes but I think that are also intakes? Don't know for sure, could be muffler exhausts?

            Any help on the pinholes really appreciated. My primare use is saltwater fishing.

            Hank

            Comment



            • #7
              Re: Small leaks between lower unit and upper unit

              If you are the type of person that it bothers, drop the lower unit and clean the mating sections, or you can just run it and not worry about it.

              Comment



              • #8
                Re: Small leaks between lower unit and upper unit

                Just to be clear, the engine shouldn't be revved like that even IN water, in neutral. The engine needs to be in gear when revving up that high. A neutral no-load rev that high isn't good.
                1997 Ruffnek 160 (Ranger 320v clone)
                1997 115 Evinrude Intruder V4

                Comment



                • #9
                  Re: Small leaks between lower unit and upper unit

                  Thanks to all for the help. I'd rate this forum as tops of any website. Everytime I've had a problem, all the posters have hit the problem right on the head. Thanks again.

                  Comment



                  • #10
                    Re: Small leaks between lower unit and upper unit

                    Thanks Seaman!!

                    Hank

                    Comment



                    • #11
                      Re: Small leaks between lower unit and upper unit

                      Thanks Cap!

                      Hank

                      Comment



                      • #12
                        Re: Small leaks between lower unit and upper unit

                        I don't know if you've pulled the gearcase off before, but if you do, you'll see it's all open in there. No gasket between the lower unit and the midsection. Free flowing water.

                        Comment



                        • #13
                          Re: Small leaks between lower unit and upper unit

                          Never/ever run the motor past idle on muffs. Muffs are only making sure the motor runs.
                          High Revs on Muffs is BAD.

                          Comment

                          Working...
                          X