• 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

Oil leak from lower unit

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


  • Oil leak from lower unit

    Mercury outboard 65 hp est. mid-1970's. I'm fairly new to working on outboards, but mechanically inclined. Trying to change LU gear oil, the marina guy said to use "flush" screw to pump in new oil while "vent" screw open. No old oil can out of the flush hole, and only got in about a third of the new gear oil. Closed the screws and later noticed oil leaking from the propeller, as well as from the water intake screens. First of all, how to get more gear oil in, and secondly, what has caused the leaks? What is the suggested repairs? Thanks.


  • #2
    Re: Oil leak from lower unit

    ok harv, the man told you wrong, the flush goes to the water pump base to flush the water pump and the engine.the lube you have leaking now has gone into the water pump , no damage caused. the gear lube plugs are the the one marked vent by the flush screw and the one on the front/bottom of the lower unit. remove those two screws and let the old lube drain, then refill with gearlube from the bottom /drain hole till it comes out the vent. then with new seal washers on the plugs install the vent screw then remove fill fitting[assume you are using small hand pump on quart bottle** and replace the drain plug.

    Comment



    • #3
      Re: Oil leak from lower unit

      Leaks can occur from several locations. The most common being the vent and fill plugs. I'd do a good oil change and monitor the oil quality every trip until you find the leak if any. An actual seal/gasket leak can be detected by a vacuum/pressure test, but do the simple things first.Here is a good guide to a oil change. When done, I top up the vent screw hole with a squirt can full of LU oil until oil comes out. Let it come out of the vent screw until it seeks its own level.As johnkc says, be sure to use new plug gaskets every time!!! Click me
      Alias "schematic"

      Comment



      • #4
        Re: Oil leak from lower unit

        OK John, have located the lower plug - thanks, that is a relief! Now, the oil that's in the water pump, will it completely expel - and is that why I saw oil coming out near the prop? Again, thanks.

        Comment



        • #5
          Re: Oil leak from lower unit

          Hi Harv Yes your oil will drain on it's own, as John said no damage done. It might be a little messy down there for a while. Might want to keep a drip pan under it for a day or two.

          Comment



          • #6
            Re: Oil leak from lower unit

            harv , go catch some fish , the oil in the water pump will dissapate after running for a few minutes.when you did the lube job you probably put in enough oil to fill the water tube then the lube went into the exhaust/cooling passage therefore it drained out the exhaust and thru the prop

            Comment

            Working...
            X