• 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

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

1991 150 evinrude lower unit

Collapse
X
  • Filter
  • Time
  • Show
Clear All
new posts


  • 1991 150 evinrude lower unit

    I'm putting new back to back seals in the driveshaft bearing housing when i notice a small hole that (I'm guessing here) carries oil to the bearings inside the housing? If so, then why does the first seal i install effectively cover it up ? How does the oil get to the bearings? Also, does the orientation of the hole, with respect to the lower unit, make a difference? i.e. does the hole face forward or backwards towards the prop? Thanks in advance.


  • #2
    Re: 1991 150 evinrude lower unit

    okstfan....usually the first seal goes in just to the top of the oil hole. Are you sure your not pressing the seal in to far?
    When in doubt...use the manual

    Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.

    Comment



    • #3
      Re: 1991 150 evinrude lower unit

      Ooops! your're right. My bad....it's late and I shoulda quit an hour ago. It's in too deep and i've covered the hole #$%@! BTW, Once i get the bearing housing bolted in, how much side to side movement should the driveshaft have? It seemed pretty loose before i tore it down. When i pulled the oil plug, i didn't see any filings to indicate excessive wear. How much is too much? Thanks for the seal/oil passage info.

      Comment



      • #4
        Re: 1991 150 evinrude lower unit

        It'll seem like it has a lot of play but it's OK. Confounded me to the first time I ran into it.
        When in doubt...use the manual

        Rayland, Ohio....Along the Muddy Banks of the Mighty Ohio River.

        Comment



        • #5
          Re: 1991 150 evinrude lower unit

          Are we talking drive shaft or prop shaft here.

          Comment



          • #6
            Re: 1991 150 evinrude lower unit

            Thanks for the info. I went ahead and put a new waterpump repair kit on. Man, digging those old o-ring gaskets out of the housing was a pain! That adhesive sealant really sticks to the housing and o-ring. One more question. I'm also working on my counter rotating lower unit. When i shift (pull/push the shifter up or down into forward/reverse) gear, I cannot turn the propshaft and driveshaft in either direction. Of course, in neutral, the propshaft turns as usual, but i cannot rotate the driveshaft. Any thoughts?

            Comment



            • #7
              Re: 1991 150 evinrude lower unit

              Pull the impellor out and then see if you can rotate the driveshaft. The impellor is hard to turn, especially dry.

              Comment



              • #8
                Sign up today
                Re: 1991 150 evinrude lower unit

                I've pulled the water pump (and impeller), removed the drive shaft bearing, associated shims, thrust washer and thrust bearing. Still i cannot rotate the driveshaft and propshaft when in forward or reverse. The shifter will go into forward/reverse, but not the shafts. Is the fact that this one is counter rotating make a difference? It seems to me that it would be the same as my other one. I've read the lower unit section on my OMC service manual with no luck. Arrrgh!

                Comment


                Working...
                X