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  1. #1
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    Default 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Hi everyone, I went to drain the lower unit oil on my 1965 Evinrude Yachtwin 3hp and about 50% of the fluid that came out was water. I have not yet used this motor yet and it hasnít run in about 15 years. Most of those 15 years were spent laying on its side in someoneís yard. Is it possible that water just collected in it throughout the years on its side and slowly seeped through the lower unit seal? I canít imagine that water would stay in there for 15 years.

  2. #2
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    First thing to do is pressure and vacuum check the lower unit to see where the leak is.

  3. #3
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Do you have to do both a pressure and vacuum test? How would I do this?

  4. #4
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Also is it worth it to test it like this or should I just run it in a bucket, see if the new fluid becomes milky, then just replace all the seals?

  5. #5
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    If it was 50% water, it is leaking. No, it isn't because it was lying on its side, unless it was lying on its side under water. But then you have junk anyway. Just replace the seals. It isn't rocket science.

  6. #6
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    It could be all rusty and pitted in the gears. I would dismantle and completely inspect. Parts for this lower unit are easily found at a good reasonable price. A pressure test is good, but a vacuum test will confirm positively, a good unit. Be sure to turn shafts and operate shift rods, (if applicable), while pressure and/or vacuum is being applied.
    Last edited by timguy; 01-18-2021 at 11:45 PM. Reason: Typo

  7. #7
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    I’m planning on taking it off tomorrow, where would I find a seal kit for this?

  8. #8
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    If not here, right through Sierra/Marineengine.....try Tim's Outboard in Hackensack MN for hard to find parts/kits. 218-682-2331 Teresa Mike or Dan.

  9. #9
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Try this site right here.

  10. #10
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    I have looked here, I can’t find a kit, just the individual pieces.

  11. #11
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Yes....often my first choice too. Why?? Without the forum, I wouldn't be able to learn from all you guys. Just think how some stupid people will order cheap foreign made parts.....replacing stuff unnecessarily......instead of asking for help first, right here on the forum......then getting directed immediately to the problem. This league of experts can easily outdo many top end shops, with only a picture or two and some accurate answers to questions directed at the boat owner.

  12. #12
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Just double checked, they don’t have one . Only have 9.9hp and up

  13. #13
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Tim's can send out tomorrow. Give em a call with the model #. They have been around about 55 years. Tim is still active, would love to get him as a forum tech here.

  14. #14
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Just sent him an email. Last two times I contacted him he didn’t have the part, but to be fair they were pretty random parts off obscure engines lol

  15. #15
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    New seals and also new seals to the fill and drain plugs too. I always like use more expensive lower unit - oil on my Lightwin 3hp, because that particular oil should prevent failures, if fresh sea water find its way inside the lower unit.

  16. #16
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Ok ive taken the lower unit mostly apart. I’ve gotten down to the gearcase head behind the propeller and it won’t come off! I don’t want to damage it in any way but the thing is stuck on there.
    Last edited by Colezay; 01-20-2021 at 10:21 PM.

  17. #17
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    They might have used Permatex to seal up the joint between the bottom cover/skeg and the lower housing. Try a rubber mallet and give it some persuasion. Don't try to pry between the two or else you'll damage the sealing surfaces.
    Practicing the ancient art of ren-ching

  18. #18
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    I’ve tried hitting it with a rubber mallet quite a bit. I do have a heat gun and I’m going to try heating it up.

  19. #19
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    15 years of sitting with water in it may have caused some corrosion. Anyhoo, there is an o-ring around it. See if it will rotate a bit. If it will, try rotating it back and both as you pull. The problem is getting ahold of it to pull. Avoid the temptation to pull or beat on the ears, because they will break off. The best way is to rig up a slide hammer on the prop shaft to yank the whole thing out.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  20. #20
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    That should help. If there is corrosion, try soaking with a 50/50 mix of acetone and auto tranny fluid. Acetone is nail polish remover, but I buy in larger quantities. Use for paint and pyrotechnic/rocket fuel production.

  21. #21
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    the whole prop shaft slides out? I didn't know that. I can't even get the gear case head to turn by hitting it with a rubber mallet. How would I get a slide hammer on the prop shaft without damaging anything? I'm assuming I should probably get the gear case head at least twisting a little before putting a slide hammer on the prop shaft.

  22. #22
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    What I might do is put ATF in the lower unit and tilt it forward so it can soak into that surface.

  23. #23
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Gator probably has a slide hammer with a washer type end........put it into prop shaft, then just put the prop nut on and bang away. I haven't made one but it's in the works.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by timguy; 01-21-2021 at 04:40 PM. Reason: Add photo

  24. #24
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Wish I had the skills to make one... would it be possible to remove the prop shaft seals without taking that gearcase cover off? No matter what I’ve tried it still won’t break loose

  25. #25
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Link: Slide Hammer and Puller Set, 14 Pc. (harborfreight.com)

    I don't remember, I might have had to make a suitable coupling nut to adapt to the prop shaft threads, Anyhoo, the deal is attach the puller to the prop shaft and bang away with the slide hammer to yank it out.
    Last edited by fdrgator; 01-21-2021 at 10:52 PM.

  26. #26
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Quote Originally Posted by fdrgator View Post
    Link: Slide Hammer and Puller Set, 14 Pc. (harborfreight.com)

    I don't remember, I might have had to make a suitable coupling nut to adapt to the prop shaft threads, Anyhoo, the deal is attach the puller to the prop shaft and bang away with the slide hammer to yank it out.
    So all I would have to do is put that attachment on that looks like a long nut? Could I use that to pull the seals out as well? This motor definitely has the original seals

  27. #27
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Its likely not the correct threads. That other little attachment that looks like a fork might work, but it's kinda stupid because it's gonna slide off. They should make an attachment like in my drawing.....detail see below. Then you can just use the original prop nut, and the force will direct squarely.
    No, once the housing has pulled out with the shaft, you take the shaft out of your way and push out the seal from behind with something like a punch.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by timguy; 01-21-2021 at 11:32 PM. Reason: Add photo

  28. #28
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Quote Originally Posted by Colezay View Post
    So all I would have to do is put that attachment on that looks like a long nut?
    That's the main idea-----IF it should happen to have the right threads.

  29. #29
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    And if it doesn't fit?... lol

  30. #30
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    Default Re: 1965 Evinrude Yachtwin 3hp possible bad lower unit

    Fat chance it will have the right threads. Gotta make something like my drawing.....it's not patented yet....I give you permission.

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