Johnson TN Stuck, where to start?

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  • wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #239816

    I just picked up a Johnson TN last night. If I try to spin the prop, it has zero movement but I can feel just a hair of movement (like a gnat hair) grasping the flywheel. It was the seller’s Dad’s and he knew nothing about it. Is there anything with the neutral clutch that could lock it up? Just curious if there are any “high flyers” to check out first on these motors?

    Thank you.


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239826

    dropping te GC gets complicated cause you need to disconnect the neutral cable… try popping the fw as a starting point cause you need to inspect the coils anyway (likely all cracked)

    you will need an impeller so dropping the GC can come later anyway and… maybe the clutch is broken diagram TN GC1 ..

    . and this will tell you if the blockage is above …or below in the GC 🙂

    shoot some wd40 in the cylinders just is case but stuck rings would probably stop ANY movement worth a try

    next could be the cyl. head to inspect the cyl walls and pistons

    after the mechanics are fixed comes the carb …
    http://www.pochefamily.org/outboard/CarbService.html

    is it a TN 26 -27 ???

    Joining AOMCI has priviledges 🙂

    • This reply was modified 4 days, 23 hours ago by crosbyman.

    Buccaneer

    US Member - 1 Year
    Replies: 4691
    Topics: 796
    #239828

    It wouldn’t take long to remove the prop and cap off the gear case
    to see if it’s full of rust instead of grease.

    Prepare to be boarded!


    wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #239834

    It’s a TN25. Thank you, as soon as I have some time I am going to dive in on it.


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239847

    see info

    Joining AOMCI has priviledges 🙂

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    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239850

    see TN GC 2

    Joining AOMCI has priviledges 🙂

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    wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #239855

    Crosbyman, Thank you!, those will help!


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239873

    as a aomci member you would have access to download the 400 or so pages of the johnson repair manul covering oldies… from your TN td and up to late 50s

    it is in the MEMBERS ONLY section under INNER SANCTUM…LIBRARY…Garry Spencer’S drop box…. down the file is a RED BOOK…. where the pictures provided come from 🙂

    Joining AOMCI has priviledges 🙂

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    wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #239928

    Yes, I have realized joining is a must do and will be shortly. Thank you again.


    wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #239948

    I am now a member : )


    crosbyman

    Canada Member - 2 Years
    Replies: 2121
    Topics: 227
    #239957

    Super, thanks for joining… happy downloading !

    store the red book on your PC as a PDF file and…if you prefer copy it on a USB key and have a local print shop print it out and put a spring binder for easy. .flat reading .

    top and bottom with a plastic sheet to protect your new book 🙂

    Joining AOMCI has priviledges 🙂

    1 user thanked author for this post.

    wanderlustjake

    US Member - 1 Year
    Replies: 34
    Topics: 11
    #240083

    I dug out my bore scope to check the cylinders. Sand on the cylinder head wasn’t a good first sign. I don’t know, but this one may have went for a swim.
    Here’s a couple pictures with the scope. Top picture is lower cylinder, 2nd picture is top cylinder, looks a little crusty in there. Going to start soaking with wd-40.
    Any input would be appreciated.

    Thanks,

    Jason

    Attachments:

    Buccaneer

    US Member - 1 Year
    Replies: 4691
    Topics: 796
    #240095

    My personal thoughts would be that there’s plenty of TN’s “out there”, and you might be better off
    using yours for parts for one that’s not froze up. Life is too short to fight with a frozen TN.
    A rare outboard is another mater.
    That said, it’s good experience / practice working on frozen ones, and sometimes a guy
    can salvage them if not froze too bad.

    Prepare to be boarded!

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