KS321 rebuild.
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Thread: KS321 rebuild.

  1. #1
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    KS321 rebuild.

    Getting ready to rebuild the motor out of my 140.
    How do you tell if it's a standard size piston or oversized already.
    I don't think the motor has been torn down but not sure hence the question.
    Ant help is much appreciated.

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    Display Name: ss313
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    An oversized piston will usually have the size stamped on its top. The best way to tell is to measure the bore. You should measure the bore anyway to check for wear and roundness.


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    Display Name: DEERE317
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    Some Useful Links For A K Series:
    Rebuild Guide: HERE
    Parts: HERE
    Rebuild Kit: HERE
    Also even if it has been rebuilt, chances are that it is still original sized. If you're trying to tell if it might've been done look for stuff that is broken or messed up in weird irregular ways. (ex: My '81 317 has a KT17 Series II, 81's had Series I's, paint is weird on the steering tower, plastic dash bolts are broken, hood mounts busted, etc)
    Wish You Luck!
    -DEERE317
    1981 John Deere 317 Kohler KT17 Series-II
    John Deere 54" 4 Way Hydro Blade
    1990 John Deere 185 Kawasaki FC540V
    John Deere 42" Blade
    1972 John Deere 110 Square Fender Kohler K241AS
    John Deere 39, 38" Mower Deck
    John Deere #18 Wagon
    John Deere 48" Plug Aerator

    If It Is Making Weird Sounds And Vibrations, It Is Probably In The Process Of Breaking or Is Broken.

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    Quote Originally Posted by DEERE317 View Post
    Some Useful Links For A K Series:
    Rebuild Guide: HERE
    Parts: HERE
    Rebuild Kit: HERE
    Also even if it has been rebuilt, chances are that it is still original sized. If you're trying to tell if it might've been done look for stuff that is broken or messed up in weird irregular ways. (ex: My '81 317 has a KT17 Series II, 81's had Series I's, paint is weird on the steering tower, plastic dash bolts are broken, hood mounts busted, etc)
    Wish You Luck!
    -DEERE317
    I think I'll get the rebuild kit from isavetractors
    Just trying to figure out whether to go with standard or 10 over.

  7. #5
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    Display Name: Matthew Yoder

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    Quote Originally Posted by Soupkid View Post
    I think I'll get the rebuild kit from isavetractors
    Just trying to figure out whether to go with standard or 10 over.
    I took my block to my machinist prior to machining, to measure the bore and figure out what I needed. It's going to depend on how much wear there is and how much will need to be removed to get back to round.

    Both of my 321's had been rebuilt once, both had .10 over pistons. I think we jumped to a .30 over piston, to get it cleaned up.

  8. #6
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    Display Name: DEERE317
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    If it is within Kohler spec probably best to leave it stock, then if it eventually wears out it can be done 0.10, and again to 0.20, 0.30, etc if you want to get the most life out of the block, you can machine metal out, but can't put it back.
    1981 John Deere 317 Kohler KT17 Series-II
    John Deere 54" 4 Way Hydro Blade
    1990 John Deere 185 Kawasaki FC540V
    John Deere 42" Blade
    1972 John Deere 110 Square Fender Kohler K241AS
    John Deere 39, 38" Mower Deck
    John Deere #18 Wagon
    John Deere 48" Plug Aerator

    If It Is Making Weird Sounds And Vibrations, It Is Probably In The Process Of Breaking or Is Broken.

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