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Kokomo

ENGINE INTERCHANGE

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Kokomo
I am new to restoring AC/Simplicity garden tractors. I recently purchased an AC 716 on ebay; complete except for the engine and adapter from the engine to drive shaft. Is there such a thing as an ENGINE INTERCHANGE MANUAL for AC/Simplicity garden tractors. It is my understanding that this tractor originally had a Kohler K341 engine. I assume a 12hp-K301, a 14hp-K321 or a 10hp horizontal Kohler from any AC/Simplicity will work. Of course I do not have a spec. no. and I am not sure it would help if I did. I have a 12.5 vertical shaft B/S Vanguard. Is it practical to change it to it to horizontal shaft and install it in a 716? I have searched the old topics and find nothing. Bob

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maxtorman1234
Any kohler k series engine will work, you will either have to switch the oil pan, or drill holes for the plugs:D. I have done this to 2 different tractors, and now they will accept any K series kohler that a/c used.

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goatfarmer
With a little work,and ingenuity,almost any horizontal shaft engine can be made to work. I've got a newer Briggs 11HP in my 3410,when 2 dealers told me to junk the tractor,it couldn't have a different engine installed. I don't think you can make the Vanguard work horizontally.

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Chris727
I don't belive there is a manual regarding engine swapping but I know you'll have to use an engine that is already a horizontal shaft. Kohler will work fine but a cast iron Briggs will work too with some wiring and driveshaft modifications. If this tractor has a hydrostatic transmission you will probably want at least a 12HP motor because they say the hydro takes 2 HP away from the engine, but if youre not going to be running pto attachments like a mower, I guess a 10 HP would be enough.

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HubbardRA
I have a 10 Hp B/S mounted on my AC716H. It works fine. Drives a 48 inch mower and I recently mounted a 36 inch snow blower. It does not appear to be underpowered with either. I'm sure you could work a little faster with 16 Hp, but I'm in no hurry because when I'm on the tractor, that is where I want to be.

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Kokomo
My tractor is a six speed 716, my son has a JD 210 with a horizontal engine. I assume this is a 10hp kohler. I have not seen it yet, does anyone have any ideas about this engine mounting up to 716 without modification? Bob in Kokomo

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IronPony
There seem to be plenty of K series engines around. I would wait until I could find one that would bolt right in. I found a K341 for only $300 on eBay. It is now in my AC712S and running great. It was originaly powering a start-all unit for heavy equipment and trucks. I have seen several of these units on eBay and it looks like no one knows what they are. I watched the seller let his auction run out with no bids then emailed him with an offer. Good Luck - Dan

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IronPony
Bob, Yes I am. The 10, 12, 14 and 16 horse - K241, 301, 321 and 341 respectively will all bolt right in. Had only 2 problems to overcome when I repowered my AC712 with a K341/16 horse power. The engine I bought (K341, 16hp) used power from an outside source to operate the starter. (it was mounted in a pickup truck and used the truck battery to power the starter). I had to trade the flywheel off for the one on my oil burning K301 and use the stater with it. For access to the oil drain plug I had to trade oil pans also. Most of the parts on the K series interchange. There are some that don't and most of them have to do with the 16, K341. Some other tractor manufactures used a different oil pan that will NOT bolt right in an AC or Simplicity. I am NOT an expert but there are some experts here in the club. Good Luck. Dan PS - I repowered with the 16 horse replacing a 12 horse only because that was the engine I found at a price I could afford, not because I wanted more horse power.

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