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can the onan on my 318 be install on my 317 are they interchangeable..?? thanks in advance....johnny
 

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The Onan repower program for the Series I’s had a special mounting plate that was used. It definitely could be done without that plate, but usually the plate is used.
Would be a good engine to replace a dead/missing KT17. If your wanting to replace a good/easily rebuildable Series II though it would probably be easier to keep the Kohler.
 

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Yes the Onan P218 can be 'transplanted' from a 318 if the starter is changed. Attached is the parts catalog from the 317 that shows the needed adapter plate and other little pieces that were used with the Onan. Also attached is the installation instructions...

Chuck
 

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There is a John Deere/Onan engine conversion kit on EBay now. I can't remember what the price is but that would be the easiest way to accomplish it. Other than finding another Series II or Magnum which would bolt right in.
 
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