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Re: 320 Engine Identification

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Brent Hill

01-28-2013 18:43:34

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Perhaps this is not a 320 but a 40 - added a couple photos if anyone can tell. According to, the engine number would fit into the 2/8/1954 category.

Also, I might be mistaken on the sleeves. When I looked inside the block it seemed like it but with the pistons out I buffed an area on the top of the block and it looks to be stock. The cylinder casting must run long inward a bit on these.

I'm guessing either there is not much time on the engine or these were pretty long lasting. I find no ridge, the cylinder looks to be right at 4.00 bore, the main a hair under 2.400 and the rod journal a hair under 2.5. Too bad it was so rusted up inside the engine - the rest of the tractor seems great.

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01-29-2013 06:05:33

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 Re: 320 Engine Identification in reply to Brent Hill, 01-28-2013 18:43:34  
Your Tractor is a 40U.
As far as I know the 320 tractors had a different steering box/worm/pedistal setup than your tractor is showing (as well as the differences in the grille mentioned below). Still a nice tractor; that block should be fine to use if it checks out ok. Some of the early 40 tractors just had M64 cast into the block, which is why your "T" may be missing.

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01-29-2013 03:41:38

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 Re: 320 Engine Identification in reply to Brent Hill, 01-28-2013 18:43:34  
I think your tractor ia a 40U. The 1 pc grille screen was used on early 40U's. Later 40U's, as well as 320's, had 2 pc grilles. Have the cylinders and pistons checked by a machine shop. You may only need to hone and re-ring if they aren't worn too bad.

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