Engine repowers

Will any gas or diesel motors from say 706, 806 era tractors directly bolt up to a gas farmall 400 tractors bellhousing? Looking for something in the 70-85 horsepower range. Diesel preferred.

Anything is possible to do,but is it worth it is the question. The newer motors out of 06 series are longer and and would require frame to be lenthened and some machine work. If you require more power you would probably be better off to update to a differant tractor. If your motor you have now needs work and you want to keep that tractor you wouldbe better off to overhaul that motor

Also you would open a big can of worms doing something about the hydralic pump. 400s had pump drove off the engine and and the newer tractors drive pump off the transmission

WAY cheaper and easier to just buy a newer/bigger tractor.........

B t, I agree with bob 7337, Yes anything can be done with any amount of money spent. But for the dollars spent you would be better to up grade to a 706 so you have the HP right out of the Box, with out major in-depth modifications. A good 706 that hasn't had it guts rung out of it should deliver 70 horses at it current condition, providing it isn't on its last gasps of life before it needs an
over-haul.
Your 400, if in need of an over-haul can be punched out to get near 70 Hp depending on the amount of $$$$ you want to spend, But you are at the top of the Hp range that the rear-end will stand. (We all remember the 460/560 Debacle!)
Hope this helps!
Later,
John A.

Ya can pull that easy and a tad more out of the engine that is in there with a fresh overhaulwith a set of HIGH ALT. pistons a Stock 450 gas head and a stock 450 gas manifold a rebuilt BLUE PRINTED cam and lifters. and it will have more then a stock 263 706. Now when i say HIGH alt. pistons i am not talking about step head or fire crater pistons.

Now we are talking. What's the difference between high altitude and say m&w pistons? Are the 450 heads much more superior to the 400? Would that set up be a reliable farm tractor or just a weekend puller? How should you set up the carb for more motor and how big of a bore can you bore the 400 block reliably? Lots of questions I know but new to farmalls. Thanks.

What is wrong with the 400 now?

I've just outgrown it I guess. It's on the verge of being a hedgerow tractor so I would rather do something fun with it than let it sit. I thought I could afford to do some motor work or repower it because the tractor isn't costing me anything sitting where it is. I don't want to put it up for sale because I don't like tire kickers or people just wanting to offer scrap prices for things, that really po's me. I would rather let things rot in the ground than have people think they should own everything for scrap price.

$$$$$$$$$$$$$$$%

Glenn F.

You could probably trade your 400 for a bigger tractor for less cost than fixing up the 400. You might even look at a few 856's or 966's.

i put a 263 out of a combine into a H once. im not sure if a 560 flywheel is what to use in a 6cyl swap into the 400-450 is whats needed or not. should almost be able to unbolt a 560 from frame rails forward, n bolt it onto a 400 bellhousing. but, again, not sure bout the flywheel. like other said, find high alt pistons, maybe a 450 lp head n be a real stout 264/281ci.

Not really , only machine work needed is doing the rods and that you would do on any rebuild and doing the head . No boring of the block or any fancy crank work and the last cam i had rebuilt and blue printed was 200 bucks.

About and inch on the top . The one thing you can not do is use and L P head . They are 4 and 1/8 pistons . No machine work on the block . I did a buddys S/MTA several years back . That tractor belonged to his grandfather . We put back in what we took out as the high alt. pistons were installed way back in about 1957 after that tractor burnt while under a corn picker and and old I H mechanic did the work the first time and that S/MTA was always a super runner way more power then any 560 around and only my buddy's grandfather and the old mechanic knew what was done to it . Till he brought it to me for a rebuild i had no idea what was in that engine till i opened it up all i knew was his S/MTA ran way better them mine did and his was plum wore out . When i pulled the engine out and pulled the head that is when i saw them pistons and i ain't never seen nothing like them before , talk about a DOME it really stands out . Well the numbers that were on them were I H part # . and they were 4 1/8 with sleeves Then the head # came up as a 450 gas head and it had a 450 manifold on it along with a 450 cam . The dist had the curve kit of a 450 and the carb was worked over a bit . It took some digging to get the pistons but i found one place that has them and we took a drive out to see Clyde Burkshire. Clyde fixed me up with the pistons and sleeve kits .Now don't ask how much as this has been maybe fifteen years ago . Is this in a PULLING tractor , Ah no it is a working tractor on a dairy farm . Back when i did the rebuild it was the main tractor . It did the plowing pulling 4x16 trailer plows and a 13and a half foot disc it did the chopping of the corn silage hauled manure every day for about three years till he got the 1950 Oliver then it got put back to the second tractor and as the years past it kept getting further back in line as bigger tractors were bought . Now it does the feed grinding on a New Holland 355 grindermixer and it does the spraying .

(quoted from post at 09:02:24 04/12/14) Will any gas or diesel motors from say 706, 806 era tractors directly bolt up to a gas farmall 400 tractors bellhousing? Looking for something in the 70-85 horsepower range. Diesel preferred.

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Yes it will bolt directly to the bell housing.

It might be easier to use a combine engine and use that front cover. It will have an engine driven hydraulic pump already installed.