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Farmall & IHC Tractors Discussion Forum
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706 diesel swap...

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Sean Wetgen

10-30-2006 10:43:40




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I have a 1965 Farmall 706 that has a 263 gas motor. Motor is going fast and was wondering on a diesel swap. I know they had the 282 and I really don't want that motor. Friend has a 756 with a D310 and I seen the late 706's started with that motor before the series change. What is all different to swap the motors? I see the gas block bolts to a plate then the plate bolts to the housing of the bell. But the diesel uses a 1" or so spacer. Is there any major conversions to be done for the output shaft and/or flywheel and clutch? Can I use my gasser's clutch on the diesel. Is the tin work longer, if so which parts. I wanna know it all. Cause I wouldn't mind to switch to diesel for the durability, fuel consumtion, and raw torque. Thanks!

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the tractor vet

10-30-2006 15:14:26




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 Re: 706 diesel swap... in reply to Sean Wetgen, 10-30-2006 10:43:40  
Well if it was me and the 263 is heading out to lunch , i would make that old wore out 263 into a 291 and make it a better gasser . But that is me and when i build one of them 263to 291's i sometimes get carried away with the build as i do a line bore on the block then have the block bored to the center of the crank then deck the block and do a total rebuild of the head . Then i get the cam rebuilt and install new lifter then comes the balancing of everything from the ft. of the engine to the clutch as this is the cheapest horsepower ya can buy . go thru the carb and ream the main jet out .001 recurve the dist to the 291 spec's and when done it will run the bag off a good 806 and in the end it is way less money then tryen to make the switch . And a whole bunch less problems in the end and high test gas is still cheaper then diesel.

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Nat 2

10-30-2006 13:12:04




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 Re: 706 diesel swap... in reply to Sean Wetgen, 10-30-2006 10:43:40  
You basically need everything mechanical between the front bolster and the bell housing.

Working from memory:
The flywheel is different.
The clutch is different.
The pressure plate is different.
The front engine mounting is different.
The rear engine mounting plate is different (thicker as you've already discovered).
The frame rails are different (shorter to account for the thicker rear mounting plate) while keeping the tractor the same length.
The radiator bottom outlet is on the opposite side.
The fuel system requires a return line to the top of the tank, which the gas tank doesn't have.

Some of these issues can be addressed with clever fabrication.

Your best bet is to find a 706 or 756 with a D310 and a bad rear end, and use the parts.

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