FarmerBrown

H Farmall engine swap

13 posts in this topic

So I had this crazy idea the other day and I'm in need of some advise. I have a H Farmall that went through a barn fire and the engine was appart so that's pretty well tost. But I also have a 656 with a trans that's toast beyond repair. Could I set the 656 in the H for pulling and fun with out major modifications, or am I going to need an adapter? Also will a H Farmall trans hold up to the power of the 656 engine if the internals are good? 

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Is is possible, probably. The H rear end should hold up to that horsepower if you are careful and just use it as a toy and not weight it down and throw a big plow behind it all day. However, will it go without major modification.... probably not. You are going from a 152 cubic in. 4 cylinder to a 282 6 cylinder so it will likely be quite a bit longer and wider so it will require an adapter, frame modification, and you will have to find a way to adapt the flywheel/clutch set up. Then you will have to probably make a custom starter mount as the stock starter and location in the bell housing I doubt would match a 656 engine in depth or pattern one you use an adapter. Anything is possible with the right fabrication skills, machine shop, and $$$ but I doubt it would go together without major modifications. It would be an awesome project but would probably involve a lot of different modifications.

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Is the 656 a gas or diesel? Either way the frame rails will need lengthened. 

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Well I'll start messing around it's a gas motor and the budget is low as usual I'll keep posting my progress thanks guys

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1 hour ago, Matt Kirsch said:

really like to see you do this because it would prove to everyone that the 656 is descended from the H, not the M like so many people insist.

I always thought a 656 was an updated 560 which had an outdated M transmissionand and rear end.....so how do you figure it was a decended from the H? Just because it was the smallest row crop in that time frame? If thats the case i would argue that the H's spot was basically done away with due to the higher horsepower needs and bigger farms in that time period. Idk just my 2cents.

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The 656 comes from the 460, 350 , 300, SH,H. The 560 was the last to use the "M" rear.

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Ok so forgive me but if the M rear wouldnt handle the hp what did they do to make an H transmission handle 460 and up hp? 656 had same hp or more as a 560 didnt it? I never really read up on the 460 and 656s i guess.

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656 has a small frame bell housing but the rear end is stronger than a M. Dave

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Should say that the "lineage" of the 656 goes back to the H, the rear is an updated 460 with a heavier final drive, gearbox and differential. The 666 and 686 would put out at least 70hp so it was certainly strong enough.

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Sorry i just always thought , and made sense to me that ih would have used the biggest rear half for that size and hp that they had and assumed it would have been M-560.Learn something all the time.

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take a tape measure and measure cl on top of back axle, forward to cl of diff shaft,  (brake hub)  on H, it's 81/2", same as 656. now do same for M,- 560, it's 10".

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