Detroit Diesel 2-71 Farmall M

MikeS806/H · Jul 21, 2017

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This has been my project tractor, 2-71 Farmall M, I have a question about the Detroit, is vibration normal with a 2-71? it has N series liners and pistons and HVN75 injectors, I"m using the Farmall M flywheel.

Dean · Jul 21, 2017

I'm not sure about either the 2-71 or the original Farmall engine but if either is externally balanced (likely) using the wrong flywheel will cause torsional vibration which will cause the crankshaft to break.

Dean

gene bender · Jul 22, 2017

call Chris Peiffer he has had one for yrs 641-224-2406

big tee · Jul 22, 2017

I LIKE IT!!!!---Tee

the tractor vet · Jul 22, 2017

It's your flywheel as it was somewhat balanced for the 4 cylinder and it was not balanced to much over 1550 RPM . And trust me on this one you do not want that breaking off and coming thru the bell housing at 2450 RPM . For best results here have a flywheel made out of 4340 and spun balanced , also change the vibration damper on the engine .

buickanddeere · Jul 22, 2017

As previously stated the problem is the M flywheel and clutch. Requires a high rpm aftermarket M clutch that is balanced for the 2-71.
Could be pushing 95 flywheel HP at 2400rpm.

big tee · Jul 22, 2017

Is Chris the AC tractor puller?---Tee

MikeJM · Jul 22, 2017

How did you adapt the M flywheel to the Detroit crank? How are you centering the flywheel? That could be your issue right there.

But is all seriousness, don't use that old M flywheel, get a steel one made and it be right for the job and you won't have to worry about it failing.

MikeS806/H · Jul 22, 2017

The M flywheel (actually a 400 flywheel) was redrilled on a CNC mill to the 2-71 bolt pattern and a spacer was made from the center of the 2-71 flywheel and machined to fit into the M
flywheel, I checked the runout and it was .006 but I bolted it to the old M engine and runout was .006, I"m thinking about taking the flywheel to a shop and have them balance it

MikeS806/H · Jul 22, 2017

I"m going to take the flywheel in to the high performance shop and have them balance it, ill take the pressure plate in too, I have a dyno, I hope to see that much HP! I was guessing 65hp

buickanddeere · Jul 22, 2017

(quoted from post at 15:03:27 07/22/17) I"m going to take the flywheel in to the high performance shop and have them balance it, ill take the pressure plate in too, I have a dyno, I hope to see that much HP! I was guessing 65hp

What part of "no don't do it" do you not understand ? M flywheels and pressure plates are noted for failing with extra rpm and HP.
Yes we know you spent a lot of bucks on the old piece of crap flywheel, a new steel flywheel costs $$$ and it is a lot of work to pull the engine gain.
It is also a lot of expense and work after that stock flywheel fails and it will fail.

Riverslim · Jul 22, 2017

Guy in my neighborhood has one in an Oliver 66

danofarming · Jul 22, 2017

Looks to me like there is room for another Cylinder!?

Frank 41 · Jul 22, 2017

I would worry next about the rear end on the IH.

MikeS806/H · Jul 22, 2017

No I didn"t spend big bucks on the old flywheel, I haven"t seen or heard of a Farmall M flywheel or pressure plate fail, its not a lot of work to pull the engine i"m going to to paint it
anyways, I have dynoed two Farmall M"s over 100hp with stock flywheels & pressure plates and they have been pulling them for years, if this was a 350 chevy in it there would be a problem
and I have heard of people using the M flywheels behind a 350 and a 454

MikeS806/H · Jul 22, 2017

Yes there is room, My next project is a 4-53 in a Farmall 706

Detroit Diesel 2-71 Farmall M

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