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Farmall & IHC Tractors Discussion Forum
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M Family Lineage

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City-Boy McCoy

08-14-2006 07:21:26




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Gentlemen:
I am curious to learn the "M" family lineage. I know it went rom M to SM, to SMTA, to 400. Was that the end, or did it go on to 450, or even further?
I am talking about DIRECT lineage, meaning some major common castings and/or interchangeability, as examples - not some entirely new model which may have taken the place of the M lineage tractors.
Thanking you in advance I am,
Sincerely,
City-Boy McCoy

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Nat 2

08-14-2006 08:08:44




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 Re: M Family Lineage in reply to City-Boy McCoy, 08-14-2006 07:21:26  
Very little changed from the 400 to the 450. It"s still very much an M with stuff bolted on to it.

The next step in the lineage would be the 560. While the 560 does have a 6-cylinder engine and an internal hydraulic system, and several areas of the tractor were beefed up, it"s still very much an M in its basic design. The transmission gears, while not the same ratios, will interchange between an M and 560. The frames are the same width, so the rear end of an M could be bolted to the front end of a 560 and vice versa.

Beyond the 560 are the 656, 666, and 686. I"ve heard that the 656, 666, and 686 are more H than M, though...

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Brian Greer

08-14-2006 07:36:22




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 Re: M Family Lineage in reply to City-Boy McCoy, 08-14-2006 07:21:26  
From my knowledge it stopped with the 450. The major difference between a 400 and 450 was the 450 had 4 1/4 pistons instead of 4 1/8. The 450 also was painted with a white front grille and some on the sides instead of the 400 which was all red. Some of the late 400 blocks where capable of using the 450 sleeves, but I don't remeber the serial number break of the top of my head. Just for completeness, early M's were 3 7/8 bore and later M's where 4". SM's were 4 1/8. The main difference between the non and super is disk brakes vs band brakes. Don't forget about the SMTA's which were basicly 400 chasis with SM style tin work. The hood on a SMTA is about an 1" longer if I remeber right though. If anybody finds errors in my specs, please let me know. I have rebuilt several of each, but I just woke up a bit ago and its too early for math numbers! My stepson and I just hauled 28 old farmalls to the American Threshermans Show in Pinckneyville, IL yesterday (and early early morning). Hope this helps.

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Dr.EVIL

08-15-2006 07:54:00




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 Re: M Family Lineage in reply to Brian Greer, 08-14-2006 07:36:22  
Actually, ALL M's were 3-7/8" bore from the factory.... SM, SM-TA, & 400 were all 4" bore from the factory and 450's were 4-1/8" bore. Common stroke of 5-1/4" among all. Back when these tractors were new and being used they typically had overhauls after 3 to 5 yrs, some maybe a little longer, 8 to 10 yrs. That's why You find so many M's with 4" bore, etc. In the case of My Dad's '51 M He bought new just before X-mas '51 it was over-hauled the first time with 4" 5000 ft altitude pistons in about 1956 or 1957 and repainted, then the 4" M&W FireCrater's were installed in about 1966. It was semi-retired in '72. It had further repaints in about 1968, and 2005.

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City-Boy McCoy

08-14-2006 10:21:59




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 Re: M Family Lineage in reply to Brian Greer, 08-14-2006 07:36:22  
Thanks, fellas. Very interesting!
Mike



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