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?1950 Farmall H

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Andy in Ohio

01-03-2002 14:37:15




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I posted several weeks ago about the fact that I had a lot of compression differences in this tractor. Well after taking the head off I found at least 1 burnt valve. ? are the pistons normally humped like these or they supposed to be flat? Also is it safe to clean the head with hot water and solvent before taking it apart or should I take it and have it cleaned? Thanks for the input Andy




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Denny Frisk

01-04-2002 10:29:32




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 Re: ?1950 Farmall H in reply to Andy in Ohio, 01-03-2002 14:37:15  
Actually "H's" had cast iron flat top pistons from the plant. Super H's had alum. pistons... If You measure Your pistons You'll probably find they are 3-7/16" dia. instead of the factory 3-3/8" I'd buy a couple cans of "Brake-Clean" spray solvent to clean-up the head before you take it to the shop. Use paper towels or old T-shirts, etc. to get most of the dirt/grease off. I've heard Oven Cleaner works great too. If Your having a shop rebuild the head they will probably "Hot Tank" it... hot agitated chemical cleaning... It will look like new when it comes out of the tank. That cleans it on the inside as well as the outside. The shop will need it clean to check for cracks, etc.

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Will

01-04-2002 06:35:25




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 Re: ?1950 Farmall H in reply to Andy in Ohio, 01-03-2002 14:37:15  
Andy-zonie's right. For the most part the high compression pistons were an option for high altitude sales. I've just started tearing down an M and it's got the same thing. The big difference, from what I gather, is when you get ready to order new parts. I think it's held, and "The Red" or "Big Fred" can probably tell you if it's true, that if the engine was originally eqiupped with them, then you have to rebuild it with those.
As far as cleaning the head with water... I dunno. I wouldn't. I cleaned the head on my B with varsol, gas and a stiff brush before I ran it over to the machine shop.
Just my 2 cents.....

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Zonie

01-04-2002 05:36:34




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 Re: ?1950 Farmall H in reply to Andy in Ohio, 01-03-2002 14:37:15  
The humped pistons are most likely either IH fire crater pistons ( high altitude ) or M&W hi compression pistons. in either case they raise the compression considerably and are good for a few extra horsepower. They will run fine on regular unleaded fuel at any altitude. these old tractors were designed to run on much lower octane gas than we have now days.



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Larry

01-03-2002 19:27:38




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 Re: ?1950 Farmall H in reply to Andy in Ohio, 01-03-2002 14:37:15  
Andy - My 1950 H came with the flat pistons.



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sod

01-03-2002 18:09:40




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 Re: ?1950 Farmall H in reply to Andy in Ohio, 01-03-2002 14:37:15  
If you use HOT water and solvent, blow it DRY with compressed air. After that you might spray some kind of oil or rust inhibiter right away.
good luck
sod



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