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Farmall & IHC Tractors Discussion Forum
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Overhauling M engine

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Carwilly

12-29-2006 05:38:19




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I"m getting ready to pull the engine off my "47 M and going to have a friend who works at local JD dealer work it over for me. Just wondering if anyone has any secret tips for us or if there is any type of checklist that anyone follows while overhauling an engine.




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John M

12-29-2006 14:10:50




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 Re: Overhauling M engine in reply to Carwilly, 12-29-2006 05:38:19  
Dont let a John Deere mechanic work on it! Itll come back only running on 2 cylinders!:0)



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NDS

12-29-2006 09:24:49




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 Re: Overhauling M engine in reply to Carwilly, 12-29-2006 05:38:19  
These old engines will let you get away with more than modern engines, Dad ran Hs and Ms over 40 years (also had newer diesel tractors) and have seen him overhaul lots of engines in tractor shed using common sense as to what needed to be done. Head always went to machine shop and usually he put in sleeves and pistons but, if crank, cam, etc. passed visual check nothing was done to them. When the Ms were main tillage tractors they were often run 16 to 24 hours a day for couple of months when preparing land and overhauled engines usually lasted about as long as original new engine. Contrary to what many on forum seem to think 3 to 5 years 3K to 5k hours was pretty good life span for hard working gasoline engine in those days. 3K to 5K hours would be eqivalent to 1k to 2K miles on car and VERY few car engines ran that long in those days.

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El Toro

12-29-2006 06:27:53




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 Re: Overhauling M engine in reply to Carwilly, 12-29-2006 05:38:19  
Rusty has covered this very well. You should install new cam bearings or have them installed
at your local auto machine shop. Be careful when splitting that tractor. You need equipment to safely split the tractor and for supporting it.
Hal



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RustyFarmall

12-29-2006 06:10:16




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 Re: Overhauling M engine in reply to Carwilly, 12-29-2006 05:38:19  
Those old Farmall engines are about as straight forward as they come. All of the rules for rebuilding any engine will apply. The engine should be fully disassembled and all parts inspected and measured with a micrometer. These measurements should then be compared to the original factory specs. Anything that is out of tolerance should be either replaced or machined back into tolerances. Do not take any short cuts. Short cuts will be regretted later.

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