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Farmall & IHC Tractors Discussion Forum
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help ! with farmall (h) valves

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Jonathan Mirgon

03-02-2004 15:20:34




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I have a 1942 (h) that I need to order new valves for. someone has ground off the casting number on the head all that I can read is : 3#####-r1. The valves measure 5 an 3/8 inches. my books only list this length valve for a head with casting number 8043d ? which is a high compression head. help !!




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rustyfarmall

03-03-2004 05:26:31




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 Re: help ! with farmall (h) valves in reply to Jonathan Mirgon, 03-02-2004 15:20:34  
If the head was cracked at some point in its life, and repaired at a cylinder head shop, the original number would have been wiped out, because of the repairs done in that area. Usually when this happens, the casting number, 8043, or whatever will be stamped into the head in a different area, usually on the outside of the head, not under the valve cover. The 8060 head on my M has been done this way. Look elsewhere on the head for the number.

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Jonathan Mirgon

03-03-2004 05:57:39




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 Re: Re: help ! with farmall (h) valves in reply to rustyfarmall, 03-03-2004 05:26:31  
Thanks for your help, Your information was extremely helpful !



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riverbend

03-02-2004 18:40:33




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 Re: help ! with farmall (h) valves in reply to Jonathan Mirgon, 03-02-2004 15:20:34  
After 60 years your tractor might have a different head. I think that the 3#####R heads were used on later Hs with longer valve stems.

Are your valve guides shot ? If they are okay, the valve adjusters were not maxxed out (at one end or the other), and the springs are not coil bound at full lift, new valves of the same length will work. If any of the above are the case, longer valves might work better. It will be hard to tell for sure.

The geometry of the valves is not too critical except for the life of the valve guides. If the push rod or the valve is too long or too short, the rocker pushes the valve to one side, and that wears out the guides. Even at that, in these motors, everything is moving pretty slow.

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