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Farmall & IHC Tractors Discussion Forum
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seat;---3 way grind? and other questions

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shoo_giesty

01-23-2007 05:36:39




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i remember a post about this but cannot find it. i am having a head done for an Farmall A (casting 6716-db)and i would like to give it a try. previously an untouched head am i safe to take .025 to .05 off the head.


currently doing a complete overhaul on motor and was looking for another 5 to 6 hp as the tractor runs hay wagons back and forth from the hay fields to the barn. (its an overbore kit)

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RustyFarmall

01-23-2007 06:56:11




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 Re: seat;---3 way grind? and other questions in reply to shoo_giesty, 01-23-2007 05:36:39  
Milling the head will result in more compression, which in turn will make more power, but I am a firm believer in never removing any more than is necessary to give a good flat and true surface. Remember, any material that is milled off can never be put back on, and if too much is removed, the head becomes nothing more than a paper weight, and those heads are not being made anymore.



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K-Mo

01-23-2007 06:45:32




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 Re: seat;---3 way grind? and other questions in reply to shoo_giesty, 01-23-2007 05:36:39  
Have you considered the weight of your load versus the weight of your tractor.
When I was about six years old, I was pulling a load of oats with a Farmall B onto the road up a slight incline. A car was coming so I stopped. Once I lost the momentum of the load, I was dragged backwards with the wheels locked and sliding.
One of my references list a Farmall A at about 2000 lbs. Around here what we call a hayrack would maybe weight 1200-1500 lbs empty. If you want to keep control, your tractor needs to weight more than your load and consider the momentum of a moving load.
Be careful.
K-Mo

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Janicholson

01-23-2007 06:25:39




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 Re: seat;---3 way grind? and other questions in reply to shoo_giesty, 01-23-2007 05:36:39  
Rusty is correct. The seat angle should be set to one degree more than the valve face angle. This results in the first line of contact being at the perimeter of the seat. This provide a ring contact resulting in an immediate seal at that point.
The point of contact on the valve face should be near the outer 1/5th of the face, but not at the edge. the last grind should be the top cut on the seat. All valves should have a margin (edge thickness) of at least .050" this reduces the temperature and prevents early overheating. JimN

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RustyFarmall

01-23-2007 05:47:40




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 Re: seat;---3 way grind? and other questions in reply to shoo_giesty, 01-23-2007 05:36:39  
If you are having the work done at a professional shop, my guess is that you will get the best job they know how to do, which is probably the multi-angled job.



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