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Farmall & IHC Tractors Discussion Forum
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Georgeky.... Have you figured this out?

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CityBoy-McCoy

01-02-2008 05:09:55




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George (or anyone):
Have you ever come up with a COLD valve lash adjustment measurement, which you feel is equivalent to .017 hot, for the H's, M's, etc.?
mike durhan




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SD FARMALL

01-02-2008 18:41:04




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 Re: Georgeky.... Have you figured this out? in reply to CityBoy-McCoy, 01-02-2008 05:09:55  
I just finished setting mine two weeks ago when i put the engine on the tractor, i also couldn't find a cold setting my shop was about 70 deg and i set them at the hot setting and had no trouble after running the tractor for two hours i had to adjust one valve.



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James Williams

01-02-2008 10:00:19




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 Re: Georgeky.... Have you figured this out? in reply to CityBoy-McCoy, 01-02-2008 05:09:55  
I always heard .oo2 difference between hot and cold

jimmy



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georgeky

01-02-2008 08:24:20




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 Re: Georgeky.... Have you figured this out? in reply to CityBoy-McCoy, 01-02-2008 05:09:55  
HI Mike, and no I always adjust mine the wrong way. I adjust them hot while running at normal operating temp. I have heard folks say .020 cold, but I have never tried it.



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Bob Kerr

01-02-2008 08:42:40




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 Re: Georgeky.... Have you figured this out? in reply to georgeky, 01-02-2008 08:24:20  
Hi George, Dad always adjusted them running (idling)and hot. He did so many of them, possibly thousands, you get a feel for it. I do it myself now, but the first ones I did I rolled the engine over by hand.



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georgeky

01-02-2008 12:28:39




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 Re: Georgeky.... Have you figured this out? in reply to Bob Kerr, 01-02-2008 08:42:40  
Bob, thats how my dad always done it, and I learned most of what little I know from him and gramps.



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Bob Kerr

01-02-2008 07:43:47




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 Re: Georgeky.... Have you figured this out? in reply to CityBoy-McCoy, 01-02-2008 05:09:55  
Dad always told me it is better to hear the tappets click than not hear them. Steel pushrods expand(Get longer)more than iron engine blocks. That is why they have a hot spec. If pushrods were made from cast iron, I think you could set them at a cold spec. If steel pushrods are set at a spec cold , it would depend on ambiant temp which varies greatly and adds or subtracts to the lenght of the pushrod so it would be tough to come up with a "set" temp for adjusting the valves. The hot spec is so the metal is already expanded at working temp where it will be running at most of the time. Too much gap will not let the valves open all the way and lose power and set too tight will let the exhaust pass by the valve and burn them and also may make it harder to start from loss of compression and from sucking exhaust gas back in when it is supposed to be sucking gas mixture in, less mixture= less power. It is possible to set valves at a cold spec, but you would have to figure ambiant temp, running temp, steel expansion and contraction rates and the engine block expansion and contraction. Much easier to just do it when all expansion is done and not burn valves up and have to pull the head off and replace parts.

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GordoSD

01-02-2008 06:02:31




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 Re: Georgeky.... Have you figured this out? in reply to CityBoy-McCoy, 01-02-2008 05:09:55  
I read several articles that discussed valve lash setting. The term 'warm' was used. This was further described as ambient warm, as in a nice summer day. Engine probably 80 degrees. The engine doesn't have to be hot, just shouldn't be cold as outside at 20 degrees. Those pushrods and valves aren't going to vary in length much between 80 degrees, and 'hot' 160 degrees or so. Gordo



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