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Farmall & IHC Tractors Discussion Forum
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cold valve lash on super h

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jcarter

11-16-2005 05:41:53




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What works close for a cold valvelash setting when putting a motor together to be safe and close to .017 hot.About .013-.014?




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robertw

11-16-2005 12:00:36




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 Re: cold valve lash on super h in reply to jcarter, 11-16-2005 05:41:53  
I got a 1953 farmall sh with the orginal manual with it and it said .017 warm i would set them at .020 when you put it back together run a few hrs. and recheck



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Allan in NE

11-16-2005 05:56:10




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 Re: cold valve lash on super h in reply to jcarter, 11-16-2005 05:41:53  
J,

You're thinking backwards. Set 'em at about .020" cold. The gap will close when the engine comes up to tempreature.

Allan



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RustyFarmall

11-16-2005 06:23:28




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 Re: cold valve lash on super h in reply to Allan in NE, 11-16-2005 05:56:10  
Yep, .020 cold, and forget it.



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jcarter

11-16-2005 08:23:28




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 Re: cold valve lash on super h in reply to RustyFarmall, 11-16-2005 06:23:28  
Yea, I like to set them cold and forgetabout them.Doing them hot is a lot messier.I was thinking backwards on this motor.I ran supercharged, alcohol burning aluminum race engines in truck and tractor pulling.I would set intakes,exhaust at .15, .17 cold to get .25 ,.27 hot.Aluminum engine would grow that much when it got to operating temp.



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El Toro

11-16-2005 08:45:58




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 Re: cold valve lash on super h in reply to jcarter, 11-16-2005 08:23:28  
I think you have those settings backwards, you need to set them at .025" cold to get .015 hot & at .027" cold to get .017". You had better check them when hot too. They may be too loose. Hal PS: The clearance usually gets less when hot.



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P and R Pete

11-16-2005 10:49:22




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 Re: cold valve lash on super h in reply to El Toro, 11-16-2005 08:45:58  
Well, this raises a question.

I wondered the same thing for my Super-A. Some guy said, in the middle of a previous discussion about this, that he had an IH manual that said that "warm" meant "anything above freezing". This implies that you can set your valve lash to what the manual states when the engine has not been run, meaning 'cold', (exactly like every car, motorcycle, whatever, I have ever owned).

So, for the hell of it, I called five different IH dealer service-managers and asked. 4 out of 5 said that that was correct, you set the valve-lash to manual-specs with the engine cold.

Why the difference? All i can think, for myself, is that I guess I'd rather have my valves slightly too loose rather than slightly too tight, but this leaves me to wonder why do most of my small sample of dealers dispute the common wisdom?

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El Toro

11-16-2005 14:29:29




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 Re: cold valve lash on super h in reply to P and R Pete, 11-16-2005 10:49:22  
I've set the majority of all valve lash when the engine is cold on an engine with solid lifers.
I have set of clips that you can put on the rockers to keep the oil from splashing all over
with engine running. The V8's are bad for this.
Years ago some engines like the flat head Ford's didn't have any adjusters and you had to grind the valve stems to obtain enough clearance and this was done on a cold engine. This took some
time when doing a valve job. Engines with hydraulic lifters I set them cold too with the engine idiling. Some didn't have any adjustment
you just tightened the rocker arms and that was it. With solid lifers you beed to set them about .003" over what the hot setting is. Hal
PS: Ever has a miss hard to find check valve clearance.

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captaink

11-16-2005 14:10:40




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 Re: cold valve lash on super h in reply to P and R Pete, 11-16-2005 10:49:22  
You've got me curious now. I always set the valves on the letter series and my 282 Diesel after warm up and while running. If my memory serves me right the spec on those engines says Hot.

On the later 414 and 436 engines I think the spec says warm and on those I set the valves on the engine cold, run it for a couple hundred hours and then double check them cold.

I've always been satisfied with the performance.

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RustyFarmall

11-16-2005 12:28:55




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 Re: cold valve lash on super h in reply to P and R Pete, 11-16-2005 10:49:22  
I kinda learned it by trial and error. I rebuilt the head on my 1940 M, and was determined to do it right, by the book. Made an initial setting on the valves, started the engine and let it warm up real good, then shut it off, removed the valve cover, and began adjusting the valves. Got everything right on factory specs. Let it warm up good, took it for a drive, and did not like the way it ran. Did it all over again, still didn't like the way it ran. Shut it off and walked away. The next day I removed the valve cover, set the valves at .020" with the engine cold, buttoned it up and drove it again. It worked. The valve cover has not been off since.

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