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Farmall & IHC Tractors Discussion Forum
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Do I need to adjust my valves on an H?

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John

04-02-2004 15:11:48




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My H runs very well, I was wondering if I need to adjust the valves? If so, I know that they must be set hotbut by the time I would get everything off they would be cold. Thanks.




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Ron

04-03-2004 07:23:37




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 Re: Do I need to adjust my valves on an H? in reply to John, 04-02-2004 15:11:48  
The problem with smaller tappet clearances is with the "Seat Timing" of the valve.. The closer the tappet clearance, the LESS time the valve has to COOL..!! This is called "Tight Valves"..!! Valve tapet clearances get tighter, as the engine warms up (in most push-rod engines). Cold, you should set them a couple of thousanths looser..



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Will Sick

04-02-2004 21:14:01




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 Re: Do I need to adjust my valves on an H? in reply to John, 04-02-2004 15:11:48  
If the valves are loose you can hear the valve tappets clicking quite loudly. If the click is moderate it's okay.I set the valves cold to .019 and it works okay.



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Zak

04-02-2004 19:49:43




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 Re: Do I need to adjust my valves on an H? in reply to John, 04-02-2004 15:11:48  
"My H runs very well" Ok, not to sound negative, but why would you adjust anything that runs well? I've been there many times and tinkering with what ain't broke can take ya down a very long road! If you had a skip in the idle, or poor starting running whatever, then maybe you'd want to poke around. Don't go fixin' what ain't broke! Zak



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Jon with an H

04-02-2004 17:40:34




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 Re: Do I need to adjust my valves on an H? in reply to John, 04-02-2004 15:11:48  
I always adjust valvs cold and carbs hot. Seems to work fine.



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bigrerddm

04-02-2004 16:19:58




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 Re: Do I need to adjust my valves on an H? in reply to John, 04-02-2004 15:11:48  
I set mine at .017 like the book states to. and it wasn't hot. still runs fine.



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CNKS

04-02-2004 19:37:41




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 Re: Re: Do I need to adjust my valves on an H? in reply to bigrerddm, 04-02-2004 16:19:58  
If you set them 0.017 cold, that probably means they are 0.015 hot, not closing fully and "may" burn sooner.



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Ron in Nebr.

04-03-2004 00:53:59




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 Re: Re: Re: Do I need to adjust my valves on an H? in reply to CNKS, 04-02-2004 19:37:41  
Not wanting to start an argument here, but if the valves are at .015" hot and they're supposed to be at .018" hot, they're still closing fully. They'd still be closing fully if they only had .005" hot clearance. As long as there is clearance between the rocker arm and the valvestem when the cam is on the base circle, the valves are closed. The deal is, they won't be closed for quite as long of a time, and, more importantly in some cases, they will be opening farther. Some engines have very little clearance between the valve and the piston at full valve lift and it doesn't take much over specs to have them touch and bend the valve. Doubt the H's were that close, but it's still best to set them to specs(either right on for hot or add .002" for cold. A good way to set them "hot" and be able to have the temp right is to get everything taken off beforehand and just set the valvecover back on to contain the oil splash, then run the engine with a blanket over the radiator/grill shell so it can't get any air. It'll warm up plenty fast that way and you can get them set/checked before it cools enough to make a difference. Cast iron retains heat for a good amount of time.

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CNKS

04-03-2004 13:06:53




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 Re: Re: Re: Re: Do I need to adjust my valves on a in reply to Ron in Nebr., 04-03-2004 00:53:59  
You are correct -- after I posted I realized I should have said "stays open longer". However,I will quote from Motor "Auto Engines and Electrical Systems": "Before adjusting the valve clearance it is extremely important that the engine be warmed up for about 30 minutes to normalize he expansion of all parts. This is very important because during the warmup period,the valve clearances will change considerably --- Covering the radiator will not materially hasten this normalization process because even with the water temperature quickly raised, it does not change the rate at which the oil temperature increases and becomes stabilized, or the engine parts become normalized." No argument, I remembered reading this the other day when I was adjusting the valves on my Super H. I agree that the metal parts hold temperature for a while, but I'm still not positive mine are right.

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