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Farmall & IHC Tractors Discussion Forum
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Farmall H woes

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PA Steve

10-15-2004 06:56:09




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I'm working on a Farmall H that has not run well for a long time. I think the problem is isolated to improper valve timing. My father and I determined that all valve openings and closings were advanced approximately 20 crankshaft degrees. Because of this, we thought that the camshaft gear must be incorrectly aligned to the crankshaft gear. When the timing cover was removed, we found the marks on the camshaft and crankshaft gears correctly matched. Is it possible that the marks on the camshaft or crankshaft gears are incorrect? If so, what is the correct setting? The tractor is a 1942 model, serial # 101071 X3
Any help or advice is greatly appreciated.

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EricB

10-18-2004 06:31:31




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
You have said the engine used to run Ok a long time ago. That would tell me nothing has happened to the gear/tooth placement. My guess from the description of "not running well" is a problem with the values. Rain will come down the exhaust muffler and corrode out the manifold as well as run back into the cylnder head and damage the values. It can also run down into the engine and rust out the cyliner walls and seize the rings. Uncovered mufflers is the greatest cause for valve jobs. Test your compression.

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El Toro

10-16-2004 06:51:36




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
Hi, Rotate the engine until No1 cylinder is coming up on compression until it is at TDC. Check the valves on No1 cylinder, both should be closed. If they are closed, look to see where your rotor is pointing. Some have claimed there's
been a problem with woodruff keys shearing on these tractors. It may have only partially sheared the key to throw the valve timing off.
You may have to pull that cam gear and examine
the key and keyways for damage. Ford cars had
plastic timing gears in th 70's and were bad for breaking. Good Luck, Hal
PS: Post what you find.

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John *.?-!.* cub owner

10-15-2004 19:12:22




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
According to the I&T IH-150 manual turn the engine until the #1 exhaust valve is closing, and the #1 intake valve just starts to open (just enough to take up the slack). The second notch on the crank pulley should be witin 1/8 inch either way of the pointer. It doesn't say how to check it if you have only one timing notch.



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JBlavl

10-15-2004 08:27:42




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
Something that happened to me was once upon a time some back yard mechanic decided to add additional punch marks of his own on the cam and crank gears. So when I went to put it back together I had a heck of a time figuring it out. You don't have more then 2 sets of punch marks on your cam gear do you?



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JT

10-15-2004 08:09:43




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
If the engine is out of valve time, then engine would not run at all, not just run bad. Off one tooth will make it pop and backfire through carb or exhaust. It sounds as though the engine needs a good tuneup, clean carb, points, condensor, cap, rotor, plugs, plug wires, etc. How did you determine the valves were advanced 20 degrees???
The best way to tell if the valves are in time is to take off valve cover, get piston to top dead center on compression stroke and then both valves should closed. If you moved on way one valve should rock open and the other way it should rock open the other way. Hopes this helps you a little, but before you go diggin past the problem looking for something else, look at the simple things first.

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Bob M

10-15-2004 07:48:27




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
Could be the half moon key in the cam drive gear hub has sheared letting the gear "walk around" on the camshaft. When this happens the cam gear will still be correctly timed with the crank, but the camshaft will not be.

I've run into sheared camshaft keys several times on tractors that drive a live hydraulic pump from the cam gear (Super M, 400, etc). However if the cam hub nut was not properly tightened I suppose the camshaft key could shear on a tractor without live hydraulics like your '42 H.

Suggest you remove the cam hub nut then peek down the keyway for evidence of a sheared key.

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Novel Idea Guy

10-15-2004 07:42:24




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
If it ever ran well, the likelihood of it being valve timing is EXTREMELY remote. Valve timing doesn't just change on a whim.

The other guy is right. Those valves should be opening slightly ahead of the arrival of the piston.

If you could explain what "not running well" means, someone might be able to tell you what to look at.



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EricB

10-15-2004 07:09:22




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
Remeber Value closing and firing timing are two different things. The values have to be closed to start compression and well before the ignition fires.
I would be very reluctant to tamper with the cam shaft. Have you timed the ignition with a timing light?



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kfox

10-15-2004 07:03:14




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 Re: Farmall H woes in reply to PA Steve, 10-15-2004 06:56:09  
PA Steve, If you have a boneyard handy, I would get a set of timing gears off another H and compare the marks. You never can tell what someone has done to your tractor over the years.
A set of gears shouldn't cost very much. ken



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hinchley

10-15-2004 10:20:01




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 Re: Farmall H woes in reply to kfox, 10-15-2004 07:03:14  
Check your timing. If you have a magnito there is a specific way of insalling it and checking your timing,Hope this helps.



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