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Farmall & IHC Tractors Discussion Forum
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Timing marks on Farmall H

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PA Steve

11-24-2004 10:43:28




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There are two marks on the crankshaft pulley that are just a few degrees apart when the #1 piston is at TDC. Which mark is TDC and how far advanced/retarded is the other mark? Also, with centrifugal advance, the timing should be advanced a certain number of degrees at a particular RPM. What are these specifications?
Thanks for the help,
Steve




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Wayne Swenson

11-25-2004 13:38:16




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
The single mark is the first one you see on the pulley while rotating the crankshaft; it indicates the limit of timing advance when the engine is running. (timing advance means the spark occurs earlier hence the mark is placed on the pully BEFORE TOP DEAD CENTER)
The next set of marks are the actual TDC (top dead center) marks. There are 2 marks about 1/8 " apart that locate where the mag or distributor should fire when cranking the engine.

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PA Steve

11-25-2004 12:46:37




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
Thank you for all the information. I set the timing by ear and it is running pretty well. I'm going to put the light on it to check that the advance is working properly.



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John *.?-!.* cub owner

11-24-2004 14:06:33




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
I hate to disagree with the other posts, but the second mark is top dead center when turning the pulley in the cranking direction. The first one is the Before TDC mark for checking timing with a light.



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CNKS

11-24-2004 18:55:47




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 Re: Timing marks on Farmall H in reply to John *.?-!.* cub owner, 11-24-2004 14:06:33  
What you say makes sense but that's not what the manual says -- it says the 1st mark. Page 42, fig 42A in the H operators manual. I had to go freeze my patoot off to go look at mine so that I was positive which way the crank turned.



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CNKS

11-24-2004 13:26:36




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
The TDC mark you want on the crankshaft for static timing is the first one (in the direction of crankshaft rotation). The crude way to see if the advance is working is to use a timing light and see if the marks move as you accelerate. The I&T manual says full advance is 40 degrees BTC for a distributer. If you have a mag, the "magneto running timing" is 35 degrees BTC. No rpm is specified, but since the book says "full advance" I suppose if you get that advance at, say, wide open throttle, you are ok. Chad or someone else can explain what I can't. I have never checked anything but the static timing, just quoting the book.

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CNKS

11-24-2004 13:33:00




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 Re: Timing marks on Farmall H in reply to CNKS, 11-24-2004 13:26:36  
Another thing: These engines seem to run a little better when timed by ear, of all things. Set the static timing to specs, then with the tractor fully warmed up, advance or retard the distributer to max rpm. If the engine sounds like it is straining, you are retarded too far. If it pings under load you are too far advanced. Not very scientific, I realize.



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Andy Martin

11-24-2004 13:11:00




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
The first of the two marks is TDC which is where the engine is to be timed statically. IH did not give instructions for timing with the engine running.

When timed right, with the engine not running, the distributor should fire as the first mark passes the timing indicator. I think the magneto should trip on the second mark (to prevent kickback) but I'm sure someone will correct this if it is wrong.

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ChadS

11-24-2004 11:24:46




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 Re: Timing marks on Farmall H in reply to PA Steve, 11-24-2004 10:43:28  
If you have the engine torn down far enough to remove the cam, If the head is off, center the #1 piston at top dead center, then, the camshaft timing, there are two marks on the gear, one for the crank, and one for the distributor. Best advice for which timing marker is which, and knowing its correct, is to install #1 lifters in the block, they both should be down, or valves closed, if you have the piston all the way at the top, the cam in the right place, the markers should be darn near close enough to recognize as to where, and which one is which. Look up at where the distributor would mount up, there should be a mark there, and one at the crank. As for the mechanical advance, and timing, follow the book specs on the timing, and make sure the advance mechanism is not stuck, or sticking. If they are, that robs the throttle response from the engine idle to full throttle. Hope this helps a bit. ChadS

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