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Farmall & IHC Tractors Discussion Forum
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timing a H

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stevex

07-14-2007 13:39:00




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Im trying to set the timing on my H. I only see one notch on the pully. Am I missing something?




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CNKS

07-14-2007 19:10:25




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 Re: timing a H in reply to stevex, 07-14-2007 13:39:00  
Provided you did not remove the mag and it was in time before you messed with it:---Loosen the mag and put the top of the mag against the block. Pull the #1 plug, put your finger in the hole and hand crank until you feel compression. Then continue to crank until the marks are lined up. Then slowly pull the top of the mag away from the block until the mag trips. You are now in time. If not you have worn parts inside the mag. If you removed the mag and don't remember how it was set before removal, the procedure is the same, except that you turn the drive until the rotor points to the #1 terminal, install with the top of the mag against the block and pull out until it trips.

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Wayne in MN

07-14-2007 16:40:09




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 Re: timing a H in reply to stevex, 07-14-2007 13:39:00  
First, make sure the timing is set correctly. Late timing (too small of a gap or incorrect setting) will act like too rich carburetor problems.
Timing should be set so the points open (set the gap first, .016" for battery ignition) when the timing pointer is between the double marks on the pulley; use the crank or turn the fan by hand (switch off) to locate the marks. With the switch off; use an ohmmeter or self powered test light to verify the point opening instant. This can be done with either #1 or #4 at TDC. Loosen the 2 distributor hold-down cap screws and rotate the body of the distributor in the direction of normal rotor travel until the points are closed (test light is on, ohmmeter reads very low ohms). Now rotate the distributor body backwards until the points JUST open; lock the cap screws and you are good to go. It is CRITICAL for the points have to be CLEAN and ADJUSTED first. If you have a 12 volt test light, turn on the switch after locating TDC and follow the same procedure. The light is on with points closed and off when the points open.
Needless to say, points, rotor, cap, & wires have to be in decent shape.

Now start the engine & warm it up in NEUTRAL and BRAKES LOCKED; run at WOT (wide open throttle) and turn the high-speed adjusting screw in & out to find the "sweet spot" where the engine runs its fastest & smoothest. Turn this high-speed screw out an extra 1/2--3/4 turn for power. Idle the engine down & set the idle speed. Now turn the idle mixture screw in to richen, out to lean so the idle is smoothest (this is an AIR adjusting screw so works opposite of the main fuel screw on the bottom of the carb). Re-adjust the idle speed. Perform the carb adjusting procedure another time to be sure all mixtures are correct.
Don't forget that in the winter your air cleaner may cause richness due to cold oil in the cup or even ice blocking the air passage.

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El Toro

07-14-2007 13:56:01




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 Re: timing a H in reply to stevex, 07-14-2007 13:39:00  
According to my manual the late H's had one notch on the damper pulley. Hal



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stevex

07-14-2007 14:12:23




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 Re: timing a H in reply to El Toro, 07-14-2007 13:56:01  
By serial number this is a 1940 model. Was that considerd late?

Even then, I set it using the notch and still cant get it started sp there must be something else I need to look for. Most I got was a half hearted back fire.



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El Toro

07-15-2007 05:35:46




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 Re: timing a H in reply to stevex, 07-14-2007 14:12:23  
Has the engine ever been running since you've had the tractor? You need to make sure you are on the compression stroke and when No1 piston is at TDC. There can be no guess work. Get a helper to hand crank the engine while you watch the screwdriver rise. When it quits rising your piston should be at TDC then look at the rotor to see where its pointing. Make sure your plug wires are installed on the cap in this order.

2-1
4-3

Hal

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stevex

07-14-2007 14:30:39




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 Re: timing a H in reply to stevex, 07-14-2007 14:12:23  
The problem is the magneto is out of time with the engine. My fault, but it is out of time.

I put a piece of tissue in the #1 plug hole, then cranked till it blew out. The notch was at a right angle (90 degrees) to the top of the pulley.

I continued to crank until the notch was at the marker alongside the top of the pulley.

I lined up the rotor in the #1 firing position, or as close as I could get eyeing it.

put the cap back on and tried to start it.

Thats is were I am now. I have repeated the procedure several times with no change.

What am I doing wrong or what am I missing.

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El Toro

07-14-2007 16:04:29




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 Re: timing a H in reply to stevex, 07-14-2007 14:30:39  
You need to hold your thumb over No1 plug hole while someone slowly hand cranks the engine until you feel compression against your thumb. Then drop a large handle screwdriver into the cylinder and big enough so it won't fall into the engine.

Have someone to slowly keep hand cranking the engine as you watch the screwdriver rise. When it stops rising look to see where if the pulley notch and pointer are aligned. If they are remove the cap from the mag and see where the rotor is pointing. It should be at the No1 plug tower. If its off you need to pull the mag and turn the rotor to the No1 position that should be be aligned with your No1 plug wire on the cap.

The plug wires should be in this firing order. Hal

2-1
4-3

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El Toro

07-14-2007 14:21:05




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 Re: timing a H in reply to stevex, 07-14-2007 14:12:23  
You need to pull No1 sparkplug near the radiator and bring that piston to TDC on the compression stroke. Then take a look at the rotor to see where its pointing. Hal



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