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Farmall & IHC Tractors Discussion Forum
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H4 magneto question

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Jeff

01-26-2004 15:29:03




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I am tryin to put a condenser and contact in my magneto and i am wondering, how far apart do you set the gap between the contact and that little bracket that comes with it. the IT manual doesn't give a lot of info about magnetos. it does say that point gap is supposed to be .013, is that the gap i am lookin for? also, those little gears that drive the rotor, how do they line up? i see the big one has an R and L and the only thing i can see on the little one is sort of a notch on one of the teeth. last question is what is that little red pill shaped thing that comes with the contact and condenser set from IH? thanks for all the help!

jeff

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Bob

01-26-2004 15:48:51




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 Re: H4 magneto question in reply to Jeff, 01-26-2004 15:29:03  
The point gap is 0.013. You turn the magneto so the moveable contact is on the high point of the cam, and slide the stationary contact up or down until the point gap is at 0.013, and lock down the point. Use a clean feeler gauge, free of all oil, and don't even get oil from your skin on the points by touching them, for longest life.

For the R or L setting, you'll need to post back with the model of tractor the mag is from. I believe most IH mags run RH, but the mag drives on certain engines are exceptions, and turn LH. Actually, you can determine this by holding the mag upright, in normal operating position, and turning the impulse coupling by hand. In one direction, it will "latch", and the impulse spring will begin to wind up. This is operating direction. When turned the incorrect direction, there will be resistance that comes and goes due to the magnets passing the pole pieces, but no "latch up" of the impulse.

If the impulse latches when you turn the mag clockwise (with you facing the drive coupling), the mag is RH, so set the beveled tooth to match the "R" mark, and obviously if the opposite is true, use the "L" mark.

In either case, you line up the L or R, whichever is appropriate, with the notched tooth on the little gear.

The "little pill" contains cam lubricant for the cam that operates the points. I can't recall if these have a wick that rubs on the cam, if they do, put a reasonable amount of the lube on the leading edge of the wick, so as the cam turns in it's normal direction, it will pull some of the grease under the wick, and keep the cam lubed. If no wick, put a SMALL amount on the fiber rubbing block on the moveable contact arm, that contacts the cam.

I hope I got the R and L correct, and I'm sure someone will correct me if I'm wrong!

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Jeff

01-26-2004 20:16:16




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 Re: Re: H4 magneto question in reply to Bob, 01-26-2004 15:48:51  
Thanks for the info. The tractor is an H. I have been trying to figure out which way it rotates. Are you saying that when i rotate the impulse, it will either keep going in one direction and stop in the other. when i turn it in the direction that allows it to keep moving and clicking the rotor turns backwards, in other words it turns clockwise if you are standing at the front of the tractor looking back. that seems to be wrong to me because it would have the firing order backwards. anyways, thanks again for the help

jeff

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Bob

01-27-2004 06:03:45




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 Re: Re: Re: H4 magneto question in reply to Jeff, 01-26-2004 20:16:16  
For determining mag rotation, you go by the direction the drive coupling turns, NOT the direction the rotor turns, which will be the opposite.

Your "H" mag is RH, so use the "R" mark to time the little gears.

Starting at the post labelled #1, arrange your spark plug wires in firing order around the cap in a CCW direction.



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Wayne Swenson

01-27-2004 08:04:33




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 Re: Re: Re: Re: H4 magneto question in reply to Bob, 01-27-2004 06:03:45  
I do believe that the wires are routed CW direction (looking at the mag from the driver's seat) and the rotor turns in the Right-handed, CW, direction so that is why you line up the R mark with the notched tooth.
If you look at the mag from the drive coupling end everything is backward.



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Bob

01-28-2004 09:39:12




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 Re: Re: Re: Re: Re: H4 magneto question in reply to Wayne Swenson, 01-27-2004 08:04:33  
If you were to order a replacement mag, you go by the DRIVE COUPLING END Rotation, NOT the direction the rotor turns. Don't blame me for this, it was the way the whole mag industry spec'd things, and also when aligning the gear tooth timing marks, you go by the direction the DRIVE COUPLING rotates.

However, when arranging the spark plug wires, obviously you do that in the direction the ROTOR turns AS I STATED IN MY POST.

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