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Calling H magneto Experts - Hey Red!
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Posted by BTD on September 13, 2001 at 11:11:24 from (192.132.24.66):
I need to tap some wisdom in timing the magneto on an H. Here is the procedure I am following, gleened from past posts, the Antique Tractor Bible, and ATIS. I am now thinking of seeing if a "Magneto's for Dummies" book exists. 1. bring cylinder one (closest to radiator) to TDC (using thumb over plug hole to verify compression stroke) lining the first of the pair of marks on the main pulley with the indicator pin. The main pulley has three marks, a lone mark is separated from the first pair and doesn't seem to correspond with anything.
2. Rotate the magneto so that it has just clicked and the rotor brush is directly under the pin for cylinder one, to simulate the mag just firing for cylinder one at TDC. Hopefully the driven lugs on the magneto match the drive on the tractor, I have had to monkey with the rotor drive gear to get this, I think I'm going to regret that action.
3. Install magneto with the body of the magneto as close to the engine block as possible.
4. The instructions I have say to rotate the engine one complete revolution to TDC of the next cylinder in the firing order, for my H that would be cylinder three. (One set of instructions I have says this is indicated by bringing the main pulley once around to the first of the pair of marks again.) Unfortunately, the magneto clicks before I get that far around. So when I get to that postion, I rotate the magneto away from the block hoping for the click that tells me I have the magneto timed. I have never got the click. Not even close. When I got this mag to run the engine before I must have just lucked out. I must be doing something wrong. My instructions manuals for my M differ enough not to be very helpful. How should I be interpreting those marks on the main pulley? I had to take the magneto off to give it a tune up and swap some parts. Now the thing gives great blue sparks and sends a jolt up to my shoulder if I hold it wrong! -Thanks for the help! BTD
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