Posted by ScottyHOMEy on June 20, 2010 at 14:08:37 from (71.241.195.135):
In Reply to: Mag vs Dist posted by William D Warringer on June 20, 2010 at 10:35:51:
Good basic question.
Myself I prefer the distinction between battery vs. magneto igntions. Both involve a distributor.
A battery ignition, which might be more familiar if you've worked on cars, draws the electricity for it's spark from the battery. The step up in voltage takes place in a canister-type coil that is external to the distributor. The distributor itlesf, as it would appear on your H is little but a housing, mounted so that it can rotate for the purpose of timing things up, that is litle more than a geared shaft that gets the rotor that distributes the spark at the proper time to the correct cylinder on the motor.
A magneto is entirely independednt of te battery, and might best be considered as a two-stage affair. On your H it will be one assembly. The magneto portion of it is what generaes the spark. Basically a magnetized shaft spinning inside a magnetized field (hence electricity to generate the spark. The power for the spark is, again, handled by the second part of the assemly, which is nothing but a distributor. On the magneto, the coil is internal.
Both have points and condenser, internal to the distributor on both.
If your tractor has a batery igntion, you should see a distributor and, nearby, a canister that is the coild. There should be a battery supplied wire from your ignition switch to the coil, and between the coil and distributor, one small wire , and the larger familiar one running to the center tower on the distributor cap.
Without descending into the muck of the digression down below, the Internationl H4 distributor is easily identified. It will have the familiar distributor cap -- round, one center wire from the coil and four plug wires surrounding it, with the whole works centered on a rotating neck. The H4 will also have a distributor cap of teh same stayle, but instead of the rotating neck will have a slab sided body, with another roughly rectangular cap made of the same stuff as the distibutor cap, with the coil wire running from the end of it to the center of the distributor cap.
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