H4 Mag overhaul

Farmall Super A, AV, 100, 130, & 140 1939 - 1973

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mgwolfe
Posts: 2
Joined: Mon Jun 06, 2016 11:57 am
Zip Code: 36353

H4 Mag overhaul

Postby mgwolfe » Mon Jun 06, 2016 12:07 pm

I have an H4 Magneto that I have been working on to get it cleaned up. When I took the gear timing cover off the larger one that the rotor goes on moved. I thought i put it back in the right place but apparently not. I put it back on the tractor and it gets a good spark. Just not at the right time. I saw one tooth on the smaller gear that is marked but nothing on the larger one. Any help would be appreciated.

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havoc1482
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Re: H4 Mag overhaul

Postby havoc1482 » Mon Jun 06, 2016 5:08 pm

Get the engine at Top Dead Center on the Compression stroke for Cylinder 1. Keep moving the gear until it makes the rotor line up at cylinder number 1 plug wire.

The plastic keyway that the rotor slides onto should have two marks on it. Line up the "R" with the mark on the smaller gear.

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mgwolfe
Posts: 2
Joined: Mon Jun 06, 2016 11:57 am
Zip Code: 36353

Re: H4 Mag overhaul

Postby mgwolfe » Tue Jun 07, 2016 8:23 am

Thanks for your answer. I will get it back together today.


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