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Farmall & IHC Tractors Discussion Forum

Timing a H4 Magneto

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11-30-2019 11:32:20

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I posted a while back that my H Snow Plow tractor just died, well I replaced the condenser and have good spark out to the distributor cap. Now for the timing. I have #1 cylinder at TDC and the timing mark lined up. The rotor seems to be slightly off #1 on the cap.
Could I possibly have the mag off by 180 degrees? It is back firing big time.
Tried moving the Mag in both directions and either nothing or big backfire?
Thanks Guys..

As you can see I have a red mark at 2 oclock but the rotor is pointing at 3 oclock and the #1 cyl. is at TDC any ideas?

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11-30-2019 19:37:47

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 Re: Timing a H4 Magneto in reply to wijay, 11-30-2019 11:32:20  
Swap 1&4 wires also 2&3 and try again.

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12-01-2019 08:43:02

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 Re: Timing a H4 Magneto in reply to teddy52food, 11-30-2019 19:37:47  
I have the wires on the cap running clock wise #1 #3 #4 #2 which is the firing sequence, why do you suggest swapping wires?
Thanks Ted

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12-01-2019 10:38:44

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 Re: Timing a H4 Magneto in reply to wijay, 12-01-2019 08:43:02  
Try it. Instead of backfiring, it may run!

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12-01-2019 13:48:12

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 Re: Timing a H4 Magneto in reply to teddy52food, 12-01-2019 10:38:44  
Thanks my friend..swapped them and it fired right off, it actually ran pretty smooth. So did I install the mag off 180?
Take the mag and turn 180?

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12-02-2019 05:49:02

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 Re: Timing a H4 Magneto in reply to wijay, 12-01-2019 13:48:12  
Yes it was off. If it runs good now leave it until you need to take it off again, then try to get it right.

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11-30-2019 12:34:44

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 Re: Timing a H4 Magneto in reply to wijay, 11-30-2019 11:32:20  
"I have #1 cylinder at TDC and the timing mark lined up."

Are you SURE you have #1 at TDC at the end of the compression stroke? If you didn't verify that by rocker arm position or putting a finger OVER the #1 sparkplug hole and noting air being forced out as the piston came up to TDC you very well may be 360 crank degrees/180 rotor degrees "off".

Did you note rotor position BEFORE pulling mag?

Also, did you by any chance remove the 2 screws and cover behind the rotor and get the rotor "out of time" with the mag?

Complete H4 mag repair, rotor timing, and mag timing instructions can be found at the link below.

You will have to copy it and paste it into your browser, as it won't work here as a clickable link.


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