Farmall H Magneto Timing

Reinders · Jan 20, 2014

I am to the point of timing the magneto and while I was in the middle of it I has one of those "Oh Crap" moments. I set the timing marks on the cam/crankshaft when putting the engine back together. My question is "Are there timing marks on the governor and magneto gears that I forgot to line up and set?" If so, then back to square one and taking the front cover off again. Thanks!

Reinders · Jan 20, 2014

From what I am seeting with older posts is that there is a timing mark on the Magneto gear. I missed that (sorry, first farmall rebuild). My question is what are my options for getting that Mag gear timed? Do I have to remove the front cover? Hopefully not. Also, was there a timing mark on the governor gear that I missed?

Zachary Hoyt · Jan 20, 2014

I can't advise about removing the cover or not, but I am guessing that the mark would be on the back side of the gear so it could be seen when bolting up the mag drive. The governor is not timed as far as I know, it is not doing anything that requires timing as I understand it.
Zach

Reinders · Jan 20, 2014

That is what I thought too about the governor. I was pretty certain that it didn't have a mark. But when setting the magneto, it just didn't feel right and that is when I was thinking about the timing mark. I will take off the housing and look for a mark. It would make sense that they put a mark on the baskside of the gears. Let's hope that is the case. Thanks.

Bob · Jan 20, 2014

If the crankshaft-to-camshaft timing is correct, you don't need to worry about the timing marks on the mag drive.

With the crankshaft at #1 TDC, simply mesh the gears so the mag drive slot is like this "/", probably between the one and two o'clock position, and install the mag.

With the slot set like that, there should be enough adjustment in the slots to set the mag to impulse at or just after TDC.

If NOT, you may have to move the gear mesh one tooth in the direction required.

Reinders · Jan 20, 2014

Ok that works. Having never done this before, I watched a youtube video on how to time the magneto on a Farmall Cub. I would assume it would be the same on an H minus the firing order could be different. I attached the URL to that youtube clip in case anyone was interested. If anyone wants to offer more advice, if you watch this just let me know if it would be the same process for an H.
Timing a Cub Mag.

teddy52food · Jan 20, 2014

There isn't much adjustment on the mag. If that gear is off a couple teeth you will have a problem.

Bob · Jan 20, 2014

There's detail instructions on pages 43 and 44 of the official IH mag manual at the link below.
GSS 5035

Reinders · Jan 20, 2014

Got it. I have it timed now and it seems to be working. I needed to take the magneto gear off and shift the teeth a little. I didn"t have to match up timing. Seems to be working just fine with the notches on the front pulley. Thanks for all the help.

El Toro · Jan 20, 2014

Remove No1 spark plug near the radiator and bring that piston to TDC on the compression stroke. Then remove cap on mag and see where your rotor is pointing. It should be at the No1 plug tower that's about one o'clock. If it's way off you need to pull the mag and rotate the rotor to the one o'clock then reinstall it. It should be pointing to your No1 plug wire tower on your cap. Hal

gene bender · Jan 21, 2014

There is lots of things that can make the mag out of time one is the mag gear that runs off the cam other one is the gears that turn the rotor in the mag itself all need to be correct if you want the engne to run.

Farmall H Magneto Timing

Reinders

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Zachary Hoyt

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Reinders

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Bob

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Reinders

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teddy52food

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Bob

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El Toro

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gene bender

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