OT DU4 mag ?

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Model T Ford Forum: Forum 2017: OT DU4 mag ?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Nevada Bob Middleton on Friday, April 21, 2017 - 05:31 pm:

Working on a magneto had couple ?.
How to remove the points plate?
How to remove the internal drive gears as the timing mark are off one tooth
I got this mag want to clean up and correct these issues


Top of pagePrevious messageNext messageBottom of page Link to this message  By Seth in Alabama on Friday, April 21, 2017 - 06:50 pm:

Hey Bob, first and foremost, DO NOT spin the mag unless it is hooked up to some grounded spark plugs. If spun while not hooked up, the armature inside will fry itself very quickly (within only a few spins) and then the mag has to be rebuilt by a pro. Some terminology: the "front" of the magneto is the drive end. This is where you look from when saying the mag turns clockwise or counterclockwise.



Most of the interesting stuff is on the "rear" of the magneto.



Your distributor plate, the red thing that the spark wires attach to, will come off with either two screws on the far left and right edges or like this earlier one, you squeeze the two levers in from the top and just pull the face away.

Then the black arm is flexible and can be lifted at lightly and rotated out of the way to remove the points cover plate. This is also where the ground wire is hooked up to kill the engine when running.



You now have access to the points. Remove the spark advance arm by wiggling it towards you, that springy arm and cover were the only things holding it in place. A 9/32" socket will remove the long skinny bolt holding the points in place. Most likely they will need some gentle screwdriver persuasion to pop out once the bolt is removed.



A 3/8" wrench or similar size will remove the arm. Then a flat tip for the two remaining screws. The one opposite of the arm is the same length as the arm. Then one on the bottom is very short and small. Take your time with these as they are often stuck and may need penetrating oil and time to soak in order to come out. The plate may also need some gentle persuasion to come off.



Now, the large upper gear is free to be pulled forward and out so you can align it correctly. In the backside of the points should be a mark indicating A for anti-clockwise, or C for clockwise. Make sure you use the correct timing mark on the large gear that matches whatever the points are marked for.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Nevada Bob Middleton on Friday, April 21, 2017 - 10:51 pm:

Seth thanks SO MUCH
i known not turn the mag unless its grounded
In the armature theres a safety gap to help with it.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Seth in Alabama on Friday, April 21, 2017 - 11:22 pm:

No problem, happy to help. It's easier with pictures to see what's going on.


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