J4 magneto

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J4 magneto

Postby Scooter1 » Sun Mar 13, 2022 11:59 am

Went to replace the oil cup cap on the magneto and can’t get the remaining brass from the old cup out.
Was going to run a drill bit down through the oil cup access but want to make sure no shaving fall into magneto.
Any recommendations on how to proceed. I have removed the magneto fr9mmthe tractor so I can disassemble if needed?
Any manauls that show how to disassemble ?

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Don McCombs
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Re: J4 magneto

Postby Don McCombs » Sun Mar 13, 2022 12:18 pm

Is there any of the brass remaining above the casting?
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Re: J4 magneto

Postby Jim Becker » Sun Mar 13, 2022 12:41 pm

I'd probably try to collapse it and get it out in one piece. Since I don't have a small enough punch/chisel, I'd sharpen a small nail and try to drive it in along side the oil cup.

When that failed, I'd remove the flange before drilling it out. As I recall, removing the flange requires removing the impulse coupling (using a special tool to not break it). Then the flange is held by 4 screws. The screws are an odd length, so don't loose them.

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Re: J4 magneto

Postby john2189 » Sun Mar 13, 2022 2:48 pm

I think those are pressed in but You could try a small easy out to try to twist it out
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Re: J4 magneto

Postby Eugene » Sun Mar 13, 2022 4:03 pm

Black Snap-on Hole Plug Silicone Rubber Blanking End Caps Seal Stopper 2.5~30mm, Amazon
I have an excuse. CRS.

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Re: J4 magneto

Postby JimCub48 » Sun Mar 13, 2022 5:22 pm

I would take a little cotton swab and put in the brass whole to block any shavings from falling in . And then I would try a left hand drill bit and try to twist the brass insert out. If that is successful use a shop vac. And small tweezer to pull out the cotton swab. This should stop any shavings from falling in.

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Re: J4 magneto

Postby Rick Spivey » Mon Mar 14, 2022 6:17 am

In addition, see if you could set it up so that you are drilling in the "up" direction instead of "down"; should be quick since it is brass.
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