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Antique Gas Engine Discussion

Webster dissassembly?


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  #1  
Old 05-27-2005, 12:52:49 PM
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Jebaroni Jebaroni is offline
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Question Webster dissassembly?

Hey guys. I'm going to go pick up my second engine this weekend and it's got a webster mag on it. Depending on how the mag looks, I may want to take it apart to polish and clean it up some. Now, I don't have a magnet charger and was wondering if anyone could give me some hints and suggestions as to how to properly use a magnet keeper and things like that.

I've heard that i could use just a plain old piece of flat bar (lots of it laying around here) and slide the magnets off the mag and onto the keeper bar. Does this sound right? It kinda baffles me how a magnet would keep or lose it's magnetism based on whether it was in contact with another metal object. I know that impacts tend to lower magnetism but the whole keeper/recharging magnets thing still kinda eludes me.

Next, if i get the magnets off, i've also heard that i should leave the coil and windings inside alone as well? I guess what i'm wanting to know is how can I disassemble a webster for cleanup without having to use a magnet charger. Thanks guys!

Jeb
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Old 05-27-2005, 02:15:47 PM
Rudy Rudy is offline
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Default Re: Webster dissassembly?

Hi. If you take the magnets or magnet off of the mag you will have to recharge them. The mag is low tension and strong magnets are a must. This should be done anytime the inductor is removed or the magnets are removed. if you want a mag that really works good the mag should be charged as an assembly to get total saturation. this means that when the springs are off the mag after it is charged, the inductor should have quit a bit of resistance. If you remove the coils for any reason, replace them as the varnish insulation is very brittle and will crack and then you will have an internally shorted coil. I would personally replace the coils anyway, esp. on the Webster M models...also make sure that the side plate bushings are tight. as play here will cause the inductor to hit the poles and the result is no voltage. if the mag is repaired RIGHT you can start the engine with very little effort.
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Old 05-27-2005, 03:09:53 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Webster dissassembly?

Remove a magnet with no keeper, and it will lose up to 80% of its magnetism within seconds! Webters are sensitive to magnet removal at any length. Just wipe it down lightly with kerosene and you shpuld be good to go.
Andrew
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Old 05-27-2005, 03:15:44 PM
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Default Re: Webster dissassembly?

I suppose that if it has a pot metal body, i'll just try some Mothers Al. polish on the exterior with the buffing wheel on my dremel tool while it's still assembled. If it is the brass body (I hope!), and has any signs of weakness to the spark, i'll go ahead and rebuild it. Can i send the magents off to be recharged and have the mailed back to me? I can't justify spending $80 too build a tool i'll only use once and probably never again. Anybody know if Larry Trammel in Chapel Hill has a magnet charger? I'm just trying to think ahead and get all my ducks in a row before i do anything. Thanks guys!

Jeb
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Old 05-27-2005, 09:10:12 PM
Al Wait Al Wait is offline
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Default Re: Webster dissassembly?

I would suggest that you do NOT try to take it apart yourself; you will only destroy it. If it works, leave it alone. If you must have it pretty, send it to a professional rebuilder. The push finger and spring arm are keyed on tapered shafts, and are generally extremely tight. It takes a special puller to remove them. If it is a pot-metal magneto, as most of them are, the armature shaft bushings are cast into the side plates and are not removable. The side plates must be replaced. The armature end-play is also important. It will also have to be re-magnetized AFTER final assembly. Al Wait
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Old 05-27-2005, 10:55:00 PM
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Gary Pflum Gary Pflum is offline
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Default Re: Webster dissassembly?

If you do take the mag apart, look at the ends of the armature. On one end and one end only there will be a chisel mark where the nut threads on it. The mark is useally towards the ignitor. Make sure you reassemble it the way it was taken apart. If it is assembled backwards it will produce a weak spark or no spark at all.
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Old 05-27-2005, 11:46:01 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: Webster dissassembly?

Also, if you reverse the magnets, you will lose spark as well. Shipping magnets in the mails is a nono! They are fragile! If the box is dropped, they are history. Also, some of the equipment used to view mailed items (post 911) may demagnetise them inside the box!
Andrew
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