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MO1L magneto bearing removal

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MO1L magneto bearing removal

Posted by George Phillips at February 20. 2017
Hi Guys How do I remove the inner race on the armature shaft of the drive side mag bearing? Will a hot air gun destroy the armature? Any help appreciated. George

Re: MO1L magneto bearing removal

Posted by jim_hill at February 20. 2017

George, I made up an extractor using the slide hammer principle, are you familiar with that? If so ,the business end comprised a thick walled tube that fitted over the inner race with 4 radially drilled holes , tapped probably 5mm into which I used 5 mm cap screws with the ends filed to a profile to fit into the bearing track, divise a method ofixing a piece of all thread probably 8 mm to the other end of the tube using the slide hammer method ( piece of solid steel with a 8 mm clearance hole ) gently urge the inner race up the mag shaft and " bingo" job done, you will need access to a lathe to make the device,  where in UK are you ? Regards. Jim hill.

Re: MO1L magneto bearing removal

Posted by George Phillips at February 20. 2017
That's well explained, Jim, but I don't have a lathe. It would also require a set of taps. Do you have a view on heating the bearing and the possible problem of heat transfer to the armature? George

Re: MO1L magneto bearing removal

Posted by jim_hill at February 21. 2017
Previously George Phillips wrote:
That's well explained, Jim, but I don't have a lathe. It would also require a set of taps. Do you have a view on heating the bearing and the possible problem of heat transfer to the armature? George
George I wouldn't go down the warming up route if I were you, I did see an alternative option somwhere that involves a vice and some copper rod about .125 diameter. Make a U shape with the copper rod ,it should be sized ti fit in the bearing track, then grip it quite tightly in a vice with reasonable grip on the inside of the jaws,gently tap the drive end shaft with a soft drift between shaft end and hammer, you see where I'm going with this. You will need a third hand ( assistant) to hold onto the armature as if it suddenly gives the chances are it fall on the floor "butter side down" speaking in metaphors.good luck, Jim.

Re: MO1L magneto bearing removal

Posted by George Phillips at February 21. 2017
Thanks Jim. That's a cunning solution! I'll keep an eye out for copper rod. George

Re: MO1L magneto bearing removal

Posted by nicholas_clark at February 21. 2017
Hi George. If you don't have the facilities to make a bearing puller you can buy one on ebay here: http://www.ebay.co.uk/itm/lucas-magneto-bearing-puller-/332123506725?hash=item4d541a8825:m:mpcYLF29bbZWCzc5EyLzbzA Very easy to use. Hope this helps. Regards Nick

Re: MO1L magneto bearing removal

Posted by George Phillips at February 21. 2017
Thanks Nick. I'll follow that up. George

Re: MO1L magneto bearing removal

Posted by anna jeannette Dixon at February 22. 2017

Hello George  I always say  where there is a will there is away  by using your brains   just stop have a cuppa tea  and  contemplate  look that the problem and think about ways around it  or the alternatives  has the case maybe   good luck  your doing great     yours   anna j      

Re: MO1L magneto bearing removal

Posted by George Phillips at February 22. 2017
Ebay puller ordered. Watch this space! George

Re: MO1L magneto bearing removal

Posted by Skip Brolund at February 22. 2017

Hi George,

I do several hundred mags a year & of course have special pullers bade to remove the inner & outer races.

Jims method can also work well if the race isnt too tight.

The tool you are getting from ebay also works well, but the three perimeter screws can marr the bearing surface, so as long as your replacing the race no worries.

Here are the tools I use:

http://www.brightsparkmagnetos.com/condensectomy/splitting_armature.htm

feel free to contact me directly if you need any further assistance :)

Re: MO1L magneto bearing removal

Posted by George Phillips at February 23. 2017
Thank you Skip. Interesting site. I'll have a good read of that. I'll see how I get on when the puller arrives. Thanks for your kind offer of help. George
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