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#650538 - 04/28/16 2:04 pm Magneto bearing removal  
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limeyrider Offline
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limeyrider  Offline
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gastonia .. NC
Having fabricated a puller to remove the bearing inner race from the slip ring end, and finding it VERY tight ....is it permissible to apply moderate heat to the inner race .... given it's proximity to the slip ring,and coils? .... don't want to cook anything !.

Thank you for any and all advice.

James.

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#650539 - 04/28/16 2:18 pm Re: Magneto bearing removal [Re: limeyrider]  
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Magnetoman Online content
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Originally Posted By limeyrider
is it permissible to apply moderate heat to the inner race
The shaft and the race are both made of steel so, unlike a bearing in an Al case, there would be no differential thermal expansion, i.e. heat won't help. Personally, I would be very reluctant to apply heat anyway because of both the coil and the slipring.

Have you removed races from other magnetos before? The reason I ask is what you think is "VERY tight" may be "normal." Races require significant persuasion to get them to move.

#650547 - 04/28/16 3:16 pm Re: Magneto bearing removal [Re: Magnetoman]  
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gREgg-K Online content
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Originally Posted By Magnetoman
Originally Posted By limeyrider
is it permissible to apply moderate heat to the inner race
The shaft and the race are both made of steel so, unlike a bearing in an Al case, there would be no differential thermal expansion, i.e. heat won't help. Personally, I would be very reluctant to apply heat anyway because of both the coil and the slipring.

Have you removed races from other magnetos before? The reason I ask is what you think is "VERY tight" may be "normal." Races require significant persuasion to get them to move.

Agreed. Do not heat the race, because not only will that not do any good, but it may in fact damage something.

Perhaps you could post a pic of your puller. Could be something in its construction that is causing the reluctance you observe.

The bearing races can be difficult enough to remove, but unless the pulling force is perfectly axial with the shaft, the inner race will bind on the shaft, rather than slide.

.. Gregg


Spyder Integrated Technologies
Lucas, BTH, & Miller Magneto & Dynamo Restoration
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magneto@spyder-it.com
#650552 - 04/28/16 3:36 pm Re: Magneto bearing removal [Re: limeyrider]  
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DBDBrian Online content
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Hi James, as MM and Gregg comment, they can be VERY tight. I have an original factory claw type puller, but at times have backed off, for fear of damaging the armature or the puller.
I have removed stubborn inner race's by grinding a flat across the race to within a few thou of the shaft, to release the tension. This needs to be done carefully, and slowly, so as not to generate to much heat. Obviously it's goodbye bearing.


Brian

Made In England
#650554 - 04/28/16 4:26 pm Re: Magneto bearing removal [Re: DBDBrian]  
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limeyrider Offline
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gastonia .. NC
Thanks to MM,Gregg and Brian ....in the interest of " do it right", I am setting aside the home fabricated puller and will ask my local small electric motor repair shop to kindly remove the bearing race for me.

Thank you for your wisdom and guidance.

James.

#650558 - 04/28/16 5:25 pm Re: Magneto bearing removal [Re: limeyrider]  
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trevinoz Online content
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You will have to master the removal process because you may have to take the race off a few time when you are shimming to set the end float.

#650563 - 04/28/16 6:46 pm Re: Magneto bearing removal [Re: trevinoz]  
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Magnetoman Online content
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Originally Posted By trevinoz
you may have to take the race off a few time when you are shimming to set the end float.
To add a bit to that, the race-to-race spacing needs to be 4.000". This is adjusted by the shim(s) behind the race. A 0.000" end float is ideal, especially for a face cam, but it can be 0.001-0.005" (max.) for a ring cam, and 0.001"-0.003" (max.) for a face cam. This is set by different shims that are placed between the main body and the outer piece that holds the cam.

I suppose it's fortunate that magnetos still work with incorrect or missing shims, but properly dealing with machining tolerances by correctly shimming them is one of the keys to having a magneto live a long and happy life.

#650576 - 04/28/16 8:53 pm Re: Magneto bearing removal [Re: Magnetoman]  
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limeyrider Offline
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gastonia .. NC
Thanks to all who have offered help and advice, my " Heath Robinson" efforts at fabricating a puller without benefit of machine tools are suspect.
Having to remove, and replace the bearing perhaps several times to get the shimming correct tells me that the services of a machine shop are need to properly make an accurate puller. I don't want to give up on trying to repair my mag., nor do I want to "bodge" it .... the next owner will not thank me.
There is a small voice that is saying " leave it to a pro."

Thanks again.

James.

#650594 - 04/29/16 12:44 am Re: Magneto bearing removal [Re: limeyrider]  
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Boomer Online content
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Orygone
And I recommend that pro to be Doug Wood. It will cost you around $500, plus or minus, but it will be a bolt on ready new magneto.


Bill B...

Last edited by Boomer; 04/29/16 12:46 am.

Boomer
#650638 - 04/29/16 9:26 am Re: Magneto bearing removal [Re: Boomer]  
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limeyrider Offline
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limeyrider  Offline
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gastonia .. NC
For the time being the magneto will have to take a back seat, the small voice is getting louder.

Thanks.

James.


Moderated by  Rich B 


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