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Stubborn Generator Rotor
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3shedman
Ashford Kent
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May 20, 2019 - 12:02 pm
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Stripping down a D10 4 speed engine, I have reached the stage of removing the generator rotor. I have removed the main nut and cannot see the spring washer as shown in engine diagrams. The manual states that the rotor should slide off the main spline. No such luck ! It appears to be stuck solid. Should I try brute strength with pullers or is there a technical knack I am missing. Any advice welcome !

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cocorico
Central France
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May 20, 2019 - 12:14 pm
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Have a look ** Please log in to view **. I found it using the search function I suggest to people: stuck rotor site:bsabantamclub.com/forum typed into the browser. You may spot other helpful posts, too.

1956 D3 awaiting a new magneto. 7 other bikes in the Barn, 6 runners and a still in progress Morini 250

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3shedman
Ashford Kent
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May 20, 2019 - 5:29 pm
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Thanks for the information!

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noddy-hol
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May 20, 2019 - 6:34 pm
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Hi...I would try a 2/3 legged puller and when its under pressure a slight 'tap' on the end of the puller to shock its release..and a hot air gun to help..

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3shedman
Ashford Kent
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May 20, 2019 - 8:18 pm
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Thanks, I’ll try it tomorrow.

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AdrianS
Harlaston Staffs
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May 21, 2019 - 3:59 pm
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Mine was very stubborn.

Impact wrench to remove nut, 3 legged puller to remove rotor. The rotor was tight throughout the whole length of the shaft. It was also tight refitting it. I had to tap mine with a hide hammer carefully back on. It was still tight even after cleaning the inside of the rotor really well.

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chippy
medway
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May 21, 2019 - 7:52 pm
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Hi Shedman, I had one like that, I used a puller on mine and was dismayed to see the outer magnetic part pulling off the centre hexagon , so I kept going ,but before the two parts separate ,they need to be marked so as to go back in the same position, when that's off you can set about getting the hexagon off  ( I used the same puller ) depending how tight it is it may need a little heat. Before reassembly of the two parts it will probably need a slight lead on the hexagon to get it started, mine went back together in the vice with a good pressure, I then made sure the hole was clean and also removed the discoloration from the shaft with 1200 wet and dry. If you don't assemble as it came apart it will not be concentric and the spacing in the stator will not be even. it should slide on or off the shaft quite easy ,probably worth using a bit of grease or copper grease to re-assemble.

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nickjaxe
Runcorn Cheshire UK
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May 22, 2019 - 9:57 am
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Once I got mine off...I cleaned up the shaft with some wet/dry paper...went on with gentle hand pressure then.

My Bantam video              https://www.you.....jpOFmzRZRI

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AdrianS
Harlaston Staffs
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May 22, 2019 - 5:04 pm
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I would be cautious about heating it - I think this may affect the magnetism!

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chippy
medway
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May 22, 2019 - 10:32 pm
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It's not the hexagon that is magnetic.

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AdrianS
Harlaston Staffs
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May 23, 2019 - 5:53 pm
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I was just a bit concerned that someone may cook the whole rotor if it was stubborn!

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chippy
medway
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May 24, 2019 - 5:05 pm
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I get your point !

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