The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => A7 & A10 Engine => Topic started by: Tone on 18.08. 2009 18:28
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Guys, I've just ordered an idler pinion spindle as the one on the A10 has got mashed threads, before I get the lump hammer out does the spindle come off the pinion either way? and is it a mater of supporting it and giving it a clout?
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Hi Tone, The idler pinion spindle will come out either way but I would suggest that you put a bit of heat on the pinion centre but not too close to the spindle before you try to remove it. Support it in a vice and a fine solid hit should break the seal.
Beezageezauk.
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It makes me wonder how bad threads must get before they should no longer be repaired. On my bike, all of the fine threads on shaft ends needed repair or dressing up to varying
degrees extents before nuts would fit. I found that the half-round needle file that comes in the common sets has a nice shape to approximate fine threads.
Richard L.
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To repair damaged threads on big things line the crank end.
Buy a new nut and cut it in 1/2, point to point.
Dress the cut faces on a good stone to make them right angles
put the 2 halves back on the damaged thread and hold them together with a set of lock jaws or better still a tool makers clamp and run it up and down the thread thightening the clamp a little more each time till the threads are restored.
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Speaking to myself, "Duh!"
Thank you. I suppose I am the last would-be mechanic on the planet who didn't think of this.
Richard L.
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BTW, a metric thread file comes in real handy here, too since the pitch (26 tpi ~ 1mm, I believe) and thread form are really close.