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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing ET92 Inner Roller Set on Mainshaft
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<blockquote data-quote="oexing" data-source="post: 148396" data-attributes="member: 1493"><p>There are some assembling aspects to see if you fit lipped roller bearings , depending on where the roller set is located, in inner or outer race. Anyway, I have not found this punch lock thing on any continental engine, just poor engineering escape for need of better idea. How often can you do this till the engine looks shameful ? </p><p> I would never do the screw fix for fear of starting cracks in this highly loaded place, definitely. The less offensive idea is just a very easy hammering the edge of the bore down a bit towards the radiused race, in a few places around. </p><p> For working out shims on all shafts, crank included, I made POM dummy bearings, easy fit but with same width. So you can test assemble all shafts , one at each time , to get sizes for shims. So after you won´t have surprises when assembling the completed engine. This no different for ball or roller bearings, lipped or not. </p><p> Bearing shrink fits in case , no need to be excessive, I´d like them to get free at 100-120 degrees C. For assembling the engine you will not want to have more than 80 degrees so not an excuse for punch locks just because the bearings might drop out ? It is a good idea to calculate shrink fits for each size of bearing in percentage of nominal diameter for secure fit up to min. 80 degrees C . The cam spindles will have been fitted at this stage a while ago at 200 degrees, so no , no punch job then. </p><p> Well, I´d be ashamed as a mechanic to design something around punch locking to save my ass. A matter of attitude to your profession ? </p><p></p><p> Vic</p></blockquote><p></p>
[QUOTE="oexing, post: 148396, member: 1493"] There are some assembling aspects to see if you fit lipped roller bearings , depending on where the roller set is located, in inner or outer race. Anyway, I have not found this punch lock thing on any continental engine, just poor engineering escape for need of better idea. How often can you do this till the engine looks shameful ? I would never do the screw fix for fear of starting cracks in this highly loaded place, definitely. The less offensive idea is just a very easy hammering the edge of the bore down a bit towards the radiused race, in a few places around. For working out shims on all shafts, crank included, I made POM dummy bearings, easy fit but with same width. So you can test assemble all shafts , one at each time , to get sizes for shims. So after you won´t have surprises when assembling the completed engine. This no different for ball or roller bearings, lipped or not. Bearing shrink fits in case , no need to be excessive, I´d like them to get free at 100-120 degrees C. For assembling the engine you will not want to have more than 80 degrees so not an excuse for punch locks just because the bearings might drop out ? It is a good idea to calculate shrink fits for each size of bearing in percentage of nominal diameter for secure fit up to min. 80 degrees C . The cam spindles will have been fitted at this stage a while ago at 200 degrees, so no , no punch job then. Well, I´d be ashamed as a mechanic to design something around punch locking to save my ass. A matter of attitude to your profession ? Vic [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Installing ET92 Inner Roller Set on Mainshaft
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