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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="Cyborg" data-source="post: 133479" data-attributes="member: 3426"><p>Buying bushings off the shelf can be a bit of a crap shoot.... too many variables. Faced with the same task of installing new bushings and a seal, this one will be of interest to me. The fact that there is a seal in between the bushings adds to the aggravation. Time saver lapping compound would be fine... except for the fact that the seal is there. Same goes for taking to to the guy with a Sunnen hone. If the bushings are oilite, which they should be, then skimming them on a lathe is an option, but an extremely sharp (appropriate) cutting tool must be used so the pores in the oilite aren’t smushed closed... and then there is the seal in there.</p><p>All the more fun because if the chain wheel drags, it’ll haunt you.</p><p>I suppose if one had lots of experience, all of the bits could be measured... calculate how much the bushings will shrink when installed and machine the bushings before installing them.</p><p></p><p>Edit... when installing bushings like the PD22 and C17 it is probably better to use a driver machined to fit into the bushing and then use an arbor press or hydraulic press just so it is easier to get the bushing started straight.... and continue straight. If it gets cocked at all, then the thin wall of the bushing will distort and cause a tight fit or drag on the shaft.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 133479, member: 3426"] Buying bushings off the shelf can be a bit of a crap shoot.... too many variables. Faced with the same task of installing new bushings and a seal, this one will be of interest to me. The fact that there is a seal in between the bushings adds to the aggravation. Time saver lapping compound would be fine... except for the fact that the seal is there. Same goes for taking to to the guy with a Sunnen hone. If the bushings are oilite, which they should be, then skimming them on a lathe is an option, but an extremely sharp (appropriate) cutting tool must be used so the pores in the oilite aren’t smushed closed... and then there is the seal in there. All the more fun because if the chain wheel drags, it’ll haunt you. I suppose if one had lots of experience, all of the bits could be measured... calculate how much the bushings will shrink when installed and machine the bushings before installing them. Edit... when installing bushings like the PD22 and C17 it is probably better to use a driver machined to fit into the bushing and then use an arbor press or hydraulic press just so it is easier to get the bushing started straight.... and continue straight. If it gets cocked at all, then the thin wall of the bushing will distort and cause a tight fit or drag on the shaft. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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