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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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<blockquote data-quote="Cyborg" data-source="post: 87611" data-attributes="member: 3426"><p>So yesterday, I installed the thrust washers and rod. Lowered the quill to start the T/S flywheel onto the pin. Used a rather crude method (modified puller) to encourage the two parts together (without transferring any forces to the mill) far enough that it would be safe to move the assembly to the press (about 1/3 the way home). Moved it to the hydraulic press and once on all the way, I put the crank assemble between two centres on the lathe. That is all I have at the moment. As mentioned previously I verified that the centres in the crank were true. Now I have a bit of a quandary. I don't know if it was my brilliant use of the mill as an alignment tool or just dumb ass luck, but the rod side clearance is .013" runout on the timing side is .002" and the drive side is somewhere between .0025" and .003" The high points are 180 degrees opposite. Given that Terry Prince does his twin cranks to be within.002 and states that with the usual imperfect case alignment and C3 bearings, it's fine.... along with the fact that I have never beaten a crankshaft in anger (plus this crank has suffered enough) , so the quandary is.... do I just let sleeping dogs lie. I suppose it could still go to hell in a handbag once I torque the timing side crank pin nut.</p><p></p><p>[ATTACH=full]17700[/ATTACH]</p></blockquote><p></p>
[QUOTE="Cyborg, post: 87611, member: 3426"] So yesterday, I installed the thrust washers and rod. Lowered the quill to start the T/S flywheel onto the pin. Used a rather crude method (modified puller) to encourage the two parts together (without transferring any forces to the mill) far enough that it would be safe to move the assembly to the press (about 1/3 the way home). Moved it to the hydraulic press and once on all the way, I put the crank assemble between two centres on the lathe. That is all I have at the moment. As mentioned previously I verified that the centres in the crank were true. Now I have a bit of a quandary. I don't know if it was my brilliant use of the mill as an alignment tool or just dumb ass luck, but the rod side clearance is .013" runout on the timing side is .002" and the drive side is somewhere between .0025" and .003" The high points are 180 degrees opposite. Given that Terry Prince does his twin cranks to be within.002 and states that with the usual imperfect case alignment and C3 bearings, it's fine.... along with the fact that I have never beaten a crankshaft in anger (plus this crank has suffered enough) , so the quandary is.... do I just let sleeping dogs lie. I suppose it could still go to hell in a handbag once I torque the timing side crank pin nut. [ATTACH=full]17700[/ATTACH] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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