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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: 87477" data-attributes="member: 3426"><p>I checked and with new thrust washers and new big end, side clearance looks like it will be fine. Being a Comet crank it's easier to deal with. Pressed the pin into the drive side flywheel, which showed slightly less interference fit than the timing side. Quite happy with the amount of force it took to press it home. </p><p></p><p>Here I am thinking out loud again.... not having any sort of jig for aligning the flywheels, I'm thinking of putting the drive side into a chuck mounted to the bed of the mill, centring it with the quill, (using the centre in the inboard side of the mainshaft and confirming with running a dial gauge around the circumference of the flywheel) , mounting the timing side flywheel mainshaft in the quill with a collet, make sure it is running true, zero the DRO. Then lower the timing side down (going to try and set the quill up so it is totally neutral) and using a slightly modified puller, get the pin into the timing side flywheel as far as possible, then finish in the press. Feel free to rain on my parade or make suggestions. I think I can get as close this way as using some of the frightening alignment tools I have seen on the inter webs.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 87477, member: 3426"] I checked and with new thrust washers and new big end, side clearance looks like it will be fine. Being a Comet crank it's easier to deal with. Pressed the pin into the drive side flywheel, which showed slightly less interference fit than the timing side. Quite happy with the amount of force it took to press it home. Here I am thinking out loud again.... not having any sort of jig for aligning the flywheels, I'm thinking of putting the drive side into a chuck mounted to the bed of the mill, centring it with the quill, (using the centre in the inboard side of the mainshaft and confirming with running a dial gauge around the circumference of the flywheel) , mounting the timing side flywheel mainshaft in the quill with a collet, make sure it is running true, zero the DRO. Then lower the timing side down (going to try and set the quill up so it is totally neutral) and using a slightly modified puller, get the pin into the timing side flywheel as far as possible, then finish in the press. Feel free to rain on my parade or make suggestions. I think I can get as close this way as using some of the frightening alignment tools I have seen on the inter webs. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Big End Replacement
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