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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="greg brillus" data-source="post: 133760" data-attributes="member: 597"><p>Ideally it should be a hard shim washer........You can do the whole job just on the drive side case half only, with the primary side of the case sat on some blocks of wood, lower the crank with scroll ET 77 and your modified "Test piece bearing" in place.........If your unsure you can lower the timing side case on without bearings in place to check the rods are central, perhaps slip the small outer race on the mainshaft to hold the crank.......... i just do it with the drive side case only, saves a lot of time. Move the rods to their left/right when checking how central they are........The crank often needs a shim.......Make sure it is sitting dead flat against the boss on the flywheel.......often the inner edge of the shim hangs up if there is a slight radius on the shaft for whatever reason.........Just add a small bevel to the shim with a dremel if needed to get the shim nice and flat against the flywheel boss. The weight of the crank assembly should be enough to check this, unless the shaft is a tight fit in the E91 bearing........This can happen, and it is a bugger...... Just see how you go with that first.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 133760, member: 597"] Ideally it should be a hard shim washer........You can do the whole job just on the drive side case half only, with the primary side of the case sat on some blocks of wood, lower the crank with scroll ET 77 and your modified "Test piece bearing" in place.........If your unsure you can lower the timing side case on without bearings in place to check the rods are central, perhaps slip the small outer race on the mainshaft to hold the crank.......... i just do it with the drive side case only, saves a lot of time. Move the rods to their left/right when checking how central they are........The crank often needs a shim.......Make sure it is sitting dead flat against the boss on the flywheel.......often the inner edge of the shim hangs up if there is a slight radius on the shaft for whatever reason.........Just add a small bevel to the shim with a dremel if needed to get the shim nice and flat against the flywheel boss. The weight of the crank assembly should be enough to check this, unless the shaft is a tight fit in the E91 bearing........This can happen, and it is a bugger...... Just see how you go with that first. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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