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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet timing chest
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<blockquote data-quote="vince998" data-source="post: 35340" data-attributes="member: 261"><p>Hi Grash,</p><p>As long as the timing plate holes are not countersunk, the tapers on the spindles won´t cause the shims (ET98/1) to dish.</p><p>To aid fitting spindles, assemble the spindle together with cam or follower and 1 extra shim (E95(cam) or ET98(follower) + nuts and put in the freezer overnight.</p><p>Heat cases to 200°c for a good couple of hours, carry out to garage or down to cellar where your spindle assys are waiting in a coolbox. Tap each spindle assy into place (it really should only need a tap).</p><p>After the last spindle is in place, remove the nuts (starting with the first spindle, it should have heated up enough to be gripped by the crankcase), and leave to cool.</p><p>As the cases cool, they retract the spindles in a little, but you´ve calculated for this by using an extra shim.</p><p>If everything is as it should be (all assembly are exactly the same width on the spindles, you´ve cracked it. If not, now comes the task of lining up the spindle ends so that the steady plate pulls down flush and at the same time enough clearance for the various components is present. (Your´re lucky, you only have 3 spindles to match up ;-)</p><p>Leave this until the crankcase halves are back together and done up tight!!!</p><p>Don´t worry if you have to pull out spindles a little to line up the ends (ends of the spindle shafts and not the threads) using a slide hammer, you can compensate with shims to attain correct clearance (thats why shims are there so use them!!). I´ve even put extra shims behind the followers to get them full contact with the cam before.</p><p>If done properly, you shouldn´t have to touch the timing side again for a long time.</p><p>On assembling, it is very easy to pinch the E95 shim/s between the spindle end and the steady plate (falls off the spindle and onto the threaded portion). Use clean oil for assembly and look before nipping everything up.</p></blockquote><p></p>
[QUOTE="vince998, post: 35340, member: 261"] Hi Grash, As long as the timing plate holes are not countersunk, the tapers on the spindles won´t cause the shims (ET98/1) to dish. To aid fitting spindles, assemble the spindle together with cam or follower and 1 extra shim (E95(cam) or ET98(follower) + nuts and put in the freezer overnight. Heat cases to 200°c for a good couple of hours, carry out to garage or down to cellar where your spindle assys are waiting in a coolbox. Tap each spindle assy into place (it really should only need a tap). After the last spindle is in place, remove the nuts (starting with the first spindle, it should have heated up enough to be gripped by the crankcase), and leave to cool. As the cases cool, they retract the spindles in a little, but you´ve calculated for this by using an extra shim. If everything is as it should be (all assembly are exactly the same width on the spindles, you´ve cracked it. If not, now comes the task of lining up the spindle ends so that the steady plate pulls down flush and at the same time enough clearance for the various components is present. (Your´re lucky, you only have 3 spindles to match up ;-) Leave this until the crankcase halves are back together and done up tight!!! Don´t worry if you have to pull out spindles a little to line up the ends (ends of the spindle shafts and not the threads) using a slide hammer, you can compensate with shims to attain correct clearance (thats why shims are there so use them!!). I´ve even put extra shims behind the followers to get them full contact with the cam before. If done properly, you shouldn´t have to touch the timing side again for a long time. On assembling, it is very easy to pinch the E95 shim/s between the spindle end and the steady plate (falls off the spindle and onto the threaded portion). Use clean oil for assembly and look before nipping everything up. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet timing chest
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