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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing Side Alignment
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<blockquote data-quote="chark_mandler" data-source="post: 137524" data-attributes="member: 2963"><p>I'm currently rebuilding my Dad's Comet. Plenty of experience building road and race engines but not Vin engines. Crankcases have new rollers and ball bearings fitted and flywheels are shimmed to be central pulling up against the ball bearing etc. Putting case halves together with the flywheels there is space between the shoulder that the oil pump worm (OP31) butts up to and the large bearing when sitting against the flywheel about .045" (timing side) . Also the half time pinion hits the outer race (outer ET94) before butting up to the outer bearing.</p><p>The obvious solution is to shim the inner bearing out from the flywheel to take up the space and push the oil worm and half time pinion out - This will be in the region of .050" . This will also mean that the pinion, worm, bearing inner are butted up to each other and the timing side flywheel when the outer bolt is done up (I realise this has nothing to do with the position of the flywheel in the case and that is taken care of by the drive side). There is nothing about this in KTB or Paul Richardsons book, am I going about this the right way?</p><p></p><p>I will be fitting a primary side seal. The gap between the oil scroll and the main bearing spacer (ET19) is very small and I doubt that much oil will get past it and the scroll (ET77) if working will extract oil. Seeing as in std form the bearing was open to the primary side and probably had some positive air pressure pushing some oil through this will now not be the case especially as I will be running a PCV valve. Ball bearing is now in so there is not the option of getting one with shields running in its own oil.Is there a way to push some oil in this direction? - Perhaps turn the scroll ET77 and put some holes in the spacer ET19? Or even mill away the inner portion of the spacer ET19 (I can cover the bearing from swarf).</p><p>There are several posts about this but nothing definitive.</p></blockquote><p></p>
[QUOTE="chark_mandler, post: 137524, member: 2963"] I'm currently rebuilding my Dad's Comet. Plenty of experience building road and race engines but not Vin engines. Crankcases have new rollers and ball bearings fitted and flywheels are shimmed to be central pulling up against the ball bearing etc. Putting case halves together with the flywheels there is space between the shoulder that the oil pump worm (OP31) butts up to and the large bearing when sitting against the flywheel about .045" (timing side) . Also the half time pinion hits the outer race (outer ET94) before butting up to the outer bearing. The obvious solution is to shim the inner bearing out from the flywheel to take up the space and push the oil worm and half time pinion out - This will be in the region of .050" . This will also mean that the pinion, worm, bearing inner are butted up to each other and the timing side flywheel when the outer bolt is done up (I realise this has nothing to do with the position of the flywheel in the case and that is taken care of by the drive side). There is nothing about this in KTB or Paul Richardsons book, am I going about this the right way? I will be fitting a primary side seal. The gap between the oil scroll and the main bearing spacer (ET19) is very small and I doubt that much oil will get past it and the scroll (ET77) if working will extract oil. Seeing as in std form the bearing was open to the primary side and probably had some positive air pressure pushing some oil through this will now not be the case especially as I will be running a PCV valve. Ball bearing is now in so there is not the option of getting one with shields running in its own oil.Is there a way to push some oil in this direction? - Perhaps turn the scroll ET77 and put some holes in the spacer ET19? Or even mill away the inner portion of the spacer ET19 (I can cover the bearing from swarf). There are several posts about this but nothing definitive. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Timing Side Alignment
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