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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearings
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<blockquote data-quote="SteveO" data-source="post: 113373" data-attributes="member: 3636"><p>Yes Bill, new mainshafts. I've now driven the bearings on (not brutally!), I used an old Moto Guzzi fork leg that is a good fit on the bearing inner and over the shafts. Now for the next problem. In the photo attached, you can see a bright spot on the housing (where a liner has been fitted because the housing was damaged) and on the retaining screws for the bearing plates. This is where the big end pin itself, not the nut, is making contact. So what is the solution? A shim on the mainshaft behind the bearing seems most logical, however this may put the crank too far over (as Stu suggested, the oil pump worm is already up against the bearing, not the step in the shaft and this is without the timing side being shimmed). Haven't got as far as putting the cases together yet to check centrality (!) of the rods. Did have to source an oil scroll for the alloy spacer as my engine didn't have one!</p></blockquote><p></p>
[QUOTE="SteveO, post: 113373, member: 3636"] Yes Bill, new mainshafts. I've now driven the bearings on (not brutally!), I used an old Moto Guzzi fork leg that is a good fit on the bearing inner and over the shafts. Now for the next problem. In the photo attached, you can see a bright spot on the housing (where a liner has been fitted because the housing was damaged) and on the retaining screws for the bearing plates. This is where the big end pin itself, not the nut, is making contact. So what is the solution? A shim on the mainshaft behind the bearing seems most logical, however this may put the crank too far over (as Stu suggested, the oil pump worm is already up against the bearing, not the step in the shaft and this is without the timing side being shimmed). Haven't got as far as putting the cases together yet to check centrality (!) of the rods. Did have to source an oil scroll for the alloy spacer as my engine didn't have one! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Main bearings
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