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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Big End
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<blockquote data-quote="powella" data-source="post: 176977" data-attributes="member: 1609"><p>Got a comet with a busted big end ? try this it ain`t rocket science !!!</p><p>Main tools you will need : A Lead Hammer</p><p> Hydraulic press</p><p> Truing Jig </p><p> Vice and various spacers.</p><p>Beg steal or borrow all of these ,if this is not possible hit the DELETE button now .</p><p>Pic 1 and 2 show the Dollies needed I used 3 but 2 will do . the long one is to hold the whole assembly in the vice to stop any turning while undoing the nuts.</p><p>Pic 3 and 4 show the spacers needed to push the Small end and the outer race into the Rod.</p><p>Pic 5 and 6 show the whole assembly in the vice.</p><p>Pic 7 " jacking screws " to open up the wheels while still in the vice. 3 off and open up the wheels very slowly. </p><p>Pic 8 shows the wheels apart.</p><p>Pic 9 shows a shaft being checked for true BUT leave well alone since this will mean a extensive machining operation and to coin a phrase "if it ain`t broke etc " The truing jig will only use the bearing surfaces close to the Fly Wheel .</p><p>Pic 10 shows the Pin and Thrust washers - if these are blue or scored turn them round and use again.</p><p>A point to make here is that when pushing in he new pin is that the oil delivery hole is at a 11 -o-clock position relative to the Con Rod ( at Top Dead Center ) .This is so that the rollers get a dose of cold ,thick oil before the big push. there is some debate as to this , some say it is not important .</p><p>Pic 11 shows the truing jig -your Fly wheels when together will sit in the four rollers and be close up to the Flywheel edge The rollers will simulate the Main Bearings .</p><p>Finally , and this is the best bit ,mark the max run out and then bash that spot with your Lead Hammer - it will take several goes but when all is correct the Max run out will be 0.0000 at best and 0.002 at worst. </p><p>Pic 12 shows 4 sets with a best run out reading of 0.0005 and 0.0015 worst.</p><p>Torque the nuts down to the specified value as per the instruction sheets ( 150 Ft Lbs ? )</p></blockquote><p></p>
[QUOTE="powella, post: 176977, member: 1609"] Got a comet with a busted big end ? try this it ain`t rocket science !!! Main tools you will need : A Lead Hammer Hydraulic press Truing Jig Vice and various spacers. Beg steal or borrow all of these ,if this is not possible hit the DELETE button now . Pic 1 and 2 show the Dollies needed I used 3 but 2 will do . the long one is to hold the whole assembly in the vice to stop any turning while undoing the nuts. Pic 3 and 4 show the spacers needed to push the Small end and the outer race into the Rod. Pic 5 and 6 show the whole assembly in the vice. Pic 7 " jacking screws " to open up the wheels while still in the vice. 3 off and open up the wheels very slowly. Pic 8 shows the wheels apart. Pic 9 shows a shaft being checked for true BUT leave well alone since this will mean a extensive machining operation and to coin a phrase "if it ain`t broke etc " The truing jig will only use the bearing surfaces close to the Fly Wheel . Pic 10 shows the Pin and Thrust washers - if these are blue or scored turn them round and use again. A point to make here is that when pushing in he new pin is that the oil delivery hole is at a 11 -o-clock position relative to the Con Rod ( at Top Dead Center ) .This is so that the rollers get a dose of cold ,thick oil before the big push. there is some debate as to this , some say it is not important . Pic 11 shows the truing jig -your Fly wheels when together will sit in the four rollers and be close up to the Flywheel edge The rollers will simulate the Main Bearings . Finally , and this is the best bit ,mark the max run out and then bash that spot with your Lead Hammer - it will take several goes but when all is correct the Max run out will be 0.0000 at best and 0.002 at worst. Pic 12 shows 4 sets with a best run out reading of 0.0005 and 0.0015 worst. Torque the nuts down to the specified value as per the instruction sheets ( 150 Ft Lbs ? ) [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Comet Big End
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