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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Multi-Plate Clutches
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<blockquote data-quote="BigEd" data-source="post: 153337" data-attributes="member: 161"><p>Small steps, minimum dismantling:-</p><p>The primary clutch will transmit enough power to get you up into the fifties just as you have found. It will get you home if you have a problem with the main clutch. (When an oil seal failed I rode from Wales to my home in the Midlands on the primary clutch.) If you can get into the fifties then your primary is driving as it should. If it is dragging check the adjustment:</p><ol> <li data-xf-list-type="ol">Adjust the clutch cable. You will find some help at this link: <a href="https://www.vincentownersclub.co.uk/threads/wont-shift.14431/#post-130962" target="_blank"><u><span style="color: rgb(44, 130, 201)">Clutch cable adjustment</span></u></a> See post #3.</li> <li data-xf-list-type="ol">Remove the clutch cover. You have some pushrod clearance adjustment at this end should you need it. If your primary is driving OK your clearance is probably OK. Pull in the clutch lever and see how much lift you have. You don't need much but the plate should lift square to the friction plate. If it lifts OK then it may not be lifting evenly. Engage a gear and rotate the rear wheel. (This is easier if you have the spark plugs removed or the valve lifter lever engaged. I pull the handlebar lever back and hold it back with a re-usable tie-wrap.) Check to see if the plate wobbles as it turns. If it does then the spring spacers may not be all the same lengths or the springs may be of different lengths. Remove the springs and check spring and spacer lengths. There are ways to help the plate lift square. Timetraveller produced a needle roller bearing that helps. I shortened the clutch pushrod and used an old valve (from an Austin mini?) to help keep things square.</li> </ol><p>At this stage you are looking at more dismantling:-</p><ol> <li data-xf-list-type="ol">Have look and see if there is oil in the clutch drum or on the clutch shoes. If you have oil here then it may be that oil is finding its way along the mainshaft. There should be a seal C18 fitted to the C3 shoe carrier. Some sealant applied to the splines when assembling can sometimes help here.</li> </ol><p>If you have already fitted a 'D' shock absorber you know that to check the next two seals requires the removal of the clutch drum:-</p><ol> <li data-xf-list-type="ol"> There is also a seal PD25 between the two bushes in the chain wheel.</li> <li data-xf-list-type="ol"> There is a large diameter seal PD26/1 fitted in the outer case.</li> </ol><p>On the brighter side, If there is no oil contamination you can remove the clutch shoes without much dismantling. If the linings look oil-free and in good condition then adjustment of the clutch plungers may be needed.</p><p></p><p>Maybe that is enough to be thinking about for now. There are lots of posts on clutch problems. Sorting the 'wheat from the chaff' is tedious. </p><p>Maybe a good starting point is here:- <a href="https://www.vincentownersclub.co.uk/threads/jig-to-hold-head-in-lathe.16283/page-4#post-148672" target="_blank"><u><span style="color: rgb(44, 130, 201)">https://www.vincentownersclub.co.uk/threads/jig-to-hold-head-in-lathe.16283/page-4#post-148672</span></u></a></p></blockquote><p></p>
[QUOTE="BigEd, post: 153337, member: 161"] Small steps, minimum dismantling:- The primary clutch will transmit enough power to get you up into the fifties just as you have found. It will get you home if you have a problem with the main clutch. (When an oil seal failed I rode from Wales to my home in the Midlands on the primary clutch.) If you can get into the fifties then your primary is driving as it should. If it is dragging check the adjustment: [LIST=1] [*]Adjust the clutch cable. You will find some help at this link: [URL='https://www.vincentownersclub.co.uk/threads/wont-shift.14431/#post-130962'][U][COLOR=rgb(44, 130, 201)]Clutch cable adjustment[/COLOR][/U][/URL] See post #3. [*]Remove the clutch cover. You have some pushrod clearance adjustment at this end should you need it. If your primary is driving OK your clearance is probably OK. Pull in the clutch lever and see how much lift you have. You don't need much but the plate should lift square to the friction plate. If it lifts OK then it may not be lifting evenly. Engage a gear and rotate the rear wheel. (This is easier if you have the spark plugs removed or the valve lifter lever engaged. I pull the handlebar lever back and hold it back with a re-usable tie-wrap.) Check to see if the plate wobbles as it turns. If it does then the spring spacers may not be all the same lengths or the springs may be of different lengths. Remove the springs and check spring and spacer lengths. There are ways to help the plate lift square. Timetraveller produced a needle roller bearing that helps. I shortened the clutch pushrod and used an old valve (from an Austin mini?) to help keep things square. [/LIST] At this stage you are looking at more dismantling:- [LIST=1] [*]Have look and see if there is oil in the clutch drum or on the clutch shoes. If you have oil here then it may be that oil is finding its way along the mainshaft. There should be a seal C18 fitted to the C3 shoe carrier. Some sealant applied to the splines when assembling can sometimes help here. [/LIST] If you have already fitted a 'D' shock absorber you know that to check the next two seals requires the removal of the clutch drum:- [LIST=1] [*] There is also a seal PD25 between the two bushes in the chain wheel. [*] There is a large diameter seal PD26/1 fitted in the outer case. [/LIST] On the brighter side, If there is no oil contamination you can remove the clutch shoes without much dismantling. If the linings look oil-free and in good condition then adjustment of the clutch plungers may be needed. Maybe that is enough to be thinking about for now. There are lots of posts on clutch problems. Sorting the 'wheat from the chaff' is tedious. Maybe a good starting point is here:- [URL='https://www.vincentownersclub.co.uk/threads/jig-to-hold-head-in-lathe.16283/page-4#post-148672'][U][COLOR=rgb(44, 130, 201)]https://www.vincentownersclub.co.uk/threads/jig-to-hold-head-in-lathe.16283/page-4#post-148672[/COLOR][/U][/URL] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Multi-Plate Clutches
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