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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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<blockquote data-quote="timetraveller" data-source="post: 159594" data-attributes="member: 456"><p>Hi Michael, I am surprised that the bearings are wider than the eyes. I have assembled fifty or sixty of these and on those it has always been that the two bearings, 7 mm wide each one, total 14 mm, are narrower than the eyes. You will notice that there is a 0.5 mm raised section on the inside face of the long part of the concentric and on the face of the washer which faces into the bearings. These were designed in to take up some of the side clearance and to centrlise the bearings in the eyes. The rear reason for the inclusion of the shims is that after all this time the lower links are not all the same shape whereas all the new steering heads are, or should be, the same thickness. The shims are intended to fit wherever they need to in order to cut down any side clearance. I supply three shims for each side, one off of each of 0.1 mm, 0.25 mm and 0.5 mm. I fit them where ever they are needed to take up any side clearance and to try to ensure that the lower link is as near central on the base of the new steering head. No one has ever asked for more shims and there should be no need for any extra shims. In fact in general no one needs to use all six shims. So where does this leave you?</p><p>Could I ask you to fit the two bearings to each side and when pushing them in try to get them as central to the lower link eyes as possible. Then put the long part of the concentric in from the outside of the link and see if there is still clearance between the side of the eye and the outer side of the link eye. Note that the raised centre of the long part of the concentric should ensure that there is clearance. If not then try one of the shims, start with the 0.1 mm and then inspect it. If you are happy with that then push on the washer from the other side of the lower link eye ensuring that the 0,5 mm raised centre is facing the bearings. There should be clearance between this washer and the side of the lower link eye. Try to rotate the concentric in the bearings and check that the is clearance each side and that the concentric turns freely. If there is no clearance then use some of the shims to space the washer out fromwhere it is contacting the side of the link eye. When that is done do the same for the other side. When you have both sides assembled and turning freely check the clearance between the inside of the washer, that is the flat side, and the side of the new steering head. Additional shims are normally used to ensure that there is just about no clearance. Once you have done that please come back to me and let me know what you have found. There should be no need for any extra shims and normally there is no need to use all three supplied. Norman</p></blockquote><p></p>
[QUOTE="timetraveller, post: 159594, member: 456"] Hi Michael, I am surprised that the bearings are wider than the eyes. I have assembled fifty or sixty of these and on those it has always been that the two bearings, 7 mm wide each one, total 14 mm, are narrower than the eyes. You will notice that there is a 0.5 mm raised section on the inside face of the long part of the concentric and on the face of the washer which faces into the bearings. These were designed in to take up some of the side clearance and to centrlise the bearings in the eyes. The rear reason for the inclusion of the shims is that after all this time the lower links are not all the same shape whereas all the new steering heads are, or should be, the same thickness. The shims are intended to fit wherever they need to in order to cut down any side clearance. I supply three shims for each side, one off of each of 0.1 mm, 0.25 mm and 0.5 mm. I fit them where ever they are needed to take up any side clearance and to try to ensure that the lower link is as near central on the base of the new steering head. No one has ever asked for more shims and there should be no need for any extra shims. In fact in general no one needs to use all six shims. So where does this leave you? Could I ask you to fit the two bearings to each side and when pushing them in try to get them as central to the lower link eyes as possible. Then put the long part of the concentric in from the outside of the link and see if there is still clearance between the side of the eye and the outer side of the link eye. Note that the raised centre of the long part of the concentric should ensure that there is clearance. If not then try one of the shims, start with the 0.1 mm and then inspect it. If you are happy with that then push on the washer from the other side of the lower link eye ensuring that the 0,5 mm raised centre is facing the bearings. There should be clearance between this washer and the side of the lower link eye. Try to rotate the concentric in the bearings and check that the is clearance each side and that the concentric turns freely. If there is no clearance then use some of the shims to space the washer out fromwhere it is contacting the side of the link eye. When that is done do the same for the other side. When you have both sides assembled and turning freely check the clearance between the inside of the washer, that is the flat side, and the side of the new steering head. Additional shims are normally used to ensure that there is just about no clearance. Once you have done that please come back to me and let me know what you have found. There should be no need for any extra shims and normally there is no need to use all three supplied. Norman [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
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