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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cracked FF3 Lower Link?
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<blockquote data-quote="Elanman39" data-source="post: 163180" data-attributes="member: 5453"><p>I have now found out that the grease nipple fitted in the centre of the forward part of the FF3 lower link on my bike is not a standard feature, it has been added at some point by a well meaning previous owner. I think this is the root cause of the crack: injecting grease under high pressure into such a large diameter bore creates huge stresses as the calcs above showed and it would not normally be considered good Engineering practice according to a design manual I've been looking at. If such an arrangement is used it's recommended that the maximum pressure is effectively limited by cutting grooves in the bearing faces to allow grease to escape and show to the gun operator that it's time to stop. There were no grooves in the bushes on my link; there are now, on the leading edge where the loads are lowest.</p><p>I would doubt that a similar failure will be seen on a link without this additional grease nipple fitted.</p><p>Thanks for all your thoughts and suggestions, I hope I haven't frightened anyone. Nick</p></blockquote><p></p>
[QUOTE="Elanman39, post: 163180, member: 5453"] I have now found out that the grease nipple fitted in the centre of the forward part of the FF3 lower link on my bike is not a standard feature, it has been added at some point by a well meaning previous owner. I think this is the root cause of the crack: injecting grease under high pressure into such a large diameter bore creates huge stresses as the calcs above showed and it would not normally be considered good Engineering practice according to a design manual I've been looking at. If such an arrangement is used it's recommended that the maximum pressure is effectively limited by cutting grooves in the bearing faces to allow grease to escape and show to the gun operator that it's time to stop. There were no grooves in the bushes on my link; there are now, on the leading edge where the loads are lowest. I would doubt that a similar failure will be seen on a link without this additional grease nipple fitted. Thanks for all your thoughts and suggestions, I hope I haven't frightened anyone. Nick [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Cracked FF3 Lower Link?
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