SOHC.co.uk Forums > CB500/550
Crank not rotating
alexdecker:
--- Quote from: Bryanj on May 10, 2022, 08:01:16 PM ---Sizes are just about within spec but markings on shells wory me.
I suspect fitting new of same colour would give tighter tolerance
--- End quote ---
Yes, definitely. I was hoping they would be within spec, because then I could replace them with new ones of same color (if I can get them), and all should be well. But is that the best course of action? Does some of them need to be replaced with tighter tolerances?
murdock:
alex , what you need is a plastigauge test to see if they are all within tolerance.
Oddjob:
Those are done using plastigauge Murdock.
I'm not a fan of plastigauging old shells, sure you get an indication of the clearance but it doesn't tell you what's worn, just that something is. However if you fit a new set of shells and the plastigauge them, the results will show you just how worn the crank is, if it is at all. So for instance, you fit new shells and the clearance is still over spec, you then know that fitting the next size shell up is the potential answer. One good reason for keeping a new set of yellow shells around, you fit them, get the clearance they give and then calculate the colour required to get the clearance back into spec.
alexdecker:
--- Quote from: Oddjob on May 11, 2022, 12:18:17 AM ---Those are done using plastigauge Murdock.
I'm not a fan of plastigauging old shells, sure you get an indication of the clearance but it doesn't tell you what's worn, just that something is. However if you fit a new set of shells and the plastigauge them, the results will show you just how worn the crank is, if it is at all. So for instance, you fit new shells and the clearance is still over spec, you then know that fitting the next size shell up is the potential answer. One good reason for keeping a new set of yellow shells around, you fit them, get the clearance they give and then calculate the colour required to get the clearance back into spec.
--- End quote ---
I totally see the reason in that. But getting an entire set of yellow new shells for that purpose and then an entire set of something else possibly sounds very expensive and not that feasible. I could understand from earlier answers, that measuring the crank is not an accurate enough option. So if measuring the crank is not an option, and going by plastigauging old shells is also not recommended, what can I do then?
alexdecker:
--- Quote from: murdock on May 10, 2022, 09:19:45 PM ---alex , what you need is a plastigauge test to see if they are all within tolerance.
--- End quote ---
Those posted numbers were the plastigauge measurements :)
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