SOHC.co.uk Forums > CB500/550
Crank not rotating
alexdecker:
Also, I measured the crank journals for the main bearings. My case is BCBCB. I got these measurements in mm:
1. 32,96
2. 33
3. 32,95
4. 33
5. 32,95
Does these numbers make sense? The shop manual only shows this in inches - does an official source with metric measurements exists, that I can use to determine what color bearings? The colors I pulled out, from 1 to 5, was: Brown, Green, Brown, Green, Black
McCabe-Thiele (Ted):
Make sure the conrod surface where the shells sit is nice & clean - then I would Plastigauge all the bearings this gives you an accurate clearance measurement for the journals that you can check against the manual tollerances charts.
alexdecker:
--- Quote from: McCabe-Thiele (Ted) on May 08, 2022, 04:27:54 PM ---Make sure the conrod surface where the shells sit is nice & clean - then I would Plastigauge all the bearings this gives you an accurate clearance measurement for the journals that you can check against the manual tollerances charts.
--- End quote ---
But can I still use plastigauge as an accurate measurement when both the bearing and the journal is worn? Then the numbers might not correspond to the correct size when buying new shells? Or am I misunderstanding something?
Bryanj:
If the clearance is still inside tollerance then they are safe to reuse
Seabeowner:
--- Quote from: alexdecker on May 08, 2022, 04:26:31 PM ---Also, I measured the crank journals for the main bearings. My case is BCBCB. I got these measurements in mm:
1. 32,96
2. 33
3. 32,95
4. 33
5. 32,95
Does these numbers make sense? The shop manual only shows this in inches - does an official source with metric measurements exists, that I can use to determine what color bearings? The colors I pulled out, from 1 to 5, was: Brown, Green, Brown, Green, Black
--- End quote ---
The crank journals when new go from 32.98 - 33.00mm. Class 1 is 32.99 - 33.00. Class 2 is 32.98 - 32.99. Presume this stayed consistent through all 500/550s.
Only way to get accurate clearance on a used motor for the DIYer is with plastiguage really.
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