SOHC.co.uk Forums > CB350/400

Not fully understanding Big End Bearings & colour codes.

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waffey:
Ted, apologise for jumping on your thread but looks like we are in the same place.

Oddjob, I've struggled to ID any markings on the crank except one which looks to be A1. So I'm stuck and not sure what i should do next. I have a Parkside micrometre but I'm doubting it as it reads for example 32.18 but if I read the the manual I should be looking for that extra 0 i.e. 32.018. Discussed with my friend and he question the tolerance in the manual. I cant see any real colours on the bearings either....

Anyhow, I now think I need to take the crank and conrods to a local engineering firm to get measurements then i can work out the correct bearings i.e. if the crank pin is 32.018 and the conrod allowance is 35.016 then a need a GREEN bearing?????

Nurse Julie:
Waffey. The tolerance scale in the manual is correct. Your micrometer isn't fine enough to get the correct critical readings.

K2-K6:
A micrometer with vernier scale is required for finer resolution

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https://www.wonkeedonkeetools.co.uk/micrometers/how-does-the-scale-of-a-metric-micrometer-work

Link shows it used in practice.

K2-K6:
Although the above picture is inaccurate as the thimble scale shows 0.284 ish and the vernier shows 0.009  ::)

You'd think they'd get the illustration right if they are going to demonstrate it wouldn't you  ;D

waffey:
Just as I thought, I'll take it to an engineering firm for measurement.

thanks all

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