SOHC.co.uk Forums > CB500/550

Crank bearings/shells

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Mitchv60:
Evening chaps :)

My engine has been stripped and I've had the cases vapour blasted ready for a repaint.All the internals are in excellent condition but a couple of the crank shells are slightly marked.
To be honest they would be fine but as the motor is apart we will replace them as its a no brainer.
Is there some markings on the crank to say what size(colour)are required for replacements,the only marks we can seen anywhere is on the rear of the lower engine case and that is AAAA.

Bryanj:
The crank etchings are very difficult to see but the genuine Honda manual points you at the correct place

ginger_jim:
I have this advice after going through the same issues with a CB750 engine.  Send the crank to SEP in Kegworth.  Even if you fit the new shells you are still supposed to measure measure the gaps so any wear will mean extra tolerance.  SEP measure everything for you and supply new shells for around 200 quid (ex VAT).  Everything is returned packed and pre-lubed.  You will spend something in that region just to get the shells from DS.  At least this way you know everything will be 100% ready for rebuild!

ginger_jim:
i should just add that the price is for the Big End and Mains.

ginger_jim:
Hi Oddjob, I totally take your point.  Incidently I only had to send the crank and the letters from the crankcase.  SEP have all the measurements to work out the clearances.  I guess my problem was that I could not be 100% sure of the big end markings and this route provided me with a bit of peace of mind!  If I could have been sure of the code mapping there would have been no need as you say.

Regards, Jamie

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