SOHC.co.uk Forums > CB500/550
Crank bearings good or bad
Acro1985:
Definitely a 1 on four of the webs and an A on three of the website. But will see if I can find anymore after giving it a wash and trying different lighting.
Is it 4 letters and 5 numbers on each web or is it 4 letters and 5 numbers in total spread across all the webs
McCabe-Thiele (Ted):
It might be worth trying to get hold of a pair of Brown shells for your mains then using Plasigauge see what the clearances are. Likewise a pair of maybe green big end shells & do the same before you splash out on a full set.
I'll have a look in the morning to see if I kept any of my old used marked mains shells.
Can't help with big ends as I had to buy a used crank that came with good big end shells & conrods.
I'll PM you if I find still have them.
PS After talking to a member who is currently suspended he told me If you do find a colour on the mains shells the odds are that if all the shells have the same batch number chances are they are all the same colour as well. Same logic for the big ends.
Bryanj:
Its a letter and number for each combination so as 5 B on case will be 5 numbers on crank, which means 4 letters for big ends so no confusion on crank therefore letters on conrods, you will find numbers on rods as well which are weight codes.
It is all explained in the workshop manual downloadable from ashs dropbox/alladins cave.
I have for my use built an engine with all black shells and run it in carefully, the tolerances quoted by Honda, as i understood the tech talks, are so that a new engine does not require the carefull running in of old but only bedding in before using hard, in fact Kawasaki with the Z1000 fell foul of people treating them too gently to start, glazing the bores and so burning oil. They were reboring under warantee and telling owners not to molycoddle the motors
Laverda Dave:
If you use petrol to clean the crank webs you should just be able to make out the codes with a bit of luck but it can be very difficult to see as they are feint and you have to move the crank around in the light to see them and maybe use a torch as well. I had one crank where I couldn't see them at all.
McCabe-Thiele (Ted):
I've sent you a PM I only have a pair of used Green Mains for a 500 for you to try for size using Plastigauge, sorry no used Browns or used big end shells with markings.
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