SOHC.co.uk Forums > CB350/400
Main Bearing Shells proud of Crankcases
simco1964:
OK, will give it a go :D
royhall:
--- Quote from: hairygit on April 18, 2017, 06:25:35 PM ---Try fitting the bearings to the top casing as well, then place on top of the lower casing, and GENTLY push them together, the chances are the bearings will push down into the correct location, but do be gentle, as you don't want to damage the shells trying to force them.
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--- End quote ---
Not sure that's going to help Hairy..... He should already have had the crank and cases together and torqued down to get the Plastigauge readings. Something is not right there? It may only be the natural spring in the shells pushing them back out when the casings are released. Use a very soft mallet and try gently tapping the edges down, don't use anything solid or you will pean over the shell edges.....The journals in the pictures don't look too bad although there is some evidence of pick-up. Unfortunately these cranks are not re-grindable as there's no oversize shells for them. You can however get the journals micro polished to help remove very minor damage. Never had it done myself but remember Rick Partington (Classic Bike mag) having his done when he featured the 400/4 rebuild. Somebody on here will know.
simco1964:
Hi Roy,
Can you not use a different coloured shell to reduce clearance? ie go from yellow to a green?
Simon
royhall:
Not really. If you look at the sizes there is only a couple of thou between the largest and smallest. Thats just there to take up any manufacturing errors.
simco1964:
What can I do to improve the amount of clearance?
I just don't have the experience as this is my first restoration project!!
Regards
Simon
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