SOHC.co.uk Forums > CB350/400
Main Bearing Shells proud of Crankcases
royhall:
You could try a "Does anyone live in Devon" post and see if anybody is near to you. A lot of members are willing to call round in person to have a look. It can be difficult to advise correctly on just a few forum photo's. Cheers Roy.
Clem2112:
Simple check I would try.
Put new and old shells side by side, edges down, to see if they match for size and shape - are the new ones slightly out of round?, even if they are not perfectly circular they should be ok when clamped in between the casing halves.
royhall:
Like I said in the earlier post, I dont think you have a problem with the shells standing proud as you have already had it together to get a Plastigauge reading so they must push down correctly. They have probably just sprung back out when you removed the crank. All you need is a solid opinion on the condition of the crank journals and your good to go. If somebody in the know lives near you being in front of the crank makes all the difference. You cant really get the feel and look from photo's. This is an example of crank polishing. https://www.youtube.com/watch?v=mHVzyvszbhw Its the first picture you posted (with the Plastigauge) that had me concerned. Our resident expert on these things is BryanJ. Give him a PM and see what he recommends. Cheers Roy.
hairygit:
--- Quote from: Clem2112 on April 20, 2017, 07:59:43 AM ---Simple check I would try.
Put new and old shells side by side, edges down, to see if they match for size and shape - are the new ones slightly out of round?, even if they are not perfectly circular they should be ok when clamped in between the casing halves.
--- End quote ---
That's why I suggested putting the crankcase halves together, to see if it all drops into place! Chances are at some point since manufacture they have had had something on top of them that has caused them to open up a fraction, my guess would be something dumped on top of the package they were shipped to you in, bloody postal companies! But, provided they aren't creased (easy to spot!) they should be fine to use. I'm about half an hour from you (A little village 5 miles S.E. of Exeter) but due to health issues driving is out of the question at the moment, but if you're not in a desperate hurry I'm more than willing to hop on a bus or train and come have a look for you.
simco1964:
Hi,
If its any easier, I could pop up and see you? I drive though Woodbury on the way to Budleigh Salterton (walking), would be better on the bike !! Have emailed BryanJ on RoyHall's recommendation to see what he thinks?
Going to reassemble crankcases with crank in situ and check if casings are flush with each other then hopefully i'll know that its just the springing out the casings abit.
But what i also need to know is if I can use the next shell size up to reduce the amount of clearance?
Simon
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