SOHC.co.uk Forums > CB350/400
400/4 main bearing shells
Oddjob:
Sorry Matt but I don't have any 400 shells, I have LOADS of 500/550 shells, more than any single place in the world I think. Well over a hundred of them. Certainly more than DS or CMS. I'm very sad :-[ :-[ :-[
Matt_Harrington:
Thanks - I'll nip down to the guy doing the case cleaning tomorrow and get the letters off the case so I can get shells on order (or hunt for them!!)
Are the letter stamps in the same sequence as the journals?
So, as an example, (looking at the chart) a crank journal of 31.98mm would require a 'black' shell set for 'c'
Is it best to check with plastigauge before final assembly?
Trigger:
always plasti gauge up everything.
McCabe-Thiele (Ted):
--- Quote from: Matt_Harrington on June 22, 2023, 06:49:31 PM ---Thanks - I'll nip down to the guy doing the case cleaning tomorrow and get the letters off the case so I can get shells on order (or hunt for them!!)
Are the letter stamps in the same sequence as the journals?
So, as an example, (looking at the chart) a crank journal of 31.98mm would require a 'black' shell set for 'c'
Is it best to check with plastigauge before final assembly?
--- End quote ---
Yes the codes are in sequence from left to right so the first code is M1 etc.
Personally rather than rushing out & buying a load of shells - some might not be right.
I would mike up the crank journals then check the parts book for the possible shell codes for your crankshaft.
I would then buy one pair of say Brown shells if they look to be correct in the tables then fit those in the casing codes for C and Plastigauge each C journal in turn.
The individual clearances would then tell you if the clearances are correct. Where the clearances are too large (due to wear) a Black shell would be needed.
When I did my 400 the casing codes were CAABA the shells I ended up fitting were in order M1 Black, M2 Green, M3 Green, M4 Brown, M5Green.
Matt_Harrington:
Thanks Ted. A wise step I think. I'll re-visit this thread after a little bit more investigation.
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