SOHC.co.uk Forums > CB350/400
Honda CB400four crankcase roller bearing wear
eem46:
Dear All, that is the tricky parts of buying a empty set of crankcase, I dont know and I cant prove they are/were a matching set. Looking at other crankcases the marks are always in the lower crankcase. By the forces?
eem46:
Can you ever found out if a set of crankcases are matching? No secret Honda stamp?
Bryanj:
Nope, but over many years you usually find if they aint a pair at least one of the many machined holes you will find you can feel a step at the join
McCabe-Thiele (Ted):
--- Quote from: eem46 on November 11, 2021, 07:13:25 PM ---Can you ever found out if a set of crankcases are matching? No secret Honda stamp?
--- End quote ---
You raise an interesting point - Honda did a nice big clear lettering stamp on the lower crank case with no alpha/numerical marks to say this crank case top matches the crank case bottom.
In my head I find it difficult to see how a rotating bearing would not mark both halves of the crank case in a similar though not necessarily identical manner - then again you mention the forces at work - rotational from the gearbox but with the down forces at the same time from the pistons on the crank maybe that explains why the marks are mainly on the bottom half - that makes sense.
If you have seen other cases where the marks seem to be always on the bottom half then that supports your explaination.
Bryanj:
Rod shells are always more worn on rod side not cap, it takes 3 of the 4 strokes load, never really noticed any difference on mains and as ball/roller casings are not supposed to totate in housing i have no idea
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