SOHC.co.uk Forums > CB350/400

Honda CB400four crankcase roller bearing wear

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eem46:
Dear All, I want to build up a new cb400f engine but checking the crankcases after washing them, I see and feel with my nail that the gearbox rollerbearing made markings in the crankcase. Is this bad? Did the bearings spin around, because of not enough pre tension? Can I use the crankcase? Shall I glue the bearings in with Loctite? Please advise. Kind regards Emiel

Nurse Julie:
Yes, it shows the bearing was spinning at some stage.

McCabe-Thiele (Ted):
As Julie says they certainly look like rotation marks a lot might depend on how bad they are as to whether you can use the casing again using something like Hondabond on assembly.

Personally I would be looking for some replacement casings - others here might have experience of this issue and be able to tell you the outcome that worked for them.

Bryanj:
Very rare occurance, what does the outside of the bearing look like and does it rotate smoothly?

2nd Q is is this going to be a low mileage occasional ride or a thrash it everywhere daily driver?

eem46:
Hi, I bought the empty crankcases with some spare parts. So sadly I have not the ‘matching’ bearings. It will be a low mileage bike, but all new engine parts. So if it is not worth it, or a big risk I will trash them. Loctite has nice versions to glue bearings, and fill gaps. Worst case I need a new set, which is a shame.

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