SOHC.co.uk Forums > CB350/400

CB350F crankshaft oil seal leak

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Bryanj:
That seal should have a small lip around the outer diameter on the inner edge which means you really need to split the cases, sorry for the bad news but given its not long been together I would estimate 2-3 hours to do it right

andut:
Oh no Roy !!!!   

Such a simple thing to do when you're mind's already thinking about the next step in the build.  As MCTID says, at least you know what's wrong and how to sort it !  I hope you get lucky with replacing it in situ, but you're right - there's a flange on inner side of the seal that will probably make it difficult for the new one.  It's not too bad to get back to splitting the cases - might seem like it now given the time to get where you are, but probably not too bad as everything is already clean and new when you break it down and reassemble !

Sure it'll be running very soon !!

Andy

mike the bike:
It's been a few years since I last rebuilt a 400 engine.  I thought there was a flange on the seal too.  That makes it a bit more tricky.  I would suggest slackening off all the crank case bolts until there's a 6mm gap then you can remove/refit without damaging the seal.
Good luck and take your time.

Clem2112:
Case halves will need separating, cleaning up and re-sealing with fresh Yamabond (or other silicone) or it'll leak somewhere else !

Chris400F:
What a mistake to make! But at least you have found it now rather than when the whole bike is back together.
Making some bespoke kit to replace the seal in situ might seem a clever way to do it, but it could take as long as the job
would take to do properly and even then might not work - if there is a flange on the seal it is there for a reason.
You would also know it wasn't done properly, which wouldn't be right given the time and effort you have spent on the rest of the bike.
I'd go with Mike's suggestion of slackening the crankcase bolts and try and do it that way, then reseal the cases.
Far less chance of damaging anything.

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