SOHC.co.uk Forums > CB350/400

Gearbox blanking seal.

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royhall:
Is it possible to change the main shaft oil seal (34x9mm) on a 400F without splitting the cases. Its the seal that is a blacking piece with an oil supply right underneath (just in front of the sprocket). My mates bike is weeping oil past this seal. Funny, I was only talking about that same thing 2 days ago, think I will also check that seal on my 350F.

Bodd:
Do you mean this ?

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mike the bike:
I'm sure that seal's got a locating tab sticking out and possibly a flange as well to keep it firmly located.   Whereas removing it with a screwdriver is do able,  refitting the new one is an unlikely prospect without opening up the crankcases a tadge.

Bodd:
It has got a tab sticking up but no flange (No 272 in the picture), I suppose how flexible it is will determine if it will go in without splitting/lifting the cases.

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royhall:
That's the one Bodd. If its the same as the 350F it definitely has a dowel shape tab on it.There's a quite large weep of oil coming out at about the 5 o'clock position, right about where the oil feed is under the seal. Do you know of anybody that has successfully changed that seal without a stripdown, or a way of re-sealing it in situ. Don't mind helping him with a seal change but I don't want to get involved in his stripdown, don't have the time at the moment. Think I will get him to order a new seal then I can have a look at how flexible they are etc. Cheers.

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