So I recently rebuilt a Cb400f with 9000ish miles and it now has about 12000. It quickly developed an oil leak from what I thought was the metal plug for the oil gallery behind the left side crank cover. So I replaced the o ring in it but it kept leaking. Turns out it’s the left side crank oil seal. I’ve replaced all the oil seals on the engine when I rebuilt it. Could it be put in wrong? It looks ok. I’m just wondering if there is any internal problem with the crank that would cause a new seal to leak.
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