ligatron

Alright, so I'm attempting to replace the tach drive oil seal on my 1978 xs400-2e. The valve cover is off and I cannot figure out how to disassemble the tach drive in order to get the seal out and the new one in. Any suggestions?

Well, one more picture of oil leaking through. Has anyone seen this before? I'd like to avoid taking the valve cover back off again. Notice the oil building up under that rubber stopper (not sure if that is the correct part description) in the center of the picture. What is that thing? What would be causing oil to leak through there? There does not appear to be leaks from any other place around the valve cover.

Thanks for the suggestions again drewpy. I'll be picking up some Yamabond 4 from a local dealership here soon. I'm hoping none of that silicon permatex dried up and made it down into the head.

Thanks for the replies everybody. It's been a few weeks, but I have replaced the head gasket and the other seals that were suggested. The service manual instructed me to use liquid gasket on the valve cover when reinstalling it. I ended up using Permatex Black After I assembled everything back together, I had leaks from the valve cover. Any advice on how to use this stuff? Should I be using something different?

I'm having a hard time pinpointing exactly where all of this liquid is coming from. Any thoughts?