cam shaft seal

[crapper]

a while back , i asked about an oil leak (small but pesky)around the chrome head cover and someone said it probably was the rubber\plastic cam shaft seal along with some sugestions on remedies. tried the silicone and soap and still leaking.
wondering if someone had to get those things replaced and did the motor have to come out. there is absolutely no room between the frame and motor to get at the covers...
any info would be appreciated...........thanks