[AT] Kohler engine update - still having trouble

[Mike]

Several days ago, while mowing with my Simplicity Sovereign, Kohler 
CH18S) I completely blew out the front oil seal. Today, I replaced the 
seal, cleaned the carb, and put the crankcase vent tube back where it 
belongs. I figured since the tube had been exposed that I would change 
the oil and filter as well. When I drained the oil, I noticed it was 
very thin,  so I stuck a finger in the stream, and sure enough it was 
raw fuel. I put everything back together,and it started right up. I made 
two passes around the yard, and it was smoking so I check and it was 
already pushing oil past the seal. For some reason I am creating too 
much crankcase pressure. I pulled the crankcase vent tube and check for 
any obstructions, I found none. Any ideas what to check for? If I keep 
running it, it will just blow another seal. Thanks in advance.

Mike M