JD317 Front Seal

I have a Series I Kohler on my 317 that has just started leaking oil after I mow the lawn. I probably overfilled it by accident when I changed the oil but it has continued for several mowings. It starts to smoke after it gets hot (seems to blow some oil on the muffler from the breather) however, when it sets after being shut off it leaves quite a puddle of oil. It seems like the front seal might need replacing. Any suggestions or counsel? Thanks
 
Most likely building up crankcase pressure and blowing it out the breather. Time for a rebuild. I'm surprised you still have a Series 1 engine after 30 some years.
 

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