Small Engines (Lawn Mowers, etc.): Oil leak from my snow thrower, crankshaft seal, pan gasket

Question
Hi John, last night I noticed I had oil coming from the crankcase onto the axle, and dripping to the ground from there. Any ideas on what might be causing this.
Sears Model 536.887751. It's a 7.75hp machine. It has a Tecumseh engine.
Thanks,

John Flynn

Answer
 Hello John:

 Send me the Model Numbers Off the Engine, Please. The Mower Model Breakdown/IPL Doesn't Include the Engine Model Numbers. With the Engine Model Numbers I can Locate a Breakdown/IPL and Better Assist you. However, the Oil Pan Gasket May be Leaking. The Crankshaft Seal May be Leaking. The Crankcase Vent/Breather may be Bad and need Cleaning or Replaced. Thanks.

 Respectfully

 John