Hi, Durand.Welcome to iboats. Do you mean the gearcase? There is no oil in the crankcase except what flows through as part of the fuel mix.Sounds like you have a fuel mix leak and the gas is evaporating off, leaving the oil.Tell us more about what you see and what you have done.
Durand,JB, is right. No crankcase oil to be blown out.However, a mixture of fuel and oil may be leaking or being sprayed in the cowl. There are several place to look. Can you tell us if it seems to be toward the front or back, which side, etc?