B & S Gas in Oil

[CM Briggs]

Craftsman B&S 18.5 HP OHV
Have problem with gas getting into the oil + oil into the carb from the breather tube. Replaced carb, changed oil & filter. Engine started right up, ran great for a couple of minutes, then engine started smoking as before. Heavy oil vapors again in the breather tube going into the carb. Replaced oil was at the correct level and gas shut off already was installed. Anybody have any suggestions other than a cracked piston or head gasket?

 

[ILENGINE]

Which variation of 18.5 engine do you have by model number. They have made several different configurations of those engines.

 

[CM Briggs]

Which variation of 18.5 engine do you have by model number. They have made several different configurations of those engines.

31H777 0202E1 2E00245

 

[EngineMan]

Check valve seats and head gasket also piston rings