BLOW-BY GAS EXHAUST UNIT FOR FOUR-STROKE OUTBOARD ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a blow-by gas exhaust unit preventing oil leakage for a four-stroke outboard engine. SOLUTION: A blow-by chamber forming case 12 is arranged so as to intersect the longitudinal line X-X of the outboard engine aligning with the crankshaft, and a return type blow-by gas flow passage 18 comprising blow-by gas flowing passage sections 18A and 18B is formed by a partition wall 17 intersecting the longitudinal line X-X in a blow-by chamber 15 in the chamber forming case 12. The return flow passage 18a of the return type blow-by gas flow passage 18 is formed on one side of the longitudinal line X-X. A blow-by gas jet sections 16 is provided in the bottom section of the blow-by gas flowing passage section 18A, and a blow-by gas exhaust section 25 is provided in the blow-by gas flowing passage section 18B. An oil discharge section is provided in the bottom section of the blow-by chamber 15.