| 摘要 |
PROBLEM TO BE SOLVED: To keep the capacity of an oil sum part by mounting a connection case to a lower side of a guide exhaust part, and disposing the oil sump part between right and left walls of the connection case. SOLUTION: A cylinder head 36 is mounted to a guide exhaust part 7 in a non-abutting manner. A connection case 21 is connected to a lower side of the part 7. The case 21 is formed with an oil sump part 81, an exhaust gas passage space 82, an idle expansion chamber 83, a front side upper chamber 84 and a front side lower chamber 86. The oil sump part 81 is opened at its upper surface and is formed between right and left side walls of the case. With the constitution wherein the oil sump part 81 is formed between the right and left side walls of the case 21, even if a length of the oil sump part 81 in the forward and reaward direction is made short, the capacity can be increased as high as possible. |
