| 摘要 |
An engine includes a cylinder head having a valve-operating chamber. A cylinder head is coupled to a cylinder block by a plurality of fastening bolts. A head cover is coupled to the cylinder head to close the valve-operating chamber. A ventilating gap is defined between a face of the cylinder head fastened by the fastening bolts and a bottom wall of the valve-operating chamber. An operating bore is provided in the bottom wall to enable insertion of at least one of the fastening bolts and a tool for tightening the fastening bolt. A plug is integrally provided in the head cover to be liquid-tightly fitted into the operating bore. Cooling of portions around the bottom wall of the valve-operating chamber is improved, while the cylinder head can be fastened to the cylinder block from the side of the valve-operating chamber by the fastening bolts.
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