ENGINE

摘要

The valve mechanism (7) drives the exhaust valve (4) with the valve lifter (5) and the exhaust camshaft (6). In the structure, oil is supplied to the journal (13) and the shaft opening of the bearing (18) by way of the oil passage (14) formed in the exhaust camshaft (6). The auxiliary oil passage (24) has one end opened to the oil collecting part (21) formed in a part of the shaft opening and the other end opened in the side wall (15d) of the bearing (18) adjacent to the valve lifter (5). The guide wall (25) formed in the side wall (15d) leads oil from an opening of the auxiliary oil passage (24) to a part (lla)of the valve lifter (5) generating the striking noise.