Valve inserting apparatus for an internal combustion engine

摘要

A valve inserting apparatus for an internal combustion engine has a cylinder head of the engine supported by a jig such that its surface on a combustion chamber side is positioned facing upward and the longitudinal axis of a valve guide assembled to the cylinder head is kept vertical while a valve is inserted into the valve guide from above. The valve inserting apparatus includes a valve inserting unit for moving upwards and downwards. A valve holding device detachably, swingably, holds the valve with its head portion facing upward. A valve push-in device is provided and a suction device moves into contact with a lower end of the valve guide. The push-in device comprises an upwardly and downwardly movable push rod having a weight attached to the upper end portion. The push rod abuts the head portion of the valve from above. The valve inserting unit includes a first detector for detecting whether or not the push rod is at a position higher than a first predetermined reference position, such that the position of the push rod when the push rod in abutment with the valve and the valve inserting unit has been lowered to a predetermined position where the lower end of the valve has been inserted into an upper end of the valve guide to a predetermined depth. The valve inserting device further includes a second detector for detecting whether or not the push rod is at a position lower than a second predetermined reference position, that is, the position of the push rod when the lower end of the valve reaches the stem seal.