| 摘要 |
PURPOSE:To enable sure sealing and easy removal by providing a ring-shaped reinforcing washer on the upper part of a cylindrical body part with which the outer peripheral surface of a valve stem guide is covered as well as a valve spring seat on the lower end open side of said cylindrical body part. CONSTITUTION:A valve stem guide 7 is forced into an aperture formed in an interstructure comparting between a suction and exhaust passage formed through a cylinder head and a upper rocker arm chamber. And, a valve stem 9 is slidably inserted into the guide hole of this guide 7. Further, a spring 11 is inserted along a flange 7a, while a seal 20 is fixed on a head part 7b. The seal 20 comprises a cylindrial body part 21 with which the outer peripheral surface of the head part 7b is covered, a constriction part 22 slidably making contact with the outer peripheral surface of the valve stem 9, a shoulder part 23 connecting with these respective parts 21, 22, a ring-shaped reinforcing washer 24 arranged inside said shoulder part, and a seat 25 arranged on the lower end open side of the cylindrical body part 21. |
