Method and apparatus for adjusting engine valve clearance

Details Method and apparatus for adjusting engine valve clearance Method and apparatus for adjusting engine valve clearance

2007-03-30

2010-06-22

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Rocker

C029S888200, C074S559000

Reexamination Certificate

active

07739990

ABSTRACT:
A rocker arm is mounted to an eccentric shaft. The shaft has a pair of ends which are mounted to corresponding supports. The shaft has a rocker arm seat portion which is eccentric to the end portions, whereby when the position of the shaft is changed by rotating it, the position of the rocker arm changes. The shaft ends are mounted to riser blocks which are connected to a support structure. The shaft ends may be clamped in a fixed position relative to the riser blocks, or unclamped to permit the shaft to be rotated. When rotated, the position of the rocker arm may be changed up or down relative to the support structure and a valve stem which the rocker arm is intended to engage, thereby adjusting valve clearance.

REFERENCES:
patent: 2880711 (1959-04-01), Roan
patent: 4643141 (1987-02-01), Bledsoe
patent: 5148783 (1992-09-01), Shinkai et al.
patent: 5205501 (1993-04-01), Alvarez
patent: 6712031 (2004-03-01), Harada et al.
“Jim Cook Performance—Tech Notes—About Valve Lash”, http://www.jimcookperformance.com/TechNotes/TN7ValvLash.html, Circa 2003, 5 pages.
Bill Marvel and Bill Scott, “The Rest of the Story”, http://www.prime-mover.org/Engines/Marvel/tbo3.html, Circa 1998, 17 pages.

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