Twelve-point rocker-arm adjusting nut

Details Twelve-point rocker-arm adjusting nut Twelve-point rocker-arm adjusting nut

1993-06-28

1994-06-28

Cross, E. Rollins

Internal-combustion engines

Poppet valve operating mechanism

Rocker

123 9043, F01L 118

Patent

active

053237412

ABSTRACT:
A twelve-point rocker-arm adjusting nut (10) designed to be threaded into a rocker-arm stud to adjust the height/clearance between a valve and a rocker arm (44). The nut (10) consists of an axially elongated cylindrical body (12) and a hex-socket tipped set screw (32). the nut (10) has a threaded bore (20) therethrough that extends to near the lower surface (18) of the nut. From this lower surface extends upwardly a thread-free stud entry port (24). Around the upper section of the nut (10) is located a twelve-point wrenching section (26) that includes at its lower end a wrench non-slip lip 30. The wrenching section (26) serves both as a wrench gripping section and for directing oil to provide cooling for the rocker arm base and pivot ball washer (46) interface. To operate the nut (10), a standard twelve-point wrench is used to rotate the nut until the proper height/clearance between the valves and the rocker arm is achieved. A T-handle hex key is then inserted into the hex socket (34) of the screw (32) and rotated to allow the tipped end of the screw to tighten against the upper surface of the stud (40) thus, holding the nut (10) in place.

REFERENCES:
patent: 3189011 (1965-06-01), Briggs
patent: 3251350 (1966-05-01), Thompson
patent: 4561392 (1985-12-01), Jette
patent: 4784095 (1988-11-01), Golding et al.
patent: 4799464 (1989-01-01), Patel et al.
patent: 4856467 (1989-08-01), Kronich
patent: 5190000 (1993-03-01), van Schaik et al.

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