Gm Global Technolgoy Operations, Inc.

John A Gural

Earl R Fischer

Donald J Lamirande

Michael D Griffin

John W Moulds

A throttle valve shaft projecting from a boss on an internal combustion engine throttle body has a nut which is adjustable for establishing a selected clearance between the nut and the boss to thereby limit end float or axial displacement of the shaft. A lever or other retainer secured to the shaft has an interfering engagement with the nut to prevent rotation of the nut about the shaft and thereby maintain the selected clearance between the nut and the boss.

Valve shaft end float control

A vacuum motor suitable for actuating a carburetor choke valve has primary and secondary stages responsive to separate vacuum signals. The secondary stage is carried by the primary stage and has a valve which opens upon full retraction of the primary stage to permit application of a vacuum signal to the secondary stage.

Two-stage vacuum motor

In an air valve carburetor, additional fuel for cold start enrichment is provided by a primer pump operated by the throttle when the throttle is opened completely. The primer pump discharges through a jet traversed by the air valve, and the air valve is opened partially to expose the jet when the throttle is opened completely.

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Pittsford, NY, United States of America

John A Gural