Overhead Valves

Most overhead valves are adjusted "hot"; that is, valve clearance recommendations are given for an engine at operating temperature. Before valve adjustments can be made properly, the engine must be run and brought up to normal operating temperature.

To adjust a valve, remove the valve cover and measure the clearance between the valve stem and the rocker arm. Loosen the locknut and turn the adjusting screw in the rocker arm, as shown in figure 3-74. On engines with stud-mounted rocker arms, make the adjustment by turning the stud nut.