Valve Caps: Description

Caps with one projected tip and one flat end are installed with the flat end toward the inside of the valve body.
Caps with a projected tip on each end are installed with the smaller tip toward the inside of the valve body. The small tip is a spring guide.

Fig 1: Identifying Valve Caps Installation Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Caps with one projected tip and hollow end are installed with the tip toward the inside of the valve body. The tip is a spring guide.

Fig 2: Identifying Valve Caps Installation Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Caps with hollow ends are installed with the hollow end away from the inside of the valve body.
Caps with notched ends are installed with the notch toward the inside of the valve body.
Caps with flat ends and a hole through the center are installed with the smaller hole toward the inside of the valve body.

Fig 3: Identifying Valve Caps Installation Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Caps with flat ends and a groove around the cap are installed with the grooved side toward the outside of the valve body.

Fig 4: Identifying Valve Caps Installation Position
Courtesy of AMERICAN HONDA MOTOR CO., INC.