Valve Spring Testing

VALVE SPRING IDENTIFICATION





Fig. 12

The valve springs are of two different lengths and are wound in different directions. The valve springs are color coded: the intake spring has a right hand coil direction with orange dye on the top coils and the exhaust spring has a left hand coil direction with yellow dye on the top coils (Fig. 12).

TESTING VALVE SPRINGS





Fig. 13

When valves have been removed for inspection, reconditioning or replacement, valve springs should be tested (Fig. 13). As an example; the compression length of the spring to be tested is 38.00 mm (1.496 inch). Turn table of Tool C-647 until surface is in line with the 38.00 mm (1.496 inches.) mark on the threaded stud and the zero mark on the front. Place spring over stud on the table and lift compressing lever to set tone device. Pull on torque wrench until ping is heard. Take reading on torque wrench at this instant. Multiply this reading by two. This will give the spring load at test length. Fractional measurements are indicated on the table for finer adjustments. Refer to Valve Spring; Specifications to obtain specified height and allowable tensions. Replace springs that do not meet specifications.