Inspection

1. Whenever valves have been removed for inspection, reconditioning or replacement, valve springs should be tested.

As An Example - the compression length of the spring to be tested is 33.34 mm (1.313 inch). Turn table of Tool C-647, or equivalent until surface is in line with the 33.34 mm (1.313 inch) 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 specifications below to obtain specified height and allowable tensions. Discard the springs that do not meet specifications.

Free Length: 46 mm (1.811 inch)
Valve Closed: 246 - 270 Nm/38.0 mm (55 - 60 lbs./1.496 inch)
Valve Open: 549 - 611 Nm/29.3 mm (123 - 137 lbs./1.153 inch)

2. Inspect each valve spring for squareness with a steel square and surface plate, test springs from both ends. If the spring is more than 1.5 mm (0.06 inch) out of square, install a new spring.