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Valve Spring Testing

The valve springs should be tested whenever removed for inspection, reconditioning, or replacement (Fig 1).

Fig 1: Testing Valve Spring With Special Tool C-647
G02681978Courtesy of DAIMLERCHRYSLER CORP.
  1. Obtain specifications for spring tension at specified spring length (Refer to SPECIFICATIONS ).
  2. Turn table of Special Tool C-647 until the surface is in line with the spring length specification mark on the threaded stud and the zero mark is on the front.
  3. Place spring over stud on the table and lift compressing lever to set tone device.
  4. Pull on torque wrench (beam or dial type) 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.
  5. Compare reading to the specification. Discard the springs that do not meet specifications.
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