REMOVAL & INSTALLATION
Valve spring removal and installation is part of the Valves removal and installation procedure covered in this section.
Place the spring on a flat surface next to a square. Measure the height of the spring, and rotate it against the edge of the square to measure distortion. If spring height varies (by comparison) by more than 1 / 16 in. (1.6mm) or if distortion exceeds 1 / 16 in. (1.6mm) replace the spring. In addition to evaluating the spring as above, test the spring pressure at the installed and compressed (installed height minus valve lift) height using a valve spring tester.
VALVE SPRING INSTALLED HEIGHT
Measure the distance between the spring pad and the lower edge of the spring retainer, and compare to specifications. If the installed height is incorrect, add shim washers between the spring pad and the spring. Be sure only to use shims designed for this purpose