REMOVAL & INSTALLATION
Valve spring removal and installation is part of the Valves removal and installation procedure covered in this section.
See Figures 1, 2, 3 and 4
- Place the valve spring on a flat, clean surface next to a square.
- Measure the height of the spring, and rotate it against the edge of the square to measure distortion (out-of-roundness). If spring height varies between springs by more than 1 / 16 in. (1.6mm) or if the distortion exceeds 1 / 16 in. (1.6mm), replace the spring.
A valve spring tester is needed to test spring test pressure, so the valve springs must usually be taken to a professional machine shop for this test. Spring pressure at the installed and compressed heights is checked, and a tolerance of plus or minus 5 lbs. (plus or minus 1 lb. on the 231 V6 is permissible on the springs covered in this guide.