GM Buick/Oldsmobile/Pontiac/Full-Size 1975-1990 Repair Guide

Valve Springs

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REMOVAL & INSTALLATION



Valve spring removal and installation is part of the Valves removal and installation procedure covered in this section.

INSPECTION



See Figures 1, 2, 3 and 4

  1. Place the valve spring on a flat, clean surface next to a square.
  2.  
  3. 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.
  4.  

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.



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Fig. Fig. 1: Be sure the closed coil end is facing downward when checking squareness



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Fig. Fig. 2: A caliper gauge can be used to check valve spring free-length



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Fig. Fig. 3: A carpenters square can be used to check free-length and squareness



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Fig. Fig. 4: The valve spring should not be more than 1/16in. (1.6 mm) out of square

 
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