GM S10/S15/Sonoma Pick-Ups 1982-1993 Repair Manual

Valve Springs

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REMOVAL & INSTALLATION



See Figures 1, 2, 3 and 4

Removal or installation of the valve springs requires use of the following tools:



Valve Spring Compressor tool (leverage type) No. J-5892-C or equivalent (2.0L, 2.5L, 2.8L and 4.3L engines)
 
Valve Spring Compressor tool (jawed type) No. J-26513 or equivalent (1.9L engine)
 
Valve Spring Compressor tool (leverage type) No. J-29760 or equivalent (2.2L diesel engine)
 
GM Air Adapter tool No. J-23590 or equivalent to retain the valves if the cylinder head is to remain installed
 

The valve springs are removed and installed as part of the valve procedure found earlier in this section. If only a spring replacement is required, refer to the valve stem seal procedure with the cylinder head installed. The same air pressure method may be used to retain the valve while only a spring is replaced.



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Fig. Fig. 1: Leverage type valve spring compressor tool-2.0L, 2.5L, 2.8L and 4.3L engines



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Fig. Fig. 2: Jawed type valve spring compressor-1.9L engine



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Fig. Fig. 3: Leverage type compressor for the 2.2L diesel engine



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Fig. Fig. 4: On most engines a C-clamp type spring may be used if the cylinder head is removed from the engine

INSPECTION



See Figures 5, 6, 7 and 8

  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. or if the distortion exceeds 1 / 16 in., 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/or compressed heights is checked, depending on the specification.



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Fig. Fig. 5: A caliper gauge may be used to check the valve spring free-length



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Fig. Fig. 6: Check the valve spring for squareness on a flat surface, a carpenters square can be used



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Fig. Fig. 7: The valve spring should be straight up and down when placed like this



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Fig. Fig. 8: If a spring pressure testing tool is not available, have the spring checked professionally

 
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