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.
See Figures 5, 6, 7 and 8
- 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. (2mm) or if the distortion exceeds 1 / 16 in. (2mm), 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/or compressed height is checked, depending on the specification.