ISUZU Amigo/Pick-ups/Rodeo/Trooper 1981-1996

Valve Springs

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REMOVAL & INSTALLATION



See Figures 1, 2, 3, 4, 5, 6, 7, 8 and 9



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Fig. Fig. 1: Leverage type valve spring compressor tool-2.8L and 3.1L engines



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Fig. Fig. 2: Leverage type compressor for the 2.2L diesel engine



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Fig. Fig. 3: On most engines a C-clamp type spring may be used if the cylinder head is removed from the engine



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Fig. Fig. 4: Be careful not to lose the valve keepers



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Fig. Fig. 5: The first step toward valve spring service is to remove the rocker arm cover-2.8L engine shown



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Fig. Fig. 6: Removing the rocker nut-2.8L engine shown



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Fig. Fig. 7: Removing the rocker arm pivot; the pivot must remain with the rocker arm-2.8L engine shown



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Fig. Fig. 8: The rocker arm and its pivot must return the same valve. Tie them together with string or a twist tie to keep them together-2.8L engine shown



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Fig. Fig. 9: Compressed air must be used to keep the valves from falling into the cylinder before removing the spring-2.8L engine shown

Removal or installation of the valve springs requires use a valve spring compressor. There are several designs, like the leverage type, jawed type or C-clamp type. The C-clamp type is the most common for cylinder head service where the heads have been removed. All of the other types that are used with the cylinder heads installed require the use of compressed air to keep the valves from falling down inside the cylinder. A GM type Air Adapter tool No. J-23590 or equivalent can be used to retain the valves if the cylinder head using compressed air.

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.

INSPECTION



See Figures 10, 11, 12 and 13



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Fig. Fig. 10: A caliper gauge may be used to check the valve spring free-length



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Fig. Fig. 11: Check the valve spring for squareness on a flat surface, a carpenters square can be used



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Fig. Fig. 12: The valve spring should be straight up and down when placed like this



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Fig. Fig. 13: If a spring pressure testing tool is not available, have the spring checked professionally

  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/or compressed heights is checked, depending on the specification.

 
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