Trooper LS V6-3.5L (1998)
Valve Spring: Testing and Inspection
SPRING FREE HEIGHT
Measure the free height of the springs. The springs must be replaced if the free height is below the specified limit.
Standard ........................................................................................................................................................................................ 44.6 mm (1.7559 inch)
Limit ............................................................................................................................................................................................ 43.6 mm (1.7165 inch)
VALVE SPRING SQUARENESS
Measure the valve spring squareness with a steel square and replace the valve springs if the measured value exceeds the specified limit.
Limit ................................................................................................................................................................................................. 2 mm (0.0787 inch)
SPRING INSTALLED HEIGHT
Using a spring tester to compress the springs to the installed height, measure the compressed spring tension, and replace the springs if the measured
tension is below the specified limit.