Trooper LS V6-3.5L (1998)
Limit: 2 mm (0.0787 inch)
3. 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.
At installed height: 35.0 mm (1.38 inch)
Standard: 196 N (44 lb.)
Limit: Less than 181 N (41 lbs.)
Valve Guide
CAUTION: Take care not to damage the valve seat contact surface, when removing carbon adhering to the valve head. Carefully inspect the valve
stem for scratches or abnormal wear. If these conditions are present, the valve and the valve guide must be replaced as a set.
1. Measure the valve stem diameter with a micrometer.
If the valve stem diameter is less than the specified limit, the valve and the valve guide must be replaced as a set.
Diameter of Valve Stem:
Intake Standard: 5.977 mm - 5.959 mm (0.2353 inch - 0.2346 inch)
Limit: 5.90 mm (0.2323 inch)
Exhaust Standard: 5.952 mm - 5.970 mm (0.2343 inch - 0.2350 inch)
Limit: 5.90 mm (0.2323 inch)
2. Measure the inside diameter of the valve guide with a micrometer. Subtract the measured outer diameter of the valve stem from the measured inner
diameter of the valve guide. If the value exceeds the specified limit, the valve and the valve guide must be replaced as a set.
Inside Diameter of the Valve Guide:
Inlet clearance Standard: 0.023 mm - 0.056 mm (0.0009 inch - 0.O002 inch)
Limit: 0.20 mm (0.00787 inch)
Exhaust clearance Standard: 0.030 mm - 0.063 mm (0.0012 inch - 0.0025 inch)
Limit: 0.20 mm (0.00787 inch)
Valve Guide Replacement
