Caravan FWD L4-2.4L VIN X (1997)
Valve Spring: Service and Repair
Inspection
1. Whenever valves have been removed for inspection, reconditioning or replacement, valve springs should be tested. As an example, the compression
length of the spring to be tested is 33.34 mm (15/16 inches). Turn tool table until surface is in line with the 33.34 mm (15/16 inch) mark on the
threaded stud and the zero mark on the front. Place spring over stud on the table and lift compressing lever to set tone device. Pull on torque wrench
until ping is heard. Take reading on torque wrench at this instant. Multiply this reading by two. This will give the spring load at test length. Fractional
measurements are indicated on the table for finer adjustments. Discard the springs that do not meet specifications. The Following specifications
apply to both intake and exhaust valve springs:
^ Valve Closed Nominal Tension - 76 ft. lbs. @ 38.0 mm (1.50 inch)
^ Valve Open Nominal Tension - 136 ft. lbs. @ 29.75 mm (1.17 inch)
2. Inspect each valve spring for squareness with a steel square and surface plate, test springs from both ends. If the spring is more than 1.5 mm (1/16
inch) out of square, install a new spring.
