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.

At installed height: 35.0 mm (1.38 inch)
Standard 196 N (44 lb.)
Limit Less than 181 N (41 lbs.)