Valve Spring: Testing and Inspection

VALVE SPRING INSPECTION





1. Apply pressing force to the pressure spring and inspect the spring height.
- If it is less than the specification, replace the valve spring.
Pressing force 390 N {39.76 kgf, 87.67 ft. lbs.}
Standard height 28.68 mm {1.129 inch}
2. Measure the out-of-square of the valve spring, using a square, as shown in the figure.





1 Rotate the valve spring one full turn and measure "A" at the point where the gap is the largest.
- If it exceeds the specification, replace the valve spring.
Valve spring maximum out-of-square 1% (2.23 mm {0.0877 inch})