Valve Spring

Check the valve springs for damage, free length, and tension. Replace the valve spring if it is not within the standard value presented in the table.

To measure the squareness of the valve spring, stand the valve spring on a surface plate and measure its deflection at the top of the spring using a try square.

VALVE SPRING REFERENCE CHART

Free length	mm (in)	55.2 (2.173)
Tension/spring height N (kgf, lbf)/mm (in)	Set	235.3 - 270.7 (24 - 27.6, 52.9 - 60.8)/45.0 (1.772)
Tension/spring height N (kgf, lbf)/mm (in)	Lift	578.9 - 639.9 (59.1 - 65.3, 130.3 - 143.9)/34.7 (1.366)
Squareness		2.5°, 2.4 mm (0.094 in) or less

Fig 1: Measuring Squareness Of Valve Spring

Courtesy of SUBARU OF AMERICA, INC.