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Valve Spring

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  1. 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.
  2. 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 valve spring using a try square.
Free length mm (in) 53.48 (2.106)
Tension/spring height
N (kgf, lbf)/mm (in)
Set 204.6 - 235.4 (20.86 - 24.00, 46.00 - 52.93)/36.0 (1.417)
Lift 363.5 - 401.7 (37.07 - 40.96, 81.73 - 90.32)/26.7 (1.051)
Squareness 2.5°, 2.3 mm (0.091 in) or less
Fig 1: Measuring Valve Spring Squareness
G04997718Courtesy of SUBARU OF AMERICA, INC.