LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2016 >> WRX Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Mechanical (WRX-STI)) >> Cylinder Head >> Inspection >> Valve Spring

Valve Spring

WARNING: This page is about a different variant/trim than selected.
  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.