Valve Spring

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Check the valve spring for damage and deformation.
Check the valve spring free length, tension and squareness. If it is not within the standard, replace the valve spring.
NOTE: To check the squareness of the valve spring, stand the valve spring on a surface plate and check its deflection at the top of the valve spring using a try square.

Fig 1: Checking Valve Spring Free Length, Tension And Squareness
Courtesy of SUBARU OF AMERICA, INC.

Free length:

Standard

41.06 mm (1.617 in)

Tension/spring height:

Set

Standard

182 - 210 N (18.56 - 21.41 kgf, 40.92 - 47.22 lbf)/33.0 mm (1.299 in)

Lift

Standard

552 - 610 N (56.29 - 62.20 kgf, 124.11 - 137.15 lbf)/22.0 mm (0.866 in)

Squareness:

Standard

2.5°, 1.8 mm (0.071 in) or less