Valve Spring

WARNING: This page is about a different car, the 2006 Subaru Outback. However, it is still accessible from the selected car via links, so may be relevant.

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.

VALVE SPRING SPECIFICATION

Free length	mm (in)	Intake	Inner	39.55 (1.5571)
			Outer	41.18 (1.6213)
		Exhaust		46.32 (1.8236)
Squareness		Intake	Inner	2.5°, 1.7 mm (0.067 in)
			Outer	2.5°, 1.8 mm (0.071 in)
		Exhaust		2.5°, 2.0 mm (0.079 in)

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

Fig 1: Measuring Squareness Of Valve Spring