Valve Springs

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.

Check each valve spring for damage or deformation. Also measure free length and outer diameter.
Inspection standard : Refer to " CONTROL VALVES ".
Replace valve springs if deformed or fatigued.

Fig 1: Identifying Outer Diameter And Free Length Of Valve Spring
Courtesy of NISSAN MOTOR CO., U.S.A.