Valve Spring

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.

Measure free length and outer diameter of each valve spring. Also check for damage or deformation.
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.