Valve Springs

WARNING: This page is about a different car, the 2004 Nissan Sentra. 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.
1. Inspection standard: Refer to "CONTROL VALVE AND PLUG RETURN SPRINGS ".
Replace valve springs if deformed or fatigued.

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