Valve Spring Squareness

WARNING: This page is about a different car, the 2005 Nissan 350Z. However, it is still accessible from the selected car via links, so may be relevant.

Set try square along the side of valve spring and rotate spring. Measure the maximum clearance between the top face of spring and try square.
- Limit: 2.1 mm (0.083 in)
If it exceeds the limit, replace valve spring.

Fig 1: Measuring Valve Spring Squareness
Courtesy of NISSAN MOTOR CO., U.S.A.