Valve Spring Squareness

WARNING: This page is about a different car, the 2006 Nissan Titan. 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 the spring. Measure the maximum clearance between the top face of spring and try square.

Fig 1: Setting Try Square Along Side Of Valve Spring And Rotate Spring
Courtesy of NISSAN MOTOR CO., U.S.A.

Limit: Less than 2.2 mm (0.087 in)
If measurement is not within specifications, replace the valve spring.