Valve Spring: Squareness

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

Measure dimension "S".
Out-of-square "S":

Less than 2.0 mm (0.079 in)
If it exceeds the limit, replace spring.

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