Valve - Spring Squareness

WARNING: This page is about a different car, the 2003 Mazda Tribute and 2002 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.

Measure the out-of-square on each valve spring.
1. Turn the valve spring and observe the space between the top of the valve spring and the square. Install a new valve spring if out of square.
  
  Fig 1: Measuring Valve Spring Out-Of-Square
  Courtesy of MAZDA MOTORS CORP.