Valve Spring Inspection

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Apply pressing force to the pressure spring and inspect the spring height.
- If it is less than the specification, replace the valve spring.
Pressing Force
1. 390 N {39.76 kgf, 87.67 lbf}
Standard Height
1. 28.68 mm {1.129 in}
  
  Fig 1: Inspecting Spring Height Under Pressing Force
  Courtesy of MAZDA MOTORS CORP.
Measure the out-of-square of the valve spring, using a square, as shown in the figure.
1. Rotate the valve spring one full turn and measure "A" at the point where the gap is the largest.
  - If it exceeds the specification, replace the valve spring.
Valve Spring Maximum Out-Of-Square
1. 1% (2.23 mm {0.0877 in})
  
  Fig 2: Measuring Valve Spring Out-Of-Square
  Courtesy of MAZDA MOTORS CORP.