Valve Spring Inspection

Apply pressing force to the pressure spring and inspect for the spring height. Replace the valve spring as necessary.
Pressing Force

177.1-200.1 N {18.05-20.40 kgf, 39.71-44.88 lbf}

Standard Height

36.5 mm {1.44 in}

Fig 1: Measuring Pressing Force
Courtesy of MAZDA MOTORS CORP.
Measure the out-of-square of the valve spring. Replace the valve spring as necessary.
Maximum Valve Spring Out-Of-Square

1.54 mm {0.061 in}

Fig 2: Measuring Valve Spring Out-Of-Square
Courtesy of MAZDA MOTORS CORP.