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1.Apply pressing force to the pressure spring and inspect the spring height.

• If it is less than the specification, replace the valve spring.

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Valve spring standard height

Valve spring with pink paint mark: 30.2 mm {1.19 in} (pressing force 388.7 N {39.64 kgf, 87.38 lbf})

Except above: 28.68 mm {1.129 in} (pressing force 390 N {39.76 kgf, 87.67lbf})

2.Measure the out-of-square of the valve spring, using a square, as shown in the figure.

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(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.