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

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

Valve spring installation height

28.68 mm {1.129 in} (390 N {39.8 kgf, 87.7 lbf})

2.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.

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• If it exceeds the specification, replace the valve spring.

Maximum valve spring off-square

3.41 mm {0.134} (2°)