VALVE SPRING INSPECTION

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Caution

• The valve springs differ depending on the IN and EX sides. Therefore, verify the free length or identification paint beforehand and inspect the valve springs.

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1. Measure the valve spring height using the spring tester.

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• If it is not within the specification, replace the valve spring.

Valve spring installation height

IN: When pressurized with spring force of 128.3—141.7 N {13.09—14.44 kgf, 28.85—31.85 lbf}, spring height is 35.0 mm {1.38 in}

EX (TYPE A): When pressurized with spring force of 137.8—152.2 N {14.06—15.52 kgf, 30.98—34.21 lbf}, spring height is 35.0 mm {1.38 in}

EX (TYPE B): When pressurized with spring force of 209—231 N {21.4—23.5 kgf, 47.0—51.9 lbf}, spring height is 35.0 mm {1.38 in}

2. Measure the amount of off-square on the valve spring using a square.

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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 maximum specification, replace the valve spring.

Maximum valve spring off-square

IN: 2.0 ° (1.5 mm {0.059 in})

EX (TYPE A): 2.0 ° (1.7 mm {0.067 in})

EX (TYPE B): 2.0 ° (1.9 mm {0.075 in})