VALVE INSPECTION [WLT-1, WLT-2, WL-3]
id011097501000
1. Measure the valve head margin thickness of each valve.
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• If it exceeds the standard specification, replace the valve.
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Standard valve margin thickness
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IN: 1.5 mm {0.059 in}
EX: 0.75 mm {0.030 in}
2. Measure the length of each valve. Replace the valve if necessary.
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• If it is less than the minimum specification, replace the valve.
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Standard valve length
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IN: 111.6—112.1 mm {4.394—4.413 in}
EX: 111.5—112.0 mm {4.390—4.409 in}
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Minimum valve length
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IN: 111.35 mm {4.384 in}
EX: 111.25 mm {4.380 in}
3. Measure the stem diameter of each valve in the X and Y directions at the three points (A, B, and C) shown in the figure.
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• If it is less than the minimum specification, replace the valve.
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Standard valve stem diameter
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IN: 6.970—6.985 mm {0.2745—0.2749 in}
EX: 6.965—6.980 mm {0.2743—0.2748 in}
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Minimum valve stem diameter
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IN: 6.920 mm {0.2724 in}
EX: 6.915 mm {0.2722 in}
