VALVE, VALVE GUIDE INSPECTION [MZR-CD 2.2]
id0110f2506200
1. Measure the valve head margin thickness of each valve.
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• If it is less than the minimum specification, replace the valve.
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Minimum valve head margin thickness
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IN: 0.8 mm {0.0315 in}
EX: 1.0 mm {0.0394 in}
2. Measure the length of each valve.
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• If it is less than the minimum specification, replace the valve.
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Standard valve length (Dimension L)
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IN : 91.44—91.94 mm {3.601—3.619 in}
EX : 90.90—91.40 mm {3.579—3.598 in}
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Minimum valve length (Dimension L)
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IN : 91.215 mm {3.5911 in}
EX : 90.675 mm {3.5699 in}
3. Measure the stem diameter of each valve in 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 : 5.970—5.985 mm {0.2351—0.2356 in}
EX : 5.965—5.980 mm {0.2349—0.2354 in}
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Minimum valve stem diameter
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IN : 5.920 mm {0.2331 in}
EX : 5.915 mm {0.2329 in}
4. Measure the inner diameter of each valve guide in X and Y directions at the three points (A, B, and C) shown in the figure.
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• If it is not within the specification, replace the valve guide.
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Standard valve guide inner diameter
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6.030—6.050 mm {0.2375—0.2381 in}
5. Measure the protrusion height (dimension A) of each valve guide without lower valve spring seat.
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• If it is not within the specification, replace the valve guide.
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Standard valve guide protrusion height (Dimension A)
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12.6—13.1 mm {0.497—0.515 in}
