VALVE, VALVE GUIDE INSPECTION
VALVE, VALVE GUIDE INSPECTION
SM1665881
id011000506200
1.Measure the valve head margin thickness using a vernier caliper.
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• If it is less than the standard specification, replace the valve.
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Standard valve head margin thickness (Except MX-5 (ND) VIN serial No.300001-)
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IN: 1.75—1.95 mm {0.0689—0.0767 in}EX: 1.95—2.15 mm {0.0768—0.0846 in}
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Standard valve head margin thickness (MX-5 (ND) VIN serial No.300001-)
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IN: 1.75—1.95 mm {0.0689—0.0767 in}EX: 1.95—2.15 mm {0.0768—0.0846 in}
2.Measure the length of the each valve using a vernier caliper.
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• If it is less than the minimum specification, replace the valve.
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Standard valve length (Except MX-5 (ND) VIN serial No.300001-)
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IN: 106.55—107.15 mm {4.1949—4.2185 in}EX: 116.55—117.15 mm {4.5886—4.6122 in}
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Standard valve length (MX-5 (ND) VIN serial No.300001-)
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IN: 107.15—107.75 mm {4.2186—4.2421 in}EX: 117.15—117.75 mm {4.6123—4.6358 in}
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Minimum valve length (Except MX-5 (ND) VIN serial No.300001-)
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IN: 106.33 mm {4.1862 in}EX: 116.33 mm {4.5799 in}
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Minimum valve length (MX-5 (ND) VIN serial No.300001-)
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IN: 106.93 mm {4.2098 in}EX: 116.93 mm {4.6035 in}
3.Measure the valve stem diameter of each valve using the micrometer. Measurement positions total six and are in the X and Y directions, at three points (A, B, and C) as 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: 5.470—5.485 mm {0.2154—0.2159 in}EX: 5.465—5.480 mm {0.2152—0.2157 in}
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Minimum valve stem diameter
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IN: 5.424 mm {0.2135 in}EX: 5.419 mm {0.2133 in}
4.Measure the inner diameter of each valve guide using the caliper gauge. Measurement positions total six and are in the X and Y directions, at three points (A, B, and C) as 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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IN: 5.510—5.530 mm {0.2170—0.2177 in}EX: 5.510—5.530 mm {0.2170—0.2177 in}
5.Calculate the clearance between the valve stem and the valve guide by subtracting the inner diameter of the valve guide from the outer diameter of the corresponding valve stem.
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• If it exceeds the maximum specification, replace the valve or valve guide.
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Standard clearance between valve stem and guide
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IN: 0.025—0.060 mm {0.0010—0.0023 in}EX: 0.030—0.065 mm {0.0012—0.0025 in}
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Maximum clearance between valve stem and guide
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0.10 mm {0.0039 in}
6.Measure the projection height (dimension A) of each valve guide using the vernier caliper.
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• If it is not within the specification, replace the valve guide.
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Standard valve guide projection height
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IN: 16.4—17.0 mm {0.646—0.669 in}EX: 16.4—17.0 mm {0.646—0.669 in}