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1.Measure the valve head margin thickness using a vernier caliper.

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

Minimum valve head margin thickness

IN: 1.65 mm {0.0650 in}

EX: 1.85 mm {0.0728 in}

2.Measure the length of each valve. Replace the valve if necessary.

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

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Standard valve length (Dimension L)

IN: 102.99—103.79 mm {4.0548—4.0862 in}

EX: 104.25—105.05 mm {4.1044—4.1358 in}

Minimum valve length (Dimension L)

IN: 102.99 mm {4.0548 in}

EX: 104.25 mm {4.1044 in}

3.Measure the stem diameter of each valve in X and Y directions at the three points (A, B, and C) as indicated in the figure.

• If it exceeds the specification, replace the valve.

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Standard valve stem diameter

IN: 5.470—5.485 mm {0.2154—0.2159 in}

EX: 5.465—5.480 mm {0.2152—0.2157 in}

Minimum valve stem diameter

IN: 5.470 mm {0.2154 in}

EX: 5.465 mm {0.2152 in}

4.Measure the inner diameter of each valve guide in X and Y directions at the three points (A, B, and C) as indicated in the figure.

• If not as specified, replace the valve guide.

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Standard valve guide inner diameter

5.509—5.539 mm {0.2169—0.2180 in}

5.Calculate the valve stem to guide clearance by subtracting the outer diameter of the valve stem from the inner diameter of the corresponding valve guide.

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• If it exceeds the specification, replace the valve and/or the valve guide.

Standard clearance between valve stem and guide

IN: 0.024—0.069 mm {0.0010—0.0027 in}

EX: 0.029—0.074 mm {0.0012—0.0029 in}

Maximum clearance between valve stem and guide

0.10 mm {0.004 in}

6.Measure the protrusion height (dimension A) of each valve guide without lower valve spring seat using the vernier caliper.

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• If not within the specification, replace the valve guide.

Standard valve guide projection height

12.2—12.8 mm {0.481—0.503 in}