VALVE, VALVE GUIDE INSPECTIONSM1759374
VALVE, VALVE GUIDE INSPECTION

E6U011010280E01

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

• If it is less than the minimum specification, replace the valve.
C3U0110E051
Minimum valve head margin thickness
IN: 1.62 mm {0.0637 in}
EX: 1.82 mm {0.0716 in}

2.Measure the length of the each valve using a vernier caliper.

• If it is not within the specification, replace the valve.
B3E0110E0682
Standard valve length (Dimension L)
IN: 102.99-103.79 mm {4.055-4.086 in}
EX: 104.25-105.05 mm {4.105-4.135 in}

3.Measure the 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.

• If it is less than the minimum specification, replace the valve.
ADJ2224E0243
Valve stem diameter
Standard
IN: 5.970-5.985 mm {0.2351-0.2356 in}
EX: 5.965-5.980 mm {0.2349-0.2354 in}
Minimum
IN: 5.940 mm {0.2339 in}
EX: 5.935 mm {0.2336 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.

• If it is not within the specification, replace the valve guide.
ADJ2224E0264
Standard valve guide inner diameter
IN: 6.009-6.039 mm {0.2366-0.2377 in}
EX: 6.009-6.039 mm {0.2366-0.2377 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.

• If it exceeds the maximum specification, replace the valve or valve guide.
ADA2224E0275
Clearance between valve stem and guide
Standard
IN: 0.024-0.069 mm {0.0009-0.0027 in}
EX: 0.029-0.074 mm {0.0012-0.0029 in}
Maximum
0.10 mm {0.004 in}

6.Measure the projection height (dimension A) of each valve guide using the vernier caliper.

• If it is not within the specification, replace the valve guide.
C3U0110E0046
Standard valve guide projection height
IN: 12.2-12.8 mm {0.481-0.503 in}
EX: 12.2-12.8 mm {0.481-0.503 in}