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VALVE, VALVE GUIDE INSPECTION

A6E242412111E01

1. Measure the valve head margin thickness of each valve.

  • If not specified, replace the valve.

  Margin thickness:
  IN: 1.62 mm {0.0637 in}
  EX: 1.82 mm {0.0716 in}

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

  • If not specified, replace the valve.

  Standard length L:
  IN: 102.99-103.79 mm {4.055-4.086 in}
  EX: 104.25-105.05 mm {4.105-4.135 in}
  Minimum length L:
  IN: 102.99 mm {4.055 in}
  EX: 103.79 mm {4.086 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 not as specified, replace the valve.

  Standard diameter:
  IN: 5.470-5.485 mm {0.2154-0.2159 in}
  EX: 5.465-5.480 mm {0.2152-0.2157 in}
  Maximum diameter:
  IN: 5.440 mm {0.2142 in}
  EX: 5.435 mm {0.2140 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.

  Standard Inner diameter:
  IN: 5.509-5.539 mm {0.2169-0.2180 in}
  EX: 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.

  • If not as specified, replace the valve and/or the valve guide.

  Standard clearance:
  IN: 0.024-0.069 mm {0.0009-0.0027 in}
  EX: 0.029-0.074 mm {0.0012-0.0029 in}
  Maximum clearance:
  0.10 mm {0.004 in}

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

  • If not as specified, replace the valve guide.

  Standard diameter:
  IN: 12.2-12.8 mm {0.481-0.503 in}
  EX: 12.2-12.8 mm {0.481-0.503 in}