VALVE, VALVE GUIDE INSPECTION

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  Note
  • Before inspecting the valve and valve guide, verify the marking on the valve and determine its type.

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

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

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  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.

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  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.

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  Valve stem diameter (MZR 2.0 DISI, MZR 2.0 DISI i-stop)

  Standard
  IN (other than LF marking) : 5.970—5.985 mm {0.2351—0.2356 in}
  IN (LF marking) : 5.470—5.485 mm {0.2154—0.2159 in}
  EX (other than YT marking) : 5.965—5.980 mm {0.2349—0.2354 in}
  EX (YT marking) : 5.465—5.480 mm {0.2152—0.2157 in}
  Minimum
  IN (other than LF marking) : 5.940 mm {0.2339 in}
  IN (LF marking) : 5.440 mm {0.2142 in}
  EX (other than YT marking) : 5.935 mm {0.2336 in}
  EX (YT marking) : 5.435 mm {0.2140 in}

  Valve stem diameter (MZR 2.3 DISI Turbo)

  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.

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  Standard valve guide inner diameter (MZR 2.0 DISI, MZR 2.0 DISI i-stop)

  IN (other than LF marking) : 6.009—6.039 mm {0.2366—0.2377 in}
  IN (LF marking) : 5.509—5.539 mm {0.2169—0.2181 in}
  EX (other than YT marking) : 6.009—6.039 mm {0.2366—0.2377 in}
  EX (YT marking) : 5.509—5.539 mm {0.2169—0.2181 in}

  Standard valve guide inner diameter (MZR 2.3 DISI Turbo)

  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.

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  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.

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  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}