Valve, Valve Guide Inspection

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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
1. IN: 5.975-5.995 mm {0.2352-0.2360 in}
2. EX:5.950-5.970 mm {0.2343-0.2350 in}
  
  Fig 1: Measuring Valve Stem Diameter
  Courtesy of MAZDA MOTORS CORP.
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.

Fig 2: Measuring Valve Guide Inner Diameter
Courtesy of MAZDA MOTORS CORP.
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
1. IN: 0.020-0.069 mm {0.0008-0.0027 in}
2. EX: 0.045-0.094 mm {0.0018-0.0037 in}
  
  Fig 3: Identifying Valve Stem To Guide Clearance
  Courtesy of MAZDA MOTORS CORP.