Cylinder Head Inspection

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Perform color contrast penetrate examination on the cylinder head surface.
- Replace the cylinder head if necessary.
Inspect for the following and repair or replace if necessary.
1. Sunken valve seats.
2. Excessive camshaft oil clearance and end play.
Measure the cylinder head for distortion in six directions as shown in the figure.
- If it exceeds the maximum specification, replace the cylinder head.
Maximum Distortion
- 0.10 mm {0.004 in}
Fig 1: Measuring Cylinder Head Distortion
Courtesy of MAZDA MOTORS CORP.
Measure the manifold contact surface distortion as shown in the figure.
- If it exceeds the maximum specification, grind the surface or replace the cylinder head.
Maximum Distortion
1. 0.10 mm {0.004 in}
Maximum Grinding
1. 0.15 mm {0.006 in}
  
  Fig 2: Measuring Manifold Contact Surface Distortion
  Courtesy of MAZDA MOTORS CORP.