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Home >> Mazda >> 2017 >> CX-5 Touring, AWD >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - Overhaul - SKYACTIV-G - 2.5L >> Cylinder Head Inspection

Cylinder Head Inspection

  1. Inspect the cylinder head surface for cracks and other damage using a red dye penetrant.
    • If there is a malfunction, replace the cylinder head.
  2. Measure the combustion chamber side of the cylinder head for distortion in six directions as shown in the figure using a straight edge and feeler gauge.
    • If the distortion exceeds the maximum specification, replace the cylinder head. Do not attempt to repair the cylinder head by milling or grinding.

    Maximum distortion, head gasket side of the cylinder head 0.05 mm {0.002 in} 

    Fig 1: Measuring Combustion Chamber Side Of Cylinder Head For Distortion
    G09757205Courtesy of MAZDA MOTORS CORP.
  3. Inspect the contact surface of the exhaust manifold and the intake manifold for distortion by measuring as shown in the figure using a straight edge and feeler gauge.
    • If the distortion on the intake manifold side exceeds the maximum specification, replace the cylinder head.
    • If the distortion on the exhaust manifold side exceeds the maximum specification, grind the surface or replace the cylinder head.

    Maximum distortion, manifold side 

    IN: 0.10 mm {0.0039 in} 

    EX: 0.05 mm {0.002 in} 

    Maximum cutting length, manifold side 

    IN: Cutting not authorized 

    EX: 0.20 mm {0.0079 in} 

    Fig 2: Inspecting Contact Surface Of Exhaust Manifold And Intake Manifold For Distortion
    G09757206Courtesy of MAZDA MOTORS CORP.
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