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Home >> Chevrolet >> 2007 >> Optra5 LS, Standard >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical - 2.0L (L34 GMDAT) >> Repair Instructions >> Cylinder Head Cleaning and Inspection >> Inspection Procedure

Inspection Procedure

    Fig 1: Inspecting Cylinder Head
    GM1252185Courtesy of GENERAL MOTORS CORP.
  1. Make sure the gasket surfaces of the cylinder head and the engine block are free of nicks and heavy scratches.
  2. Inspect the cylinder head gasket and the mating surfaces for leaks, corrosion, and blow-by.
  3. Inspect the cylinder head for cracks.
  4. Inspect the length and the width of the cylinder head using a feeler gage and a straight edge.
  5. Check the sealing surfaces for deformation and warpage. The cylinder head sealing surfaces must be flat within 0.025 mm (0.001 in) maximum.
    6. Fig 2: Cylinder Head Height Measurement
    GM1252186Courtesy of GENERAL MOTORS CORP.
  6. Measure the height of the cylinder head from sealing surface to sealing surface. The cylinder head height should be 133.975-134.025 mm (5.274-5.276 in). If the cylinder head height is less than 133.9 mm (5.271 in), replace the cylinder.
  7. Inspect all threaded holes for damage.
  8. Inspect the valve seats for excessive wear and burned spots.
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