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Cylinder Head Distortion

WARNING: This page is about a different car, the 2003 Nissan Altima. However, it is still accessible from the selected car via links, so may be relevant.
  1. Wipe off oil and remove water scale deposits, old gasket, old sealer, and carbon with a scraper.
    CAUTION: Use care not to allow gasket debris to enter passages for oil or water.
  2. At each of several locations on bottom surface of cylinder head, measure distortion in six directions.
    1. Standard :0.1 mm (0.004 in) or less 
    Fig 1: Checking For Warpage
    G02110386Courtesy of NISSAN MOTOR CO., U.S.A.
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