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Home >> Ford >> 2005 >> Freestar Base >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine System-General Information >> General Procedures >> Cylinder Head Distortion >> Checking Distortion

Checking Distortion

    NOTE: Make sure all cylinder head surfaces are clear of any gasket material, RTV, oil and coolant. The cylinder head surface must be clean and dry before running a flatness check.
    NOTE: Use a straight edge that is calibrated by the manufacturer to be flat with 0.005 mm (0.0002 in) per running foot length. For example, if the straight edge is 61 cm (24 in) long, the machined edge must be flat with 0.010 mm (0.0004 in) from end to end.
    Fig 1: Inspecting Cylinder Head For Flatness
    G03933329Courtesy of FORD MOTOR CO.
  1. Using a straight edge and a feeler gauge, inspect the cylinder head for flatness in the sequence shown. If the cylinder head is distorted, install a new cylinder head.
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