Cylinder Head Distortion

WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

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 straightedge that is calibrated by the manufacturer to be flat with 0.005 mm (0.0002 in) per running foot length. For example, if the straightedge 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 Flatness In Sequence Using Special Tool

Courtesy of FORD MOTOR CO.

Using a straightedge 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.