Ford 4.2L Intake Manifold and Timing Cover Gaskets

Ford 4.2L truck and van engines manufactured from 1997 to 2001 have had problems with coolant leaking into the engine oil and into the cylinders. A failed intake manifold gasket or a failed timing cover gasket may cause the coolant to leak into the oil, but coolant leaking into the cylinders is almost always caused by failure of the intake manifold gasket. These problems have been widely reported in several service bulletins over the years.