1996 Ford F250 Owner's Manual - Page 309

Cleaning the Engine A clean engine is more efficient because a buildup of grease and dirt acts as an insulator, keeping the engine warmer than usual. u Extreme care must be used if a power washer is used to clean the engine. The high pressure fluid could penetrate sealed parts and assemblies causing damage or malfunctions. engine block or fuel injection pump, do not spray a hot engine or injection pump with cold water. be covered. Covering these components will help prevent water damage. running. Water getting into the engine may cause internal damage. u In order to avoid possible cracking of the u The alternator, distributor and air intake must u Never wash or rinse the engine while it is Filling the Fuel Tank Fuel filler door 310