While generally water won't do too much harm to an engine in small amounts, it is a good idea to shield the alternator and ignition components with aluminum foil before spraying down the engine. I use Simple Green on a cold motor (or a quality aerosol engine degreaser in extremes on a warm powerplant) and let it soak for a minute before rinsing.phamous101 said:man..... just hit it with a garden hose. it aint gonna do anything to it but clean off any loose dirty and leaves. i do it all the time when i change the oil. it does have a distributor and the coil packs will work fine when wet.
This is only partially true, dealerships and many professionals use a 3-step system to clean/detail the engine bay. First the engine is sprayed with engine degreaser followed by a pressure washing (which dispenses only a small amount of water compared to the garden hose), finally the engine is finished with steam cleaning which loosens up any residual chemical/dirt which ultimately evaporates.lexRacer said:IT is perfectly safe ...... the dealership cleans ur engine bay with a medium powerd hose to clean ur engine bay when u take ur car in for service