I wash the engine every time I handwash Sherpa. I use a mild to moderately focused spray pattern that doesn't blast the engine. I usually start it either right after I rinse it or right before, and leave it running while I spray it off.

Don't wait too long between starting the engine and getting it wet... you don't want it to heat up so much that cold water might make it crack!

-Scott

1997 SR5 5-Spd. TRD Supercharger, URD Supercharger Performance Kit, "Bamachem Designed" 2.5" suspension lift, 265/75R16 Bridgestone Dueller Revos, Airbox Mod, Amsoil: (Air Filter plus engine, diff, x-fer case, + tranny oils)