Shows internal structure and operating principles of a full-sized water cooled 4-stroke diesel engine. Camshaft, rock-arms, and tappets are clearly demonstrated. Also, the functioning of the fuel injection system is represented. Model includes cross sections of carburetor and fuel supply. A simulated spark plug (lamp) indicates the firing point. Lamp requires a 6- to 12-V power source (not included). Dimensions: model, 12 x 9 x 5"; base, 8 x 8 x 2-1/2". No assembly required.