OPERATING MECHANISMS FOR A 4-STROKE CYCLE, DIESEL
ENGINE
7-24. The operating mechanisms discussed so far have applied to 2-stroke cycle diesel engines. We now will
take a look at the operating mechanisms of a 4-stroke cycle diesel engine. They are similar except for some
minor differences in design and arrangement and the reduced operating speed of the camshaft. The drive has
no provision for driving a blower, since 4-stroke cycle diesel engines are either naturally aspirated or are
turbocharged. Turbocharging units are exhaust driven and require no mechanical drive. The valve actuating
gear operates valves for both intake and exhaust. The arrangement of the operating mechanism is shown in
Figure 7-8.