Crankshaft & Camshaft [Video Lesson]


The working of other components of the engine, such as the camshaft for fuel timing, the firing order of units, etc; depends upon the correct rotation of the crankshaft Failure of the crankshaft can stall the engine /ship.


The material for construction: Slow-speed marine diesel engines have crankshafts forged of plain carbon steel (0.2 to 0.4% of carbon) but the medium and high-speed engines use Alloy Steel. The crankshafts on the large modern 2-stroke crosshead engines can weigh over 300 tons.


]They are too big to make as a single unit and so are constructed by joining together individual forgings. Crankshaft manufacture is a complex and elaborate process and the exact procedure would vary with the type and size of the crankshaft. Semi built Crankshaft                     Fully built Crankshaft



In a 2-stroke marine engine, the camshaft is responsible for activating the engine’s valves and other mechanical components. The camshaft typically has lobes that open and close the exhaust and intake valves, as well as lobes that activate the fuel injection system and other mechanical components.


The camshaft is driven by the engine’s crankshaft, and the timing of the camshaft is critical to the proper operation of the engine. If the camshaft is not properly timed, the engine may not run correctly or may not run at all.


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