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Crankshaft installation

A crankshaft in a marine diesel engine is a critical component that converts the reciprocating motion of the pistons into the rotational motion needed to power the propeller. It does this by using connecting rods to transfer the up-and-down force from the pistons to the crankshaft, which then spins to produce torque. These crankshafts are subjected to high loads and are typically made from high-strength, alloyed steel for durability.


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Reasons for Failure and Misalignment of Crankshaft in Marine ...
A crankshaft in a marine diesel engine is a critical component that converts the reciprocating motion of the pistons into the rotational motion needed to power the propeller. It does this by using connecting rods to transfer the up-and-down force from the pistons to the crankshaft, which then spins to produce torque. These crankshafts are subjected to high loads and are typically made from high-strength, alloyed steel for durability.

Function and operation

Motion conversion: The primary function is to convert the linear, up-and-down (reciprocating) movement of the pistons into a continuous rotational force.

Power transmission: This rotational motion is then transmitted, usually through a series of gears, to the propeller shaft, which moves the ship.

Torque and thrust: The crankshaft's rotational force (torque) is what ultimately generates the thrust that propels the vessel through the water.

Construction and materials

Components: A crankshaft includes main journals, crank webs, and crank pins, which are the points where the connecting rods attach.

Materials: Marine crankshafts are typically made from high-strength, alloyed steel to withstand the high pressures and torque they endure.

Durability: Key areas like the bearing surfaces are hardened to prevent wear and ensure a long service life under extreme conditions.

Importance

The crankshaft is one of the most critical parts of the engine due to the extreme and cyclic loads it handles from combustion, piston movement, and propeller drag.
Its design and material are crucial for the engine's reliability, performance, and longevity.

Keen knowledge of crankshaft is crucial for a marine engineer ( MEO class IV, MEO class II, MEO class I ).

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