Engine Spare Parts (crankshaft)

The crankshaft is one of the most critical components in a marine engine. It converts the reciprocating motion of the pistons (via the connecting rods) into rotational motion to turn the ship’s propeller.

📊 Key Features (as visible in your image):

• Main journals (the smooth cylindrical surfaces that run in the engine’s main bearings)

• Crankpins (offset journals where the connecting rods attach)

• Counterweights (to balance out the forces created by piston movement)

• Flange at the end for coupling to the flywheel or shaft

• Oil drillings (small internal oil passages visible as holes)

• Gear teeth section (used for driving other equipment like camshafts, oil pumps)

📌 Material:

Typically made from forged steel or cast steel alloy for:

• High fatigue strength

• Resistance to bending and torsional stresses

• Good wear resistance at journal surfaces

📌 Applications:

Used in low-speed two-stroke and medium/high-speed four-stroke marine diesel engines found on:

• Container ships

• Tankers

• Bulk carriers

• Offshore supply vessels