CIGúEÑAL 1 PART YAMAHA 69P-11412-00

Function and technical context

The crankshaft is the fundamental component of the energy conversion system in Yamaha engines, transforming the reciprocating movement of the pistons into continuous rotation that transmits power to the propeller shaft. It operates inside the engine block, housed in the main bearings, and supports the combustion forces and vibrations generated during engine operation. A worn or damaged crankshaft causes progressive loss of compression, excessive vibration, increased fuel consumption and, in critical cases, cascading damage to other internal components such as connecting rods and pistons.

When to replace this part?

The crankshaft requires inspection during every seasonal maintenance, especially in saltwater engines where corrosion accelerates wear. Symptoms of failure include abnormal vibrations at idle or acceleration, metallic noises coming from the crankcase, unexplained loss of power, or excessive movement of the drive shaft when the engine is stopped. Preventive replacement of the crankshaft is essential after more than 1500-2000 hours of intensive operation or if friction marks, deformation or cracks are detected in visual inspection; Postponing this repair in open water can lead to costly breakdowns and risky situations.

Equivalent manufacturer part numbers