PIN 90250-05036 REC90250-05036

Function and technical context

This pin is a critical fastening component in the transmission and drive systems of Yamaha and Mercury marine engines. Its main function is to ensure the alignment and retention of shafts, couplings and rotating elements within the propulsion system, preventing unwanted displacements during engine operation. Working under constant vibration and torque loads, this pin ensures the structural integrity of the transmission and prevents component disengagement that could cause loss of power, water ingress into critical areas, or cascading engine damage.

When to replace this part?

Symptoms of pin wear include abnormal vibrations in the transmission, excessive play in couplings, metallic noises during acceleration or gear changes, and in severe cases, visible misalignment of shafts. It is recommended that this component be inspected during each seasonal maintenance check, especially if the engine has been subjected to intensive operations or in silty water. Preventive replacement prevents costly breakdowns at sea and ensures reliable operation of the propulsion throughout the entire sailing season.

Equivalent manufacturer part numbers