PIÑON 6N0-G5551-00

Function and technical context

The 6N0-G5551-00 pinion is a drive train drive gear on Yamaha and Mercury outboard engines, responsible for transferring rotation of the crankshaft shaft to the reduction box with the necessary gear ratio to drive the propeller. This component works under intense cyclic stresses in the power transmission assembly, supporting accelerations, gear changes and variable water loads. Its wear or breakage causes immediate loss of traction, abnormal vibrations while driving and, in critical cases, total blockage of the drive system that leaves the boat immobile.

When to replace this part?

Symptoms of pinion wear include grinding or rubbing noises from inside the gearbox, difficulty or skipping during gear changes, and unusual vibration during acceleration. It is recommended to inspect the condition of the gear at each seasonal maintenance check, especially after navigation in murky waters or if water has entered the gearbox. Replacing this part preventively avoids catastrophic breakdowns of the drive system that require costly repairs in a boat dock or emergency situations at sea.

Engine Compatibility

Equivalent manufacturer part numbers