PIÑON 646-45551-00

Function and technical context

The 646-45551-00 pinion is a transmission gear located in the reduction box of the outboard motor, responsible for transferring power from the crankshaft to the tail shaft and, consequently, to the propeller. It forms a reducing torque together with the ring gear, reducing the engine revolutions to the optimal propeller rotation speed to guarantee efficient traction. Its correct condition is essential to maintain throttle response and propulsive capacity; Premature wear or breakage of the pinion generates progressive loss of power, vibrations transmitted to the rudder and, in severe cases, total transmission blockage.

When to replace this part?

Symptoms of deterioration include metallic noises or creaking noises coming from the gearbox, difficulty engaging gears, and abnormal vibrations in the tiller during navigation. It is recommended to visually inspect the condition of the pinion teeth during each seasonal maintenance, especially after sailing in waters with sediment or sandy bottoms that can introduce abrasive particles into the transmission. Preventive replacement at the first signs of wear prevents catastrophic breakdowns at sea and higher repair costs.

Engine Compatibility

Equivalent manufacturer part numbers