PIN 2.5x14

Function and technical context

This 2.5x14 mm key is a torque transmission element that is housed in the keyway of the crankshaft shaft or drive shaft, ensuring that components such as the flywheel, pulley or pinion remain integral with the shaft and do not slip under load. It works within the mechanical transmission system of the outboard motor, acting as a position lock between pressure-fitted or nut-fitted parts. Its integrity is essential: a cut or deformed key causes immediate loss of synchronism between the shaft and the driven component, which can result in serious damage to the crankshaft, ignition or propulsion system.

When to replace this part?

The key usually gives way when the propeller hits a submerged object, acting as a mechanical fuse that protects the crankshaft; The clearest symptom is that the engine rotates but the propeller does not transmit thrust or does so irregularly. It is also advisable to inspect it during each seasonal maintenance, since galvanic corrosion in marine environments can progressively weaken it even if there has been no impact. Replacing it preventively after any propeller strike is the recommended practice to avoid major breakdowns in navigation.