17-81896M – SHEAR PIN – Mercury

The 17-81896M Mercury shear pin is an OEM drive shear pin used in older Mercury and Mariner outboard engines. This metal pin acts as a safety link between rotating drive components and the gearcase or propeller assembly. It helps protect internal drive gears and shafts by shearing if the propeller or drive unit hits a hard object.

Shear pins are designed to break before heavier and more expensive parts are damaged. In normal operation, the 17-81896M Mercury shear pin holds powertrain components in place while transmitting torque. However, when a heavy impact occurs, it fails at a predictable point so that only this inexpensive pin needs replacement. This prevents costly gear or shaft damage, especially in shallower water or debris-filled conditions.

This part also pairs with related Yamaha hardware such as straight pin 90250-03M10 for compatible installation and secure fitment.

If your engine suddenly loses propeller drive after a sting or snub while underway, the shear pin may have broken. A broken shear pin typically results in a sudden loss of propulsion without other apparent damage. Replacing it restores proper torque transmission between the drive and gearcase.

Shop at Arizona Outboard Dismantlers to keep your outboard running strong and ready for the water.