Mercury Outboard 23-8M0187255 Propeller Bore Sleeve

Newly designed! This sleeve features a new plastic material and improved locking tabs. The old design sleeve 8M0054695 with 4 locking tabs has been superceded to the new design sleeve 8M0187255 with 3 locking tabs.

The propeller bore sleeve is an integral component of the gear housing and should be inspected when the propeller is removed. The propeller bore sleeve is designed to enhance engine characteristics and boat performance by minimizing engine exhaust escaping between the outside of the propeller and the gear housing. Exhaust gas mixing with the water over the propeller blades will cause a loss of engine and boat performance.