Sierra 18-3087 MerCruiser 1999 & Older Impeller

A replacement impeller for engine-mounted sea water pumps on MerCruiser Bravo sterndrives and inboards, 1999 and older. Impeller vanes are rubber over a metal hub, and they wear from the tips in. Run in sandy water and that wear accelerates, so the pump starts making noise before the temperature gauge tells you anything.

• Sierra part 18-3087
• For MerCruiser Bravo sterndrives and inboards with engine-mounted sea water pumps, 1999 and older
• Replaces Mercury 47-59362 and 47-59362T, MerCruiser 47-59362T1, 47-593621 and 47-59362A1
• Also interchanges with Mallory 9-45375, EMP 47-03908, GLM 89740, Pro Marine 64362 and Redline RL3087

If the pump is rattling, grinding or knocking, the impeller is already telling you. Change it before the vanes let go and end up in the cooler.