Mercury/Mariner 20 & 30 HP Outboard Impeller (Vintage Models)

This impeller is tailored to specific small Mercury/Mariner outboards, namely 20 HP and 30 HP two-stroke models from the late 1970s and 1980s. Those engines have unique water pump requirements, and this impeller (cross-referencing Mercury part numbers 47-65958/47-89982) provides the exact fit and function needed. If you own a classic 20hp or 30hp Mercury, replacing the impeller with this part will ensure the engine runs at proper temperature and avoids overheating.

Even small engines can overheat quickly if the impeller is aged or damaged. By installing this new 6-blade impeller, you guarantee steady cooling flow during your boat rides, whether you’re slow trolling or making a quick dash across the bay. It's made with a quality neoprene rubber that can handle the rigors of pumping water often mixed with sand or weeds in shallow areas. Keeping a fresh impeller in these vintage motors is essential to maintain their reliability and performance.

• Engine Fit: Made for Mercury “200” series 20 HP and “300” series 30 HP outboards of the late 70s/80s. These models often came with unique impellers – this replacement matches those OEM specs. Also applicable to some Mariner equivalents of the same era.
• Vintage Boats: Commonly found on small skiffs, classic runabouts, or as auxiliary motors on sailboats from that period. This impeller helps those older engines on 3–5 m boats stay adequately cooled during fishing, sailing, or recreational cruising.
• Preventative Maintenance: Avoids potential engine overheating and damage in hard-to-find vintage parts. Replacing the impeller is a simple yet critical step in any restoration or maintenance of an older outboard – an inexpensive part that protects a valuable engine.
• Installation & Spare: Simple to install in the water pump housing with standard tools. Given the age of these engines, it’s wise to have a spare impeller handy. If the “tell-tale” cooling stream weakens, it’s an immediate sign to replace the impeller.
• Engine Longevity: By maintaining proper cooling, this impeller helps extend the life of your classic Mercury/Mariner. A well-cooled engine runs smoother, retains power, and avoids piston or cylinder damage caused by overheating.