UANOFCN Outboard Water Pump Impeller Kit for Mercury 6–15 HP — 42089A5 Complete Rebuild Kit with Neoprene Impeller & SS Wear Plate

UANOFCN 42089A5 is a complete replacement water-pump impeller kit designed to restore reliable cooling for Mercury 6–15 HP outboard engines.

This kit contains all core components needed to service the water pump for many Mercury and compatible Force/Sears outboards, including a neoprene impeller, stainless wear plate and multiple gaskets and seals. It’s supplied as a full assembly package so you can replace the worn parts that stop circulating cooling water, reduce overheating risk, and extend engine life when fitted correctly.

Which engines does this impeller kit fit?

The 42089A5 kit is made for Mercury Marine outboards in the 6 HP through 15 HP range and commonly used variations across 2- and 4-stroke models. It is also compatible with certain Force and Sears 9.9 and 15 HP motors and replaces several Mercury part numbers and GLM references.

• Fits Mercury 6–15 HP outboards (2- and 4-stroke) including non-BigFoot and Sea Pro variants
• Compatible with Force and Sears 9.9/15 HP models where specified
• Replaces Mercury part numbers 42089A5, 42089A4, 42089A3 and GLM 12051
• Always verify your motor model and serial number before ordering

What parts are included in the kit and what are they made from?

This package supplies the common wearable parts of a pump assembly so you can rebuild the pump housing during a service. Materials are chosen for durability in a marine cooling environment—neoprene for the impeller and stainless steel for the wear face—while gaskets and rings keep seals tight.

• Neoprene impeller (47-42038-2) for flexible vane performance
• SS316 wear plate and steel pump housing components for corrosion resistance
• Multiple gaskets, oil seals, quad ring and fastener for a full rebuild
• Complete parts list included for easy cross-check with original components

How will installing this kit affect engine cooling and maintenance?

Replacing worn impeller components restores proper water flow through the cooling passages and reduces the risk of overheating caused by cracked vanes or leaking seals. Fitting all supplied seals and plates ensures the pump operates closer to factory tolerances and prolongs intervals between services.

• Restores designed coolant throughput and pressure
• Reduces cavitation and vane failure by renewing the impeller and seating
• Prevents water leaks with new gaskets and oil seals
• Simplifies future maintenance with a single comprehensive kit

What should I check before buying and during installation?

Always confirm your outboard’s model and serial number to ensure correct fitment, and inspect the lower unit for additional damage such as scoring on the housing or a worn key on the driveshaft. During installation, follow torque specs for fasteners and check that all seals are seated to avoid immediate leaks.

• Verify motor make, model and serial number against the kit compatibility list
• Inspect pump cavity and driveshaft for scoring or play before assembly
• Use appropriate lubricants on seals and follow factory torque settings
• Run the engine and confirm steady water flow from the tell-tale after install

Who is this for: Boaters, marine mechanics and DIY enthusiasts who own Mercury 6–15 HP or compatible Force/Sears outboards and need a reliable, full-service pump rebuild kit. If you want a single purchase that contains the impeller, wear plate, housing components, multiple gaskets and seals, and associated hardware to return your lower unit cooling system to proper working order, this UANOFCN kit provides a complete replacement option—just be sure to confirm fitment with your engine’s model and serial number before ordering.