UANOFCN Water Pump Impeller Kit for Mercury 30–125 HP — 8M0113799 Neoprene Impeller & Stainless Wear Plate

UANOFCN 8M0113799 is a complete water pump impeller rebuild kit designed to refresh cooling systems on compatible Mercury outboard engines quickly and affordably.

This kit contains the parts most commonly replaced during a water pump service so you can restore circulation and reduce the risk of overheating caused by worn components. Engineered with a stainless wear plate, neoprene impeller, and multiple gaskets and seals, the kit fits a range of Mercury and Sierra part numbers and is intended for DIY maintenance or shop installation. Before ordering, verify your outboard model, serial number and year to confirm compatibility.

Which Mercury outboards does this impeller kit fit?

The UANOFCN 8M0113799 kit is compatible with many Mercury outboard engines commonly found in recreational and commercial boats. It lists replacements for several Mercury and Sierra part numbers used across 30–125 HP ranges, but fit can vary by model year and serial block.

• Replaces Mercury 46-8M0113799 and 46-43024A7 / A4 / A5 / A6 part numbers
• Also replaces Mercury 43026T9 and Sierra 18-3688 where applicable
• Commonly used in Mercury 30–125 HP outboards; confirm with your engine plate

What parts are included and what materials are used?

The kit supplies a full set of components needed for a standard water pump rebuild, assembled from durable materials chosen for corrosion and wear resistance. That makes the kit useful for routine service intervals and mid-season repairs.

• Neoprene impeller for flexible blade performance
• Stainless steel wear plate for longevity and heat resistance
• Nylon PA66 tube, non-asbestos gaskets, housing, covers, seals and screws
• Drive key and additional gaskets/seals to complete the rebuild

How easy is installation and who should install it?

Installation is straightforward for anyone comfortable with outboard maintenance, basic hand tools and following a service manual. If you’re not familiar with water pump procedures or torque specs, a marine mechanic can complete the job quickly to ensure proper seal orientation and cooling alignment.

• Typical shop or home tools are sufficient for removal and replacement
• Follow torque and alignment steps from your engine’s service manual
• Inspect mating surfaces and impeller housing for grooves or damage during install

How can I confirm I’m ordering the correct kit?

Double-check the engine’s model plate and serial number before purchasing; those details determine which pump design your outboard uses. If there is any uncertainty, you can compare OEM part numbers or contact the seller with your engine information for verification.

• Locate the model/serial tag on the outboard cowling or mounting bracket
• Match OEM part numbers (e.g., 46-8M0113799, 43024A7, 43026T9, Sierra 18-3688)
• Ask the seller or consult your Mercury service manual for confirmation

Who is this for: Boaters, marine technicians, and DIYers who need a comprehensive, lower-cost replacement kit for Mercury-compatible water pumps will find this UANOFCN kit useful. It’s aimed at routine maintenance and mid-season emergency repairs for small to medium outboards, but accurate fit depends on model year and serial number—verify before purchase. If you prefer professional installation, bring your engine information to a trusted marine service shop to ensure the correct parts and proper installation technique.