GHmarine Water Pump Impeller Kit for Johnson / Evinrude 8–15HP Outboards — Neoprene Impeller & Housing (1974+)

GHmarine 394711 is a complete water pump impeller repair kit designed to restore cooling flow on Johnson/Evinrude 8–15HP outboards from 1974 and up.

If your small outboard is showing signs of reduced cooling, overheating, or low water flow, this GHmarine kit supplies the replacement parts most commonly required to rebuild the raw-water pump. The kit matches many OEM and aftermarket part numbers, includes the neoprene impeller and housing components, and supports both 2-stroke and 4-stroke Johnson/Evinrude engines in the 8–15HP range. It’s intended for routine maintenance or emergency field repairs to bring the engine’s cooling system back to operating condition.

Which engine models and part numbers does this kit fit?

This kit was made to cover a broad range of Johnson and Evinrude small outboards. It cross-references multiple OEM numbers so you can replace worn pump components without hunting for exact original parts.

• Compatible with Johnson/Evinrude 9.9HP and 15HP models (2-stroke and 4-stroke).
• Replaces common numbers including 0394711, 18-3327, Mallory 9-48201, GLM 12050 and others.
• Also fits several legacy part numbers listed for older OMC applications.

What components are included and what materials are used?

The kit supplies all the parts needed to rebuild the impeller assembly so you don’t need multiple purchases. Parts are chosen for durability and typical service-life performance in salt and freshwater conditions.

• Neoprene impeller designed for flexibility and reliable vane recovery.
• Pump housing, wear plate, pump cup, and O-ring to reseal the unit.
• Impeller key, installation bolts, water seal and grommet included for a complete rebuild.

How difficult is installation and what should I check during replacement?

Installation is straightforward for anyone comfortable with basic hand tools and small-engine maintenance. Take care to inspect mating surfaces and the drive key, and replace any additional worn hardware to ensure a leak-free fit and correct impeller orientation.

• Remove the lower unit or pump cover per your service manual to access the impeller.
• Check shaft and keyway for wear; clean mating surfaces before assembly.
• Use supplied bolts, seal, and O-ring; torque to specifications and verify water flow after reassembly.

When should you replace the impeller and related pump parts?

Replace the impeller and wear components as part of routine seasonal service or when you notice decreased cooling or visible damage. Waiting can risk engine overheating and more expensive repairs.

• Replace every season or every 100 operating hours for frequent boaters.
• Inspect for torn vanes, hardening, or chunks missing from the neoprene impeller.
• Replace if you detect reduced water discharge from the telltale or overheating signs during operation.

Who is this for: The GHmarine 394711 kit is intended for boat owners, marine technicians, and DIYers maintaining Johnson/Evinrude 8–15HP outboards. It’s a practical choice for anyone restoring an older OMC pump or stocking a repair kit for field repairs, delivering the common replacement pieces needed to restore pump function quickly and affordably. If you’re unsure about fitment, contact the seller with your engine model and serial for confirmation before purchasing.