Water Pump Impeller – Fits Mercury/Mercruiser/OMC/Johnson/Evinrude 65-225 HP (Replaces 47-89984T4)

Product Details

This aftermarket Water Pump Impeller – Fits Mercury/Mercruiser/OMC/Johnson/Evinrude 65-225 HP (Replaces 47-89984T4) is a crucial component for maintaining proper engine cooling. It is designed for a wide range of Mercury/Mercruiser (1963–1988), Johnson/Evinrude, and OMC outboard and sterndrive engines from 65 to 225 HP, including V6, L4, and L6 models.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 47-89984T4, OMC 0775450, Force 47-F69406, and GLM 89840, ensuring broad compatibility for engine maintenance and repair.

• Engineered for direct-fit installation in compatible water pump housings.
• Constructed from durable neoprene rubber with a metal insert for longevity.
• Features a 6-blade design to ensure optimal water flow and cooling efficiency.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This impeller is confirmed to fit a wide range of Mercury & Mercruiser models produced between 1963 and 1988. See the table for specific engine series.

Fitment for OMC, Johnson, Evinrude, and Force engines is based on cross-referenced part numbers. Verify your OEM part number before ordering.

Technical Specs

Product Type

Water Pump Impeller

Installation

Direct replacement

Dimensions

Shaft: 22.3 mm (A) × Diameter: 60 mm (B) × Width: 33.8 mm (C)

Material

Neoprene rubber with metal insert

Number of Blades

6

Keyway

Yes

Housing Compatibility

Alpha One, MC I, MR

What’s in the Box

• 1 x Water Pump Impeller (Replaces 47-89984T4)

Installation Notes

1. Disconnect the battery to prevent accidental starting.
2. Place the outboard motor in the tilt position and drain the gearcase oil.
3. Remove the lower unit (gearcase) by unbolting it from the engine's midsection.
4. Locate and remove the bolts securing the water pump housing.
5. Slide the old impeller off the driveshaft, noting the keyway's position.
6. Clean the housing and wear plate, inspecting for scoring or damage. Replace if necessary.
7. Install the new keyway and slide the new impeller onto the driveshaft. Turn the shaft clockwise to seat the blades correctly inside the housing.
8. Reinstall the water pump housing, ensuring a proper seal.
9. Reattach the lower unit to the engine, refill the gearcase oil, and reconnect the battery.
10. Start the engine in a water supply (using muffs or in the water) and verify a strong, steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.