Water Pump Impeller Kit – Fits Mercury/Mercruiser 65-225 HP (Replaces 47-89984T3, 47-89984)

Water Pump Impeller Kit – Fits Mercury/Mercruiser 65-225 HP (Replaces 47-89984T3, 47-89984)

This water pump impeller kit is designed for a wide range of Mercury/Mercruiser and Force/Chrysler outboard engines. It fits Mercury/Mercruiser 65-225 HP 2-Stroke outboards from the 1960s to 1990s and is also compatible with Alpha One, MR, and pre-Alpha sterndrive units (through S/N D469858). It also services Force/Chrysler 65-225 HP outboards that utilize short-vane impellers.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 47-89984T3, 47-89984T4, 47-89984T5, and 47-89984T6.

• Installation Method: Direct OEM replacement
• Connection Type: Mounts directly to the drive shaft
• Kit Contents: Includes impeller, key, and gaskets for a complete service

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Mercury/Mercruiser Outboard Models

Mercruiser Sterndrive Models

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (Replaces 47-89984T3, 47-89984, 47-30221, 47-65960, 47-85460)
• 1 x Impeller Key (Replaces 28-56654)
• 2 x Gaskets

Installation Guide

1. Disconnect the battery and remove the engine cowling.
2. Shift the outboard into forward gear to ease driveshaft reconnection.
3. Drain the gearcase lube from the lower unit.
4. Remove the bolts securing the lower unit (gearcase) to the upper leg.
5. Carefully separate the lower unit from the engine. Be mindful of the driveshaft and shift shaft.
6. Unscrew the bolts on the water pump housing cover and slide it up off the driveshaft.
7. Remove the old impeller, gaskets, and Woodruff key from the driveshaft.
8. Clean all mating surfaces thoroughly, removing any old gasket material or debris.
9. Install the new Woodruff key, new gaskets, and the new impeller. Turn the driveshaft clockwise while pushing down on the impeller to seat the blades correctly.
10. Reassemble the water pump housing and torque bolts to manufacturer specifications.
11. Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube align correctly.
12. Refill the gearcase with fresh lubricant, reinstall the battery, and test the engine with a reliable water source.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: Verify your engine's model, horsepower, and year/serial number against the compatibility tables provided. For Mercury owners, use the linked serial number guide for precise identification. This impeller fits a broad range of Mercury/Mercruiser 65-225 HP outboards and Alpha One Gen 1 sterndrives (up to S/N 0D469858).

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "telltale" outlet, and visible damage (cracks, missing blades, brittleness) upon inspection of the old impeller.

Q: How often should I replace the impeller?
A: As a crucial part of preventative maintenance, it is recommended to replace your impeller every 1-2 years or every 100-200 hours of operation. More frequent replacement may be necessary if you operate in sandy, silty, or saltwater environments.

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.