Water Pump Impeller Repair Kit – Fits Mercury/Mariner 65–225 HP (Replaces 47-89984T5)

Water Pump Impeller Repair Kit – Fits Mercury/Mariner 65–225 HP (Replaces 47-89984T5)

This water pump impeller repair kit provides a reliable solution for maintaining the cooling system on a wide range of Mercury/Mariner and MerCruiser engines. It is designed for Mercury/Mariner 65–225 HP, 2-stroke V6 outboard engines (from the 1960s to 1990s) and MerCruiser I/R/MR/Alpha One sterndrives (serial numbers 2495186–0D469858).

Engineered as a direct replacement part, this kit ensures proper fit and performance, restoring your engine's cooling efficiency. It replaces multiple Mercury part numbers, including 47-89984T5, 47-89984Q5, 47-89984T3, and more.

• Installation Type: Direct replacement for a straightforward installation.
• Core Component: Includes a durable neoprene rubber impeller with a corrosion-resistant brass hub.
• Complete Kit: Comes with the impeller, face plate, gaskets, seals, and other necessary hardware for a full 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/Mariner Outboard Engines

MerCruiser Sterndrives

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (47-89984T5)
• 1 x Face Plate with Gasket
• 1 x Drive Key/Pin
• 1 x Water Tube Guide Sleeve
• 2 x O-rings
• 2 x Gearlube Fill & Vent Screw Seals

Installation Guide

1. Disconnect the negative battery cable to prevent accidental starting.
2. Drain the gearcase lube from the lower unit.
3. Remove the bolts securing the lower unit (gearcase) and carefully detach it from the engine's midsection.
4. Unbolt and remove the water pump housing to access the impeller.
5. Remove the old impeller, face plate, gaskets, and key. Take note of the impeller vane direction.
6. Thoroughly clean the mating surfaces of the housing and wear plate, removing any old gasket material or debris.
7. Install the new gasket and face plate onto the gearcase.
8. Slide the new drive key into the driveshaft and install the new impeller, rotating it in the direction of engine operation to correctly orient the vanes.
9. Install new o-rings/seals and reinstall the water pump housing, ensuring bolts are torqued to the manufacturer's specification.
10. Carefully guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly.
11. Refill the gearcase with the specified marine gear lube.
12. Reconnect the battery. Before launching, use a flush attachment to supply water and test the engine, checking for a strong water stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?
Check your engine's model and serial number against the ranges provided in the compatibility tables. This kit is specifically designed for Mercury/Mariner outboards (65-225 HP, 1963-1990s) and MerCruiser I/R/MR/Alpha One sterndrives (s/n 2495186–0D469858). Verifying these details is the best way to ensure a correct fit.

What are the signs that my water pump impeller needs replacing?
Common signs include the engine overheating at idle or low speeds, a weak or inconsistent water stream from the "telltale" outlet, or a brittle or cracked appearance on the old impeller upon inspection. As a rule, impellers should be inspected annually and replaced every 1-2 years or 100-200 hours of use, regardless of appearance.

What is the difference between this aftermarket kit and an OEM one?
This is a high-quality aftermarket kit designed to meet or exceed original equipment manufacturer (OEM) specifications. The impeller is made from a durable neoprene rubber compound with a corrosion-resistant brass hub, providing a reliable and cost-effective alternative to the OEM part.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.