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) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller Repair Kit – Fits Mercury/Mariner 65–225 HP (Re...
Product Details
This aftermarket Water Pump Impeller Repair Kit – Fits Mercury/Mariner 65–225 HP (Replaces 47-89984T5) is designed for a broad range of 2-stroke Mercury and Mariner V6 outboard engines from 65 to 225 HP (1963–1990s), as well as MerCruiser I/R/MR/Alpha One sterndrives (s/n 2495186–0D469858). It provides a reliable solution for maintaining your engine's cooling system performance.
This kit serves as a direct interchange for multiple OEM part numbers, including Mercury 47-89984T5, 47-89984Q5, 47-89984T3, 47-89984T4, 47-89984T6, and aftermarket equivalents like Sierra 18-3017 and GLM 89840.
- Engineered for direct replacement to ensure straightforward installation.
- Features a durable neoprene rubber impeller with a corrosion-resistant brass hub.
- Includes all necessary gaskets, seals, and hardware for a complete service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 47-89984T5 |
| Mercury | 47-89984Q5 |
| Mercury | 47-89984T3 |
| Mercury | 47-89984T4 |
| Mercury | 47-89984T6 |
| Mercury | 803631T |
| Mercury | 89984B2 |
| Mercury | 89984B3 |
| Mercury | 89984T6 |
| Sierra | 18-3017 |
| GLM | 89840 |
| Mallory | 9-45306 |
| Red Rhino | MM-984 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is compatible with various Mercury and Mariner outboard engines. Please verify your model, horsepower, and serial number range for a correct fit.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4 Cylinder | 65 | 2-Stroke | 1963–1971 | 47-89984T5 | Serial #1542745-3293183 |
| Mercury | 70 | 2-Stroke | 1961 | 47-89984T5 | Serial #1413611-1566239 | |
| Mercury | 4 Cylinder | 75 | 2-Stroke | 1984–1989 | 47-89984T5 | Serial #6432901-UP |
| Mercury | 80 | 2-Stroke | 1969–1983 | 47-89984T5 | Serial #1355468-3493912 | |
| Mercury | 4 Cylinder | 80 | 2-Stroke | 1973–1982 | 47-89984T5 | Serial #4831999-6432900 |
| Mercury | 85 | 2-Stroke | 1973–1977 | 47-89984T5 | Serial #1460999-4831998 | |
| Mercury | 4 Cylinder | 85 | 2-Stroke | 1973–1977 | 47-89984T5 | Serial #4590512-UP |
| Mercury | 6 Cylinder | 90 | 2-Stroke | 1978–1986 | 47-89984T5 | Serial #4845301-UP |
| Mercury | 95 | 2-Stroke | 1966–1967 | 47-89984T5 | Serial #1869776-2318585 | |
| Mercury | 6 Cylinder | 100 | 2-Stroke | 1962–1969 | 47-89984T5 | Serial #1464949-3253111 |
| Mercury | JET | 105 | 2-Stroke | 1984–1993 | 47-89984T5 | Serial #D182000-UP |
| Mercury | 110 | 2-Stroke | 1966–1967 | 47-89984T5 | Serial #1870204-2314955 | |
| Mercury | 115 | 2-Stroke | 1968–1972 | 47-89984T5 | Serial #2836019-UP | |
| Mercury | 6 Cylinder | 115 | 2-Stroke | 1966–1988 | 47-89984T5 | Serial #4694237-UP |
| Mercury | 125 | 2-Stroke | 1967–1971 | 47-89984T5 | Serial #2314956-3253111 | |
| Mercury | 135 | 2-Stroke | 1972–1973 | 47-89984T5 | Serial #2839369-3293233 | |
| Mercury | V | 135 | 2-Stroke | 1986–1988 | 47-89984T5 | Serial #904646-UP |
| Mercury | 140 | 2-Stroke | 1973–1980s | 47-89984T5 | Serial #3293234-UP | |
| Mercury | JET | 140 | 2-Stroke | 1994–1995 | 47-89984T5 | Serial #D082000-UP |
| Mercury | 150 | 2-Stroke | 1970s–1988 | 47-89984T5 | Serial #3502806-4868647 | |
| Mercury | V | 150 | 2-Stroke | 1978–1988 | 47-89984T5 | All models |
| Mercury | V | 175 | 2-Stroke | 1976–1988 | 47-89984T5 | All models |
| Mercury | V | 200 | 2-Stroke | 1978–1988 | 47-89984T5 | All models |
| Mercury | V | 220 | 2-Stroke | 1980s | 47-89984T5 | All models |
| Mercury | V | 225 | 2-Stroke | 1980s | 47-89984T5 | All models |
Also fits select MerCruiser sterndrive models. Check your serial number to ensure compatibility.
| Brand | Model | OEM Part No. | Notes |
|---|---|---|---|
| MerCruiser | MC I | 47-89984T5 | S/N 2495186 & Later |
| MerCruiser | MR/Alpha One | 47-89984T5 | S/N 6854393-0D469858 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct replacement
- Material
- Neoprene rubber impeller with brass hub
- Impeller Diameter
- 60.0 mm (2.36 inches)
- Impeller Height
- 33.8 mm (1.33 inches)
- Hub Shaft Diameter
- 22.2 mm (0.87 inch)
- Number of Blades
- 6
- Weight
- 99.2 g (3.50 oz)
- Warranty
- 1 Year (aftermarket)
What’s in the Box
- 1 x Water Pump Impeller (Replaces 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 Notes
- Disconnect the battery and remove the engine cowling.
- Shift the outboard into forward gear to ease driveshaft disconnection.
- Drain the gearcase oil completely.
- Unbolt and carefully lower the lower unit (gearcase) from the engine.
- Remove the water pump housing bolts and lift the housing to expose the impeller.
- Take note of the old impeller's blade direction before removing it and the wear plate.
- Clean all surfaces and install the new gasket, wear plate, and drive key.
- Install the new impeller by rotating the driveshaft clockwise while pushing down.
- Apply a light coat of marine grease to the housing interior and install it with the new gasket and seals.
- Reattach the lower unit, refill the gearcase oil, and reconnect the battery.
- Test the engine with a water supply to ensure proper cooling system function.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
The best way is to check your serial number. This kit fits Mercury/Mariner 65–225 HP outboards and MerCruiser Alpha One sterndrives within the serial number ranges listed in the compatibility tables. Always compare the photos and specifications to your old part before ordering.
What are the signs of a failing water pump impeller?
Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "telltale" outlet, and a brittle or cracked appearance on the old impeller's blades upon inspection.
How often should the water pump impeller be replaced?
For preventative maintenance, it is recommended to inspect and/or replace the impeller every one to two years, or every 100-200 hours of operation, depending on usage (especially in saltwater or sandy/silty conditions).
Can I just replace the impeller instead of using the whole kit?
While possible, it is highly recommended to replace all components in the kit, including the wear plate, gaskets, and seals. These parts wear together and replacing only the impeller can lead to premature failure or poor sealing.
What is the difference between this aftermarket kit and an OEM part?
This listing is an aftermarket replacement, not an OEM component. It is built to OEM-level specifications with comparable materials, such as a neoprene impeller and brass hub. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are your shipping speeds and costs?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free, and expedited options may be available at checkout depending on your location.
What is the warranty and return policy?
This kit is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our policy page or reach out for instructions.
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.
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