Water Pump Impeller Kit – Fits Mercury/Mariner 65 HP through V-6 Outboards & MerCruiser I/R/MR/Alpha Drives (Replaces 47-89984Q5)

$0.00

Shipping calculated at checkout.

Water Pump Impeller Kit – Fits Mercury/Mariner 65 HP through V-6 Outboards & MerCruiser I/R/MR/Alpha Drives (Replaces 47-89984Q5) is backordered and will ship as soon as it is back in stock.

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

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Water Pump Impeller Kit – Fits Mercury/Mariner 65 HP through V-6 Outboards & MerCruiser I/R/MR/Alpha Drives (Replaces 47-89984Q5) is designed for a wide range of applications. It is compatible with Mercury/Mariner 65 HP (4-cylinder) through V-6 outboards that use short vane impellers, and also fits MerCruiser I, R, MR, and Alpha sterndrive units within the serial number range of 2495186 to 0D469858.

It serves as a direct replacement for Mercury/Quicksilver part numbers 47-89984Q5, 47-89984T5, and 47-89984T4, providing a reliable interchange solution for maintaining your engine's cooling system.

Engineered as a direct-fit replacement for straightforward installation.
Constructed with durable bronze and stainless steel components for corrosion resistance.
The kit includes the esssential short vane impeller, gaskets, and seals for a complete repair.

Part Number Matrix

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

Brand	Part Number
Mercury/Quicksilver	47-89984Q5
Mercury/Quicksilver	47-89984T5
Mercury/Quicksilver	47-89984T4

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This kit fits a range of Mercury and Mariner outboards from 65 HP (4-cylinder) up to V-6 models that are equipped with a short vane impeller.

For MerCruiser sterndrives, this kit is compatible with I, R, MR, and Alpha One drives built between the serial numbers 2495186 and 0D469858.

Brand	Model	Rated HP	Application	Serial Number Range	OEM Part No.
Mercury/Mariner	Various	65 HP (4-cyl) to V-6	Outboard		47-89984Q5
MerCruiser	I Drive		Sterndrive	2495186–0D469858	47-89984Q5
MerCruiser	R Drive		Sterndrive	2495186–0D469858	47-89984Q5
MerCruiser	MR Drive		Sterndrive	2495186–0D469858	47-89984Q5
MerCruiser	Alpha Drive		Sterndrive	2495186–0D469858	47-89984Q5

Technical Specs

Product Type: Water Pump Impeller Repair Kit
Installation: Direct replacement
Housing Material: Bronze, Stainless Steel components
Weight: 0.44 lb (0.2 kg)
Other Technical Attributes: Short vane impeller design
Dimensions (Box): 8.5" L x 8.5" W x 10.5" H

What’s in the Box

1 x Impeller
1 x Base plate with plate gaskets
1 x Water tube guide sleeve
"O" rings
Gearlube fill & vent screw seals

Installation Notes

Disconnect the battery and ensure the engine is off.
Place a drain pan under the lower unit and remove the gearcase oil drain/fill screws to empty the gear lube.
Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing. Carefully separate the lower unit.
Locate and unbolt the water pump housing cover.
Slide the old impeller off the driveshaft spline. Note the rotational direction of the old vanes.
Clean the housing and base plate surfaces, removing any old gasket material or debris.
Install the new gaskets, base plate, and impeller. Ensure the new impeller vanes are oriented correctly.
Re-install the water pump housing and torque its bolts to the manufacturer's specification.
Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align properly.
Bolt the lower unit securely and refill the gearcase with fresh gear lube.
Reconnect the battery and test the engine using a water supply (flushing muffs or in the water) to verify proper water flow.

Troubleshooting & FAQ

How do I know if this impeller kit fits my engine?

Verify your engine model and serial number against the compatibility table. This kit fits specific Mercury/Mariner outboards (65HP 4-cyl through V-6 with short vane impellers) and MerCruiser I/R/MR/Alpha drives within serial numbers 2495186–0D469858. Always compare the parts in the photos to your old parts before installing.

What are the signs of a failing water pump impeller?

Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the "telltale" outlet, or a high engine temperature alarm. Visible damage like cracked, brittle, or missing vanes on the old impeller upon inspection confirms failure.

What's the difference between this short vane impeller and other types?

Impellers are designed for specific pump housing volumes and flow rates. This "short vane" design is specific to the listed Mercury models. Using the wrong type (e.g., a "long vane" or high-volume impeller) can lead to improper cooling, pump housing damage, or premature failure.

How often should the water pump impeller be replaced?

As a general maintenance guideline, replace the impeller every 1-2 years or every 100-200 hours of use, whichever comes first. For boats used in saltwater or sandy/silty conditions, annual replacement is strongly recommended to prevent overheating.

Is a special tool required for installation?

Standard mechanic's tools, including a socket/wrench set and a screwdriver, are typically sufficient. A torque wrench is highly recommended to tighten bolts to the proper specification and prevent damage to the housing. No other specialized tools are usually needed.

Can I reuse any of the old gaskets or seals?

No. This kit includes all the necessary new gaskets, O-rings, and seals for the repair. Old seals and gaskets can become compressed, brittle, or torn, and reusing them will likely cause leaks and improper pump function.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials and manufactured in an ISO 9002 facility, with batch-inspections for consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options will appear at checkout where available.

Warranty & returns?

This product is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.

Safety & Important Info

Verify images and specifications against 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, typically arriving in 5–15 days.
Manufacturer-Direct Value — We offer fair pricing without ever compromising on materials or quality control.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.