Water Pump Impeller Kit – Fits Mercury/Mariner 30-70 HP Outboards (Replaces 47-89983Q1, 47-89983T2)

Water Pump Impeller Kit – Fits Mercury/Mariner 30-70 HP Outboards (Replaces 47-89983Q1, 47-89983T2)

This water pump impeller repair kit is designed for a wide range of Mercury/Mariner 30-70 HP 2-Stroke outboards and certain Jet Drive models produced between 1963 and 1990. It provides the essential components needed to restore your engine's cooling system.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility and a proper fit for reliable performance.

• Complete Repair Kit: Includes a new impeller, gaskets, O-rings, and wear plate for a full service.
• Direct Fit: Engineered as a direct OEM replacement for straightforward installation without modifications.
• Restores Performance: Replaces worn or damaged components to restore proper water flow and prevent overheating.

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.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller
• 1 x Gasket Set
• 1 x O-Ring Set
• 1 x Plate

Installation Guide

1. Disconnect the negative battery cable and remove the engine cowling.
2. Shift the outboard into neutral and remove the bolts securing the lower unit (gearcase).
3. Carefully separate the lower unit from the upper leg to expose the driveshaft and water pump.
4. Remove the bolts holding the water pump housing cover in place and slide it up the driveshaft.
5. Note the rotational direction of the existing impeller vanes before sliding it off the driveshaft.
6. Clean the interior of the pump housing and the wear plate, removing any old gasket material or mineral deposits.
7. Install the new gaskets and wear plate provided in the kit.
8. Slide the new impeller onto the driveshaft. While pushing down, turn the driveshaft clockwise to help flex the vanes into the correct orientation inside the housing.
9. Reinstall the water pump housing and tighten the bolts to the torque specified in your service manual.
10. Apply a light coating of marine grease to the drive shaft splines and reinstall the lower unit.
11. Reconnect the battery, start the engine using a water supply (flushing muffs), and confirm a steady stream of water from the tell-tale port.
12. Check for any water leaks around the water pump housing.

Troubleshooting & FAQ

How do I confirm this impeller kit fits my specific Mercury outboard?
Check your engine's model, horsepower, and serial number against the compatibility tables provided on this page. For Mercury engines, the serial number range is the most accurate way to verify the fit, especially for models made across different years and regions.

What are the signs that my water pump impeller needs to be replaced?
Common signs include the engine overheating at idle or low speeds, a weak or intermittent water stream from the "tell-tale" outlet, or finding brittle, cracked, or missing rubber vanes on the old impeller during an inspection.

How often should I replace my water pump impeller?
As a general maintenance guideline, it is recommended to inspect and/or replace the water pump impeller every 1-2 years or every 100-200 hours of operation. Service intervals can vary based on usage, especially in saltwater or sandy/silty conditions.

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.