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

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

This water pump impeller kit is designed for a wide range of Mercury and Mariner 2-stroke and 4-stroke outboards from the 1970s to the 1990s, covering models from 30 HP to 70 HP.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring broad compatibility and restoring your engine's cooling system performance.

• Installation Type: Direct OEM replacement
• Material: Durable neoprene rubber impeller with a corrosion-resistant metal alloy hub
• Included Components: Kit typically includes the impeller, key, and necessary 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.

Technical Specifications

Package Contents

• 1 x Water Pump Impeller (47-89983T)
• 1 x Impeller Key (28-56662)
• 2 x Gasket (12-19183-3)

Note: Package contents may vary by supplier. Some kits may include only the impeller and key, while others include additional gaskets and installation instructions. Please verify contents upon receipt.

Installation Guide

For a successful installation, follow these general steps. Always refer to your engine's specific service manual for detailed instructions and torque specifications.

1. Safety First: Disconnect the battery cables to prevent accidental starting.
2. Drain Lubricant: Place a drain pan under the lower unit and remove the drain/fill screws to drain the gear lube.
3. Remove Lower Unit: Unbolt the lower unit (gearcase) from the outboard's midsection. You may need to disconnect the shift shaft.
4. Access Impeller: With the lower unit removed, unbolt and lift the water pump housing to expose the old impeller.
5. Remove Old Impeller: Slide the old impeller off the driveshaft. Take note of the direction the blades are bent. Pry out the old impeller key if it did not come out.
6. Clean and Inspect: Clean the housing interior, wear plate, and all gasket surfaces. Inspect for scoring, warping, or corrosion and replace if necessary.
7. Install New Components: Place the new gaskets and insert the new impeller key into the driveshaft.
8. Install New Impeller: Slide the new impeller onto the shaft while turning the driveshaft clockwise to correctly flex the blades within the housing.
9. Reassemble Pump: Reinstall the water pump housing and tighten the bolts to the manufacturer's recommended torque specifications.
10. Reinstall Lower Unit: Reattach the lower unit to the outboard, ensuring the driveshaft, water tube, and shift shaft are correctly aligned.
11. Refill and Test: Refill the gearcase with fresh lubricant. Reconnect the battery, start the engine in water, and confirm a steady stream from the cooling system's tell-tale port.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my specific engine?
A: The most reliable method is to match your engine's serial number against the ranges listed in the "Compatible Engine Models" table. If your serial number is not listed or you are unsure, cross-reference the part number stamped on your old impeller with our "Part Number Cross-Reference" table.

Q: What are the common signs of a worn or failed water pump impeller?
A: The most common symptoms include the engine overheating at idle or low speeds, and a weak or nonexistent water stream from the "tell-tale" outlet port. Visible damage on the old impeller, such as cracked, brittle, or missing blades, also indicates a need for replacement.

Q: How often should I replace my water pump impeller?
A: For preventative maintenance, it is highly recommended to replace the impeller every 1 to 2 years, or every 100-200 hours of operation, whichever occurs first. Regular replacement prevents unexpected failures that can lead to severe engine damage from overheating.

Q: Is this an OEM part or an aftermarket part?
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.