Water Pump Impeller Kit – Fits Mercury/Mariner Outboard 30-70 HP (Replaces 47-89983Q1, 47-89983T1, 47-89983T2)

Water Pump Impeller Kit – Fits Mercury/Mariner Outboard 30-70 HP (Replaces 47-89983Q1, 47-89983T1, 47-89983T2)

This water pump impeller kit is designed for Mercury and Mariner outboard engines from 30 to 70 HP (2-Stroke). It covers a wide range of models manufactured from the 1970s through the late 1990s, identified by specific serial number ranges.

This kit serves as a direct replacement for Mercury OEM parts 47-89983Q1, 47-89983T1, and 47-89983T2, as well as aftermarket parts like Sierra 18-3207.

• Installation Type: Vehicle Specific Fit
• Key Component: Includes impeller, gaskets, and O-rings for a complete service.
• Engine Compatibility: Fits various 2-stroke Mercury & Mariner models (30-70 HP).

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

• Water Pump Impeller (47-89983T1)
• Gaskets and O-rings

Installation Guide

Follow these general steps to replace your water pump impeller. Professional installation is recommended.

1. Disconnect the Battery: Disconnect the negative battery cable to prevent accidental starting.
2. Drain the Gearcase: Place a drain pan under the lower unit and remove the gearcase oil drain and vent plugs to drain the lubricant.
3. Remove the Lower Unit: Disconnect the shift linkage (if applicable) and remove the bolts securing the lower unit (gearcase) to the engine's midsection. Carefully lower the unit.
4. Access the Water Pump: The water pump housing is located on top of the lower unit. Remove the bolts securing the pump housing cover.
5. Inspect and Remove Old Parts: Take note of the order of all components. Remove the old impeller, wear plate, gaskets, and O-rings. Clean all mating surfaces thoroughly.
6. Install the New Impeller: Lightly grease the new wear plate and gaskets. Slide the new impeller onto the driveshaft, turning the shaft clockwise to bend the vanes in the correct direction as you press it into the housing.
7. Reassemble the Pump: Install the new gaskets and O-rings. Secure the water pump housing cover and torque the bolts to the manufacturer's specification.
8. Reinstall the Lower Unit: Carefully guide the lower unit back into place, ensuring the driveshaft, water tube, and shift shaft align properly. Reinstall and tighten the mounting bolts.
9. Refill Gearcase Oil: Fill the gearcase with fresh marine gear lube through the drain plug hole until it flows out of the vent hole. Reinstall the vent and drain plugs.
10. Test the System: Reconnect the battery. Start the engine using a water source (flushing muffs or in the water) and check for a steady stream of water from the "telltale" outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my specific engine?
The most reliable way is to match your engine's serial number to the ranges listed in the "Compatible Engine Models" table. While the kit fits a wide range of 30-70 HP Mercury/Mariner outboards, the serial number is the key to confirming a perfect fit.

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 water stream from the "telltale" outlet, and in some cases, a high-temperature alarm from your console gauges.

How often should I replace my impeller?
As a general maintenance guideline, it's recommended to inspect your impeller annually and replace it every 1-2 years, depending on usage (especially in saltwater or sandy/silty conditions). Proactive replacement prevents overheating and potential engine damage.

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.