Water Pump Impeller Kit – Fits Mercury/MerCruiser V6/V8 4.3-8.2L (Replaces 47-8M0104229, 47-862232A2)

Water Pump Impeller Kit – Fits Mercury/MerCruiser V6/V8 4.3-8.2L (Replaces 47-8M0104229, 47-862232A2)

This water pump impeller kit is designed for Mercury MerCruiser sterndrive engines from 2000 and newer equipped with brass sea water pumps. It provides comprehensive coverage for V6 and V8 engines with displacements ranging from 4.3L to 8.2L, including Alpha, Bravo, MPI, and CARB variants.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and reliable performance. This kit is engineered to meet or exceed original equipment specifications.

• Installation Type: Direct replacement
• Primary Material: Durable neoprene rubber with a brass hub
• Application: Designed for brass sea water pumps

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

This kit includes the following components:

• 1 x Impeller 8M0104229 / 18-3016-1 (Replaces 47-862232A2, 47-8M0104229)
• 1 x O-Ring 25-841807

Installation Guide

Follow these steps for a successful installation. Ensure the engine is off and has cooled down completely before starting.

1. Safety First: Disconnect the battery and close the fuel and water inlets.
2. Drain the System: Drain the cooling system to prevent water spills.
3. Access the Pump: Locate the sea water pump on the engine. It may be necessary to remove other components like belts or hoses to gain access.
4. Remove the Pump Cover: Unscrew the bolts holding the pump cover in place and carefully remove it. Note the orientation of the old impeller blades.
5. Extract the Old Impeller: Use impeller pullers or two screwdrivers to gently pry out the old impeller from the pump housing.
6. Clean and Inspect: Clean the inside of the pump housing and the cover. Check for scoring, cracks, or wear.
7. Install the New O-Ring: Replace the old O-ring with the new one provided in the kit. Apply a light coat of lubricant to the O-ring.
8. Insert the New Impeller: Lubricate the inside of the pump housing and the new impeller with a suitable marine lubricant. Insert the new impeller, making sure to bend the blades in the same direction as the old one (typically in the direction of engine rotation).
9. Replace the Cover: Re-install the pump cover and tighten the screws evenly in a crisscross pattern to the manufacturer's specified torque.
10. Reconnect and Test: Reconnect all hoses, belts, and the battery. Open the water inlet. Start the engine and check for leaks and proper water flow from the exhaust.

Troubleshooting & FAQ

Q: How do I confirm this impeller kit fits my specific engine?
A: Start by checking the "Compatible Engine Models" table on this page. Cross-reference your engine's model, displacement, and year. Additionally, verify that your current part number matches one of the numbers listed in our "Part Number Cross-Reference" table, such as 47-862232A2 or 47-8M0104229.

Q: What are the common signs that my water pump impeller needs to be replaced?
A: The most common signs of a failing impeller are engine overheating at idle or low speeds, a weak or no water stream from the exhaust outlet, and a cracked or brittle appearance of the impeller blades upon inspection.

Q: How often should I replace my impeller?
A: As a general maintenance rule, it is recommended to inspect your impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can vary depending on operating conditions (e.g., saltwater vs. freshwater, sandy/silty water).

Q: OEM vs. Aftermarket?
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.