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

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

This premium quality water pump impeller kit is designed for Mercury MerCruiser sterndrive engines with brass sea water pumps. It is compatible with a wide range of V6 and V8 engines from 4.3L to 8.2L, manufactured from 2000 and newer.

This kit directly replaces multiple OEM and aftermarket part numbers, ensuring broad compatibility for models including MPI Alpha, MPI Bravo, CARB Alpha, CARB Bravo, and H.O. series.

• Kit Includes: 1x Impeller, 1x O-Ring
• Material: Durable neoprene rubber with a solid brass hub for corrosion resistance.
• Application: Specifically for Mercury engines equipped with 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

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

Installation Guide

1. Disconnect the battery and close the fuel and water inlets before starting.
2. Locate the sea water pump housing on the engine block.
3. Loosen the bolts securing the pump cover and carefully remove it. Be prepared for some water to spill.
4. Take note of the old impeller's blade orientation before removing it. Use needle-nose pliers to grip the hub and pull it out.
5. Clean the inside of the pump housing with a clean cloth and inspect it for scoring, corrosion, or wear.
6. Lightly lubricate the new O-ring and the inside of the pump housing with marine grease or soapy water.
7. Install the new impeller by pushing it in while turning the driveshaft clockwise to bend the blades correctly.
8. Ensure the new O-ring is properly seated in its groove and replace the pump cover.
9. Tighten the cover bolts evenly in a star pattern to the manufacturer's specified torque. Do not overtighten.
10. Reconnect the battery and open the seacock/water inlet.
11. Start the engine for a few seconds and immediately check for proper water flow from the exhaust and for any leaks around the pump housing.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: This kit fits MerCruiser V6/V8 engines (4.3L-8.2L) from 2000 and newer that use a brass sea water pump. Please verify your engine model and year against the compatibility table. The surest way is to match the OEM part number (47-862232A2 or 47-8M0104229) with your existing part or service manual.

Q: What are the signs of a failing impeller?
A: Common signs include the engine overheating at idle or low speeds, a weak or non-existent water stream from the tell-tale outlet, or finding pieces of black rubber in the cooling system. Visible cracks, stiffness, or missing blades on the old impeller upon inspection are definitive signs it needs replacement.

Q: How often should I replace my water pump impeller?
A: For optimal performance and engine safety, we recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of use. Replacement intervals should be shorter in saltwater or silty/sandy conditions.

Q: What is the difference between this impeller and the original Mercury part?
A: This is a high-quality aftermarket part designed to meet or exceed OEM specifications. It is made from a durable neoprene compound with a solid brass hub, just like the original, providing reliable cooling performance and longevity at a better value.

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.