47-862232A2 Water Pump Impeller for Mercury Mercruiser Sterndrive Inboard | JLM Marine

Water Pump Impeller for Mercury Mercruiser Sterndrive Inboard | 47-862232A2

This water pump impeller is engineered for Mercury Mercruiser V6 & V8 sterndrive and inboard engines with brass sea water pumps, including 4.3L / 262ci, 5.0L / 305ci, 5.7L / 350ci, and 8.1L / 496ci Bravo models from 2000 and newer. Designed to maintain optimal cooling system performance, this impeller fits closed cooling Alpha models and a wide range of Mercruiser inboard configurations.

This impeller directly replaces OEM part numbers 47-862232A2 and 47-8M0104229, as well as aftermarket equivalents from Sierra, GLM, and Mallory, ensuring broad compatibility across Mercruiser sterndrive platforms.

• Package includes: Outboard Impeller
• Fits engines with brass sea water pumps (not compatible with pumps using 5 each of 5/16" bolts)
• Suitable for Bravo, Horizon, MIE, and Scorpion series engines

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.

Technical Specifications

Package Contents

• 1 × Outboard Impeller

Important: This impeller is NOT compatible with pumps that use 5 each of 5/16" bolts. Verify your pump configuration before installation.

Installation Guide

1. Disconnect the battery and ensure the engine is completely cool before beginning work.
2. Locate the water pump housing on your Mercruiser engine and remove the retaining bolts. Set aside the bolts and any washers.
3. Carefully remove the pump cover and inspect the housing interior for debris, corrosion, or damage.
4. Extract the old impeller by gently pulling it out; note the direction of the impeller blades for proper orientation.
5. Clean the pump housing thoroughly using a soft brush and mild solvent. Inspect the wear plate and replace if scored or damaged.
6. Lubricate the new impeller blades with water pump grease or glycerin to ease installation and prevent dry-start damage.
7. Insert the new impeller into the housing, ensuring the blades are oriented in the correct rotation direction (typically opposite to shaft rotation).
8. Reinstall the wear plate and gasket (replace gasket if damaged or worn) and position the pump cover.
9. Torque the retaining bolts to manufacturer specifications in a criss-cross pattern to ensure even seating.
10. Reconnect the water intake hose and verify all connections are secure with no leaks.
11. Reconnect the battery and run the engine briefly in the water or with a flush attachment to confirm proper water flow.
12. Inspect for leaks around the pump housing and connections; re-torque bolts if necessary.

Troubleshooting & FAQ

How do I confirm this impeller fits my Mercruiser engine?
Cross-reference your engine model and serial number with the compatibility table above. If your engine has a brass sea water pump and falls within the listed serial ranges, this impeller will fit. Avoid installation if your pump uses 5 each of 5/16" bolts, as this configuration is not compatible.

How often should I replace my water pump impeller?
Mercruiser recommends replacing the impeller annually or every 300 hours of operation, whichever comes first. If you operate in sandy, debris-laden, or shallow water, inspect and replace more frequently to prevent cooling system failure.

What are the signs of a failing water pump impeller?
Common symptoms include engine overheating, reduced water flow from the tell-tale (pee hole), steam from the engine compartment, or visible damage to impeller blades during inspection. Replace immediately if any of these occur.

Can I use this impeller in a raw water cooling system?
Yes, this impeller is designed for use in both closed cooling Alpha models and raw water inboard systems equipped with brass sea water pumps on compatible Mercruiser engines.

Will this impeller work if my pump housing is aluminum instead of brass?
No, this impeller is specifically engineered for brass sea water pump housings. Using it in an aluminum housing may result in improper fit, reduced cooling efficiency, or premature failure.

Is this an OEM part or an aftermarket replacement?
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.