Water Pump Impeller – Fits Mercury/MerCruiser V6 & V8 4.3L-8.2L Engines (Replaces 47-862232A2, 18-3016-1)

Water Pump Impeller – Fits Mercury/MerCruiser V6 & V8 4.3L-8.2L Engines

This water pump impeller is designed for a wide range of Mercury/MerCruiser V6 and V8 sterndrive engines with displacements from 4.3L to 8.2L (262-502 CID). It serves as a crucial component for maintaining proper engine temperature by circulating raw water through the cooling system.

It directly replaces Mercury part numbers 47-862232A2 and 18-3016-1, ensuring a precise fit and reliable performance for the listed compatible models.

• Installation Type: Direct replacement with a press-fit connection.
• Engine Fuel Type: Compatible with gasoline engines.
• Function: Key component in the raw water cooling system.

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 (Replaces 47-862232A2/18-3016-1)

Installation Guide

1. Safety First: Disconnect the battery before beginning any work.
2. Access Lower Unit: Securely position the sterndrive for access to the lower unit.
3. Drain Gear Lube: Drain the gear lube from the lower unit to prevent spills.
4. Remove Lower Unit: Loosen and remove the bolts securing the lower unit to the upper housing.
5. Separate Assembly: Carefully separate the lower unit from the upper housing, watching for the shift shaft.
6. Access Pump: Locate and unbolt the water pump housing cover.
7. Remove Old Impeller: Take out the old impeller, noting the rotational direction of its vanes.
8. Clean and Inspect: Clean the impeller housing and inspect the wear plate and housing for scoring or damage. Replace if necessary.
9. Install New Impeller: Lubricate the new impeller and housing. Install the new impeller by rotating the driveshaft in its normal operating direction to correctly seat the vanes.
10. Reassemble Pump: Reinstall the water pump housing with new gaskets and torque bolts to manufacturer specifications.
11. Reattach Lower Unit: Reassemble the lower unit to the upper housing and refill with the correct type and amount of gear lube.
12. Test Operation: Reconnect the battery. Start the engine in a water-fed environment (using flushing muffs or in the water) and confirm a steady stream from the water tell-tale.

Troubleshooting & FAQ

Q: How do I confirm this fits my engine?
A: First, check your engine model and horsepower against the 'Compatible Engine Models' table. For many MerCruiser models, fitment after a certain year depends on the engine serial number. Verify your engine’s serial number is within the specified range (e.g., '0M300000 and above') to ensure compatibility.

Q: What are the signs of a failing impeller?
A: Common signs of a worn or failed impeller include the engine overheating, especially at idle or low speeds; a weak or inconsistent water stream from the "tell-tale" outlet; or discovering brittle, cracked, or broken rubber pieces during inspection.

Q: How often should I replace my water pump impeller?
A: For preventative maintenance, it is recommended to inspect the impeller annually. Replacement is advised every 1-2 years or every 100-200 hours of engine use, whichever comes first. More frequent replacement may be necessary if you operate in saltwater or water with high sediment content.

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.