47-16154-3 Outboard Rubber Impeller with Key/Pin for Mercury Mariner 4-S 2 2.5 3.5 | JLM Marine

Outboard Rubber Impeller with Key/Pin – Fits Mercury Mariner 4-Stroke 2, 2.5, 3.5 HP (Carb)

This aftermarket rubber impeller is precision-engineered to fit Mercury Mariner 4-stroke 2 HP, 2.5 HP, and 3.5 HP carbureted outboard engines. Designed to deliver reliable water pump performance, this impeller ensures consistent cooling to protect your engine from overheating during operation.

Direct Replacement for OEM Part Number: 47-16154-3. This impeller comes complete with the drive key/pin for straightforward installation.

• Complete kit includes rubber impeller and drive key/pin
• Designed for small 4-stroke carbureted outboards
• Drop-in replacement for OEM part 47-16154-3

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

• Outboard Rubber Impeller
• Drive Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard engine. Refer to your service manual for specific disassembly instructions.
2. Remove the water pump housing cover and carefully extract the old impeller. Inspect the housing and plate for damage or corrosion.
3. Clean the impeller cavity thoroughly, removing any debris or old gasket material. Ensure all surfaces are smooth and free of contaminants.
4. Lubricate the new impeller blades with glycerin or water pump grease (never petroleum-based products). This prevents blade damage during installation.
5. Insert the drive key/pin into the impeller hub slot, ensuring it is fully seated. Verify the key is correctly positioned before proceeding.
6. Carefully compress the impeller blades and slide the impeller into the pump housing, rotating in the correct direction. Ensure all blades are properly aligned.
7. Install a new water pump gasket and reassemble the pump housing cover. Torque fasteners to manufacturer specifications.
8. Reinstall the lower unit onto the engine, aligning the driveshaft and water tube properly. Double-check all connections are secure.
9. Reconnect the fuel line and flush the cooling system with fresh water. Run the engine briefly to verify proper water flow from the telltale indicator.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Mercury Mariner engine?
A: Verify your engine is a 4-stroke carbureted model rated at 2, 2.5, or 3.5 HP. Cross-check your original impeller against OEM part number 47-16154-3. If your part number matches or your engine model is listed in our compatibility table, this impeller will fit.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2–3 years or 200–300 hours of operation, whichever comes first. If you run in sandy or debris-filled water, or if the engine has overheated, inspect and replace the impeller more frequently.

Q: What are the signs that my impeller is failing?
A: Common symptoms include reduced or no water flow from the telltale/pilot hole, engine overheating, weak stream pressure, or visible damage to impeller blades. If you notice any of these signs, inspect and replace the impeller immediately to prevent engine damage.

Q: Can I use petroleum-based grease when installing the impeller?
A: No. Petroleum-based products will damage the rubber blades. Always use glycerin, water pump grease, or a lubricant specifically designed for rubber impellers to ensure safe installation and optimal performance.

Q: Is this an OEM impeller or an aftermarket replacement?
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.