47-85089-3 Water Pump Impeller for Mercury Mariner Chrysler Force | JLM Marine

47-85089-3 Water Pump Impeller for Mercury Mariner Chrysler Force | JLM Marine

This high-quality aftermarket water pump impeller is designed to fit a wide range of Mercury, Mariner, Chrysler, and Force outboard engines from 18HP to 75HP. Compatible with both 2-stroke and 4-stroke models, this impeller ensures reliable cooling system performance across multiple engine configurations including standard, BigFoot, EFI, and carburetor variants.

Direct replacement for OEM part numbers 47-85089-3, 47-85089-10, and 18-3057, providing seamless fitment and dependable operation. Manufactured to OEM specifications, this impeller delivers consistent water flow to protect your engine from overheating.

• Complete with key/pin for secure installation
• Fits both 2-cylinder and 3-cylinder engine configurations
• Compatible with standard and BigFoot models

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 × Outboard Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor following manufacturer procedures.
2. Locate and remove the water pump housing cover by unscrewing the retaining bolts.
3. Carefully extract the old impeller from the pump housing, noting the direction of the vanes.
4. Clean the pump housing thoroughly, removing any debris, corrosion, or old gasket material.
5. Inspect the pump housing and wear plate for damage or excessive wear; replace if necessary.
6. Lubricate the new impeller with water pump grease or soapy water to ease installation.
7. Insert the key/pin into the impeller hub slot, ensuring it is properly seated.
8. Carefully slide the impeller onto the driveshaft, rotating it in the correct direction (usually counterclockwise when viewed from above).
9. Ensure all impeller vanes are properly folded in the correct rotational direction inside the housing.
10. Replace the pump housing cover with a new gasket, tightening bolts in a star pattern to manufacturer torque specifications.
11. Reinstall the lower unit onto the outboard motor, ensuring proper alignment and secure fastening.
12. Reconnect the fuel line, run the engine in a test tank, and verify proper water flow from the telltale.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my specific engine?
A: Cross-reference your engine's serial number with the compatibility table above. You can also verify the OEM part number stamped on your current impeller or consult your engine's parts diagram using the provided Mercury or Chrysler/Force resources.

Q: How often should I replace the 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 notice reduced water flow from the telltale, overheating, or visible damage to the vanes, replace it immediately regardless of age.

Q: What are the signs that my impeller is failing?
A: Common symptoms include reduced or no water flow from the telltale (indicator stream), engine overheating alarms, steam from the engine, loss of power, or visible damage such as cracked, broken, or melted impeller vanes during inspection.

Q: Can I install this impeller myself or do I need a professional?
A: If you have mechanical experience and the proper tools, you can install this impeller yourself by following the steps in the Installation Guide. However, professional installation is recommended if you are unfamiliar with lower unit disassembly to ensure proper fitment and avoid potential engine damage.

Q: Should I replace any other components when changing the impeller?
A: Yes, it's highly recommended to replace the water pump gaskets, seals, and O-rings as a complete kit whenever changing the impeller. Inspect the wear plate and pump housing for scoring or damage and replace if necessary to ensure optimal performance.

Q: Is this an OEM part 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.