SKU: 48087240717

Water Pump Impeller Kit – Fits Mercury/Mariner/Force 8-25 HP Outboard Engines

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Description

Water Pump Impeller Kit – Fits Mercury/Mariner/Force 8-25 HP Outboard EnginesWater Pump Impeller Kit Fits Mercury Mariner Force 8 25 HP Outboard Engines (Replaces 99157T2, 46 99157T2) This water pump impeller kit provides a complete solution for servicing and rebuilding the lower unit water pump on a wide range of Mercury, Mariner, and Force outboard engines. It is designed for 8 25 HP 2 Stroke models from 1984 2005, ensuring reliable cooling system performance. This kit serves as a direct replacement for Mercury OEM part

Water Pump Impeller Kit – Fits Mercury/Mariner/Force 8-25 HP Outboard Engines (Replaces 99157T2, 46-99157T2)

This water pump impeller kit provides a complete solution for servicing and rebuilding the lower unit water pump on a wide range of Mercury, Mariner, and Force outboard engines. It is designed for 8-25 HP 2-Stroke models from 1984-2005, ensuring reliable cooling system performance.

This kit serves as a direct replacement for Mercury OEM part numbers 99157T2, 85098A2, and 99157A2. It is also cross-compatible with Sierra 18-3214 and Recmar REC46-99157T2.

  • Includes a neoprene impeller, wear plate, gasket, and complete pump housing.
  • Installs in the lower unit of the outboard.
  • Designed for use with gasoline engines.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number Superseded By
Mercury 85098A2 99157T2
Mercury 99157A2 99157T2
Mercury 99157T2
Sierra 18-3214
Recmar REC46-99157T2

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury 8, 9.9, 13.5, 15, 18, 20, 25 8-25 2-Stroke 1984-2005 99157T2 Superseded 99157A2, 85098A2
Mariner 8, 9.9, 13.5, 15, 18, 20, 25 8-25 2-Stroke 1984-2005 99157T2 Superseded 99157A2, 85098A2
Force 25 25 2-Stroke 1995-1998 99157T2 Models H025201/H025211 series

Technical Specifications

Specification Value
Product Type Water Pump Impeller Kit with Housing
Installation Lower Unit
Fuel Type Gasoline
Warranty 1 Year (Marine-Parts eBay seller)
Other Technical Attributes Includes neoprene impeller, wear plate, gasket, and pump housing

Package Contents

  • 1 x Water Pump Kit with Housing (Replaces 99157T2/46-99157T2)
  • 1 x Neoprene Impeller (Replaces 47-85089-3/47-85089-10)
  • 1 x Wear Plate (Replaces 85083)
  • 1 x Gasket (Replaces 27-993261)
  • 1 x Pump Housing (Replaces 46-99157A02)

Installation Guide

  1. Disconnect Power: Disconnect the spark plug wires and the negative battery terminal for safety.
  2. Drain Gear Lube: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gear lube.
  3. Remove Lower Unit: Remove the bolts securing the lower unit to the midsection. Carefully separate the assembly.
  4. Access Pump: Unbolt and remove the old water pump housing to expose the impeller and wear plate.
  5. Clean Surfaces: Thoroughly clean the driveshaft and all mating surfaces, removing any old gasket material or sealant.
  6. Install New Components: Place the new gasket and wear plate onto the lower unit. Slide the new impeller onto the driveshaft, ensuring the keyway is aligned.
  7. Install Housing: Lubricate the inside of the new pump housing and install it over the impeller, turning the driveshaft clockwise to help seat the vanes.
  8. Secure and Reassemble: Fasten the new pump housing. Reinstall the lower unit, making sure the driveshaft, shift shaft, and water tube align correctly.
  9. Final Checks: Refill the lower unit with marine gear lube. Reconnect the battery and spark plug wires.
  10. Test Operation: Using a water source (like flushing muffs), start the engine and verify a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this kit fits my engine?

Check your engine's model, HP, and year against the compatibility table. This kit fits 8-25 HP Mercury, Mariner, and Force 2-stroke outboards from 1984-2005. Verifying your engine's part number against the cross-reference list (99157T2, 85098A2, etc.) is the best way to ensure a match.

How often should I replace the water pump impeller?

As a general maintenance guideline, inspect the impeller annually and replace it every 1-2 years or 100-200 hours of operation, whichever comes first. If you frequently operate in sandy, silty, or saltwater, more frequent inspections and replacements are recommended.

What are the symptoms of a failing impeller?

Common signs of a worn or damaged impeller include a weak or intermittent water stream from the "tell-tale" cooling outlet, engine overheating alarms, or a reduction in engine performance. Upon inspection, a bad impeller may have cracked, brittle, or deformed vanes.

OEM vs. Aftermarket?

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.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 48087240717

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Norman D Warren
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★★★★★ 5
Solid, simple and perfect.
Color: Black, Color: Black
Great simple design. The quality is evident in the thickness of materials. The assembly instructions, hardware and tools provided help minimize the time spent from opening the box to install. This product is packaged well and shipped with the customer convenience in mind. Well done!
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Reviewed in the United States on May 26, 2026
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Ashton Raum
Birmingham, US
★★★★★ 5
Awesome quality
Color: White, Color: White
Take your time installing! It comes with all the instructions and templates. Make sure you’re screwing this into solid wood. I would not recommend you hang your expensive PC from a particle board table. My Pc fits in well and it’s compatible with a ton of different sizes. Mine has been mounted under my desk for about 6 months and is rock solid. I will say, mine is balancing in there. If I don’t have it at its center of gravity, it could tip out. You can adjust it with the various screw holes but make sure you mount it into something solid.
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Reviewed in the United States on April 16, 2026
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Cameron
Pawtucket, US
★★★★★ 5
Fantasic under-desk mounting solution for gaming PC
Color: White
This item comes with an incredible amount of tools and guides for making you successful in mounting your desktop PC under the desk. I am very impressed with the quality of the materials and also the quality of documents included. It feel very sturdy using the included hardware. I would recommend this item for anyone wanting to free up desktop space!
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Reviewed in the United States on March 27, 2026
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Mike
Fort Morgan, US
★★★★★ 5
PC holder that looks great and works on large PCs for easy under desk mounting
Color: Black
After a lot of research and trial and error I finally found the Heavy Duty Under Desk PC Holder. It is the only under desk PC holder that looks good and is able to hold my HP Omen 45L where I want it - under my desk. Putting it together is relatively easy as was the installation to the desk. No messing with cables or round steel tubes to get the job done. The metal is solid, the black powder coating looks great, and the installation hardware is a;l there including a drill bit, hex key, and wrench. You just need to bring a screw driver for the wood screws to attach it to your desk. Read the instructions and make sure you take the depth of your PC into account when attaching the PC holder to your desk, especially if you have a standing desk with motors.
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Reviewed in the United States on October 16, 2025
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Amazon Customer
Lexington, US
★★★★★ 4
Quality Holder
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Very quality holder and very sturdy and stable. I purchased it back in April, and it has been holding up nicely. I would definitely say that it is worth the price. I love that it's adjustable, so if I ever decide I want to new PC case, I can still use it (as long as it fits the dimensions of the holder). Putting it together and mounting it was simple. The only reason I'm giving 4 stars is that it did not come with screws, and I had to purchase some. I hope that has been changed since then.
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