Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Pump Impeller Kit
$133.00
$133.00
Subtotal: $133.00

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Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30 - 125 HP (Replaces 46 - 8M0113799, 46 - 43024A7) - JLM Marine Boat Parts Limited

Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7)

$133.00

Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7)

$133.00

Water Pump Impeller Repair Kit – Fits Mercury/Mariner 30-125 HP (Replaces 46-8M0113799, 46-43024A7)

This water pump impeller repair kit is designed for a wide range of Mercury and Mariner 2-stroke and 4-stroke outboard engines from 30 HP to 125 HP, covering various models from the 1990s through the 2020s. It provides the essential components needed to service your engine's water pump and restore its cooling performance.

This kit is a direct replacement for Mercury part numbers 46-8M0113799 and the superseded part number 46-43024A7. It also serves as an aftermarket replacement for Sierra part number 18-3688.

  • Engineered as a direct replacement part for straightforward installation.
  • High-quality aftermarket kit built to meet or exceed original equipment specifications.
  • Restores cooling system efficiency to prevent engine overheating.

Part Number Cross-Reference

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

Brand Part Number Notes
Mercury 46-8M0113799 Supersedes 46-43024A7
Mercury 46-43024A7 Superseded by 46-8M0113799
Sierra 18-3688 Aftermarket Replacement

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Mercury 3-Cylinder Bigfoot 30 4-Stroke Up to 1B226999 46-8M0113799 Superseded 46-43024A7
Mercury 4-Cylinder 40, 45, 50, 60 4-Stroke Various 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder 55, 60, 65 2-Stroke 0G760300 & Up 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder 65 Jet 2-Stroke 0G760300-1B000001 & Up 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder 75 2-Stroke 0G760300 & Up 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder (1.5L) 75 2-Stroke (OptiMax) 0T980000-2B112577 46-8M0113799 Superseded 46-43024A7
Mercury 4-Stroke 75, 80, 90, 100, 115 4-Stroke Various 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder 90 2-Stroke 0G760300 & Up 46-8M0113799 Superseded 46-43024A7
Mercury 3-Cylinder (1.5L) 90, 115, 125 2-Stroke (OptiMax) Various 46-8M0113799 Superseded 46-43024A7
Mercury 4-Cylinder 100, 115, 125 2-Stroke 0G760300-0T979999 46-8M0113799 Superseded 46-43024A7

Technical Specifications

Specification Value
Product Type Water Pump Impeller Repair Kit
Installation Direct replacement
Other Technical Attributes High-quality aftermarket replacement for OEM specifications
Warranty Varies by manufacturer

Installation Guide

  1. Disconnect the negative battery cable. Locate and unbolt the lower unit (gearcase) from the engine's midsection.
  2. Carefully lower and remove the gearcase to expose the water pump assembly on top of it.
  3. Remove the bolts securing the water pump housing cover. Slide the housing up and off the driveshaft.
  4. Take note of the old impeller's vane direction before removing it. Remove the old impeller, key, gaskets, and O-rings.
  5. Thoroughly clean the inside of the pump housing and the base plate, removing any old gasket material or debris.
  6. Install the new gaskets and O-rings as supplied in the kit.
  7. Slide the new impeller key into the driveshaft slot.
  8. Install the new impeller by pushing it down over the key while turning the driveshaft clockwise to bed the vanes correctly.
  9. Reinstall the water pump housing and tighten the bolts to the manufacturer's specified torque.
  10. Carefully guide the lower unit back into position, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
  11. Secure the lower unit with its mounting bolts and refill the gearcase with fresh lubricant.
  12. Once assembled, test the engine using a water supply (flushing muffs) to confirm a strong water stream from the tell-tale outlet.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Verify your engine's model, horsepower, and serial number range against the detailed compatibility table above. For Mercury owners, use the provided Serial Number Guide to confirm your details before ordering.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating, a weak or absent water stream from the "tell-tale" outlet, or in severe cases, a melted plastic water pump housing. Regular inspection is key.

How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of operation. Service intervals should be shorter in saltwater or silty conditions.

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.

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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