Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040)

Water Pump Impeller Kit – Fits Mercury/MerCruiser 135/150 HP EFI 4-Stroke (Replaces 46-8M0061040)

This water pump impeller repair kit is designed for Mercury 135/150 HP EFI 4-Stroke outboards. It is also compatible with F150 and F75-115 1.7L EFI Four Stroke outboard models, providing a reliable solution for maintaining your engine’s cooling system.

This kit serves as a direct replacement for Mercury part numbers 46-8M0061040 and 8M0061040, ensuring proper fit and function.

• Installation Location: Mounts in the upper housing assembly.
• Core Components: Includes a new impeller, housing, face plate, and gaskets for a complete repair.
• Engine Compatibility: Specifically engineered for Mercury 135/150 HP EFI 4-Stroke outboards.

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

This water pump repair kit includes:

• 1 x Upper Housing
• 1 x Impeller
• 1 x Face Plate
• 1 x Gaskets (Set)
• 1 x Key

Installation Guide

Follow these general steps for installation. Refer to your engine’s service manual for detailed instructions.

1. Disconnect the battery and ensure the engine is turned off and cool.
2. Remove the lower unit from the outboard motor.
3. Unbolt and remove the old water pump housing assembly.
4. Clean the mounting surfaces and inspect for any damage.
5. Install the new gaskets, face plate, and impeller into the new housing.
6. Ensure the impeller key is properly seated on the driveshaft.
7. Slide the new water pump assembly into place, aligning all components correctly.
8. Torque the bolts to the manufacturer's specification in a crisscross pattern.
9. Reinstall the lower unit onto the outboard.
10. Reconnect the battery and test the engine in the water, ensuring a steady stream of water from the tell-tale.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my engine?
A: This kit is designed for Mercury 135/150 HP EFI 4-stroke outboards and select F75-115 1.7L EFI models. To ensure compatibility, cross-reference your engine's required part number with 46-8M0061040 and check the detailed compatibility table on this page.

Q: What are the signs of a failing water pump impeller?
A: Common signs of a worn or damaged impeller include the engine overheating at idle or low speeds, a weak or intermittent water stream from the engine's "tell-tale" outlet, and visible cracks or brittleness on the impeller's rubber vanes upon inspection.

Q: How often should I replace the water pump impeller?
A: For optimal engine protection and cooling performance, it is recommended to inspect the impeller annually and replace it every one to two years. Replacement may be needed more frequently if you operate your boat in saltwater or in water with high levels of sand or silt.

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.