Water Pump Impeller Kit – Fits Mercury/Mercruiser 150/175/200HP 2-Stroke (Replaces 46-96148A5)

Water Pump Impeller Kit – Fits Mercury/Mercruiser 150/175/200HP 2-Stroke (Replaces 46-96148A5)

This water pump impeller kit is designed for a wide range of Mercury/Mercruiser 2-Stroke Outboards from 65 HP to 220 HP, including models from the 1970s, 1980s, and 1990s. It also fits MerCruiser Stern Drives, including Pre-Alpha and Alpha One models (1970–1990).

This kit serves as a direct replacement for multiple OEM part numbers, including Mercury 46-96148A5, 46-96148A8, 46-96148Q8, 46-96148T8, 46-42579A4, 46-44292A4, and 46-48747A3, ensuring full compatibility.

• Installation Method: Direct Replacement
• Engine Compatibility: Fits various 2-Stroke Mercury/Mercruiser outboard and stern drive engines.
• Core Component: Includes the essential water pump impeller required for cooling system repairs.

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.

Mercury/Mercruiser Outboards

Mercruiser Stern Drives

Technical Specifications

Package Contents

• 1 x Water Pump Impeller

Installation Guide

A new water pump impeller is critical for engine cooling. Professional installation is recommended. The following are general steps for replacement:

1. Disconnect Power: Disconnect the battery before starting any work.
2. Access the Lower Unit: Drain the gearcase oil and unbolt the lower unit (gearcase) from the upper section of the outboard.
3. Remove the Water Pump Housing: Locate and remove the bolts securing the water pump housing to the lower unit.
4. Inspect and Replace Impeller: Remove the old impeller, noting the rotational direction of the fins. Clean the housing interior and inspect it for wear or damage.
5. Install New Impeller: Lightly lubricate the new impeller and housing. Install the new impeller, ensuring the fins are oriented in the correct rotational direction.
6. Replace Gaskets and Seals: Install the new gaskets, seals, and wear plate included in your kit.
7. Reassemble Housing: Securely fasten the water pump housing back onto the lower unit.
8. Reattach Lower Unit: Reinstall the lower unit to the outboard, ensuring the driveshaft, shift shaft, and water tube are properly aligned.
9. Refill and Test: Refill the gearcase with the correct oil. Start the engine in a safe testing environment (using a water source) and verify that water is exiting the "tell-tale" port, indicating proper pump operation.

Troubleshooting & FAQ

How do I confirm this impeller kit fits my specific engine?
The best way is to match your engine's serial number to the ranges listed in the "Compatible Engine Models" table. The serial number is typically found on a plate attached to the transom bracket. If you are unsure, use the provided Mercury Serial Number Guide or consult your owner's manual.

What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the tell-tale outlet, or a high-temperature alarm sounding on the console. Visible damage to the old impeller, such as cracked, brittle, or missing fins, also confirms it needs replacement.

How often should I replace the water pump impeller?
As a general maintenance rule, it is recommended to inspect and/or replace the water pump impeller every 100 operating hours or once per year, whichever comes first. This interval may be shorter if you frequently operate in sandy, silty, or saltwater 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.