Water Pump Impeller Kit – Fits Mercury Marine & MerCruiser 65-225HP (Replaces 46-96148A8, 46-96148Q8)

Water Pump Impeller Kit – Fits Mercury Marine & MerCruiser 65-225HP (Replaces 46-96148A8, 46-96148Q8)

This complete water pump impeller repair kit is designed for Mercury Marine 65-225HP 2-Stroke outboards (1970–1990) that use short-vane impellers. It also fits MerCruiser Alpha One, I, R, and MR sterndrives with serial numbers between 2495186 and 0D469858.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and restoring your engine's cooling system performance.

• Complete Repair Kit: Includes a new housing, neoprene impeller, gaskets, O-rings, and all necessary hardware for a full replacement.
• High-Quality Materials: Features a durable Nylon PA66 plastic housing and a robust neoprene rubber impeller for reliable, long-lasting performance.
• Direct Fitment: Engineered to meet or exceed OEM specifications for a hassle-free installation.

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 Outboard Engines

MerCruiser Sterndrive Engines

Technical Specifications

Package Contents

• 1 x Water Pump Housing (46-48743A1, 46-96148, 46-96148A1)
• 1 x Impeller (47-30221, 47-65960, 47-85460)
• 1 x Water Pump Housing Bushing (26-29677)
• 1 x Water Tube Guide (23-29804, 23-29804T)
• 1 x Seal Ring Gasket (26-45577, 26-455771)
• 1 x Impeller Plate (30605)
• 2 x Drain Screw Gasket (191833)
• 5 x O-Ring (25-30271, 25-896523, 25-27018)
• 1 x Slinger Rubber Ring (25-30271)
• 1 x Cup
• 1 x Water Pump Housing Bushing (26-29677)
• 5 x Water Pump Gasket (27-32438, 27-30603, 27-30604)

Installation Guide

1. Disconnect Power: Disconnect the battery and spark plug wires to prevent accidental starting.
2. Access Lower Unit: Drain the gearcase oil and unbolt the lower unit (gearcase) from the outboard's leg or sterndrive.
3. Remove Old Pump: Locate the water pump housing on top of the lower unit. Remove the bolts securing the housing and lift it off.
4. Extract Old Impeller: Pull out the old impeller, plate, and gaskets. Clean the mating surfaces thoroughly, removing all old gasket material and debris.
5. Install New Components: Place the new gaskets and wear plate. Slide the new impeller onto the driveshaft, turning the shaft clockwise to bed the vanes.
6. Install New Housing: Apply a light coat of marine grease to the inside of the new housing and install it over the impeller.
7. Secure and Reassemble: Replace and tighten the housing bolts to the manufacturer's torque specifications. Reinstall the lower unit, refilling the gearcase oil.
8. Test Operation: Reconnect the battery and spark plugs. Start the engine in the water or with a proper flush-out device and check for a steady stream of water from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my specific engine?

A: The best way is to verify your engine's model and serial number against the compatibility tables above. This kit is designed for Mercury 65-225HP outboards (1970-1990) and MerCruiser Alpha One/I/R/MR sterndrives (S/N 2495186–0D469858). Cross-referencing your old part number with our list (e.g., 46-96148A8, 46-96148Q8) is also a reliable method.

Q: What are the signs of a failing water pump impeller?

A: Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and in some cases, steam from the exhaust. A damaged impeller cannot pump enough water to cool the engine effectively.

Q: How often should I replace the water pump impeller?

A: 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, depending on usage conditions (e.g., saltwater vs. freshwater).

Q: What is the significance of the "short-vane impeller" design?

A: This refers to a specific impeller geometry used in certain Mercury/MerCruiser models from the 1970s to the early 1990s. Using the correct vane type (short vs. long) is critical for proper pump housing fit and cooling performance. This kit contains the correct short-vane impeller for the listed engines.

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.