Water Pump Impeller Kit – Fits Mercury/Mariner Outboards 65-220HP & MerCruiser Alpha One Gen 1

Water Pump Impeller Kit – Fits Mercury/Mariner Outboards 65-220HP & MerCruiser Alpha One Gen 1

This water pump impeller repair kit is designed for a wide range of Mercury/Mariner Outboard engines from 65 to 220 HP (2-Stroke, 1970s-1990s models) and MerCruiser Alpha One Gen 1, MC-1, R, and MR stern drives (S/N 2495186-0D469858). It serves as a direct replacement, restoring cooling system performance and reliability.

This kit directly replaces Mercury part numbers 96148A8, 96148Q8, 46-96148A8, 46-96148Q8, 96148T8 and aftermarket part numbers Sierra 18-3217, 18-3316, 18-3517, and GLM 12280.

• Complete Kit: Includes a durable Nylon PA66 plastic housing and a neoprene rubber impeller for a full service.
• Direct Replacement: Engineered to meet OEM specifications for a precise fit and straightforward installation.
• Critical Component: Features a short-vane impeller, essential for correct fitment in specified models.

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.

For MerCruiser owners, confirm your engine model/year in the table below.

Mercury/Mariner Outboards

MerCruiser Stern Drives

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
• 5 x Water Pump Gasket (27-32438, 27-30603, 27-30604)

Installation Guide

1. Disconnect Power: Disconnect the battery and shift the outboard into neutral.
2. Drain Gearcase: Place a drain pan under the lower unit and remove the gearcase lubricant drain screw.
3. Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the engine's drive shaft housing.
4. Access Water Pump: With the lower unit removed, locate and unbolt the water pump housing.
5. Remove Old Components: Slide the old housing and impeller assembly off the drive shaft. Remove the old impeller plate and gaskets.
6. Clean Surfaces: Thoroughly clean the mounting surfaces, removing any old gasket material or sealant residue.
7. Install New Kit: Install the new gaskets, impeller plate, impeller, and housing as provided in the kit. Lightly grease the new impeller.
8. Reassemble: Reinstall the water pump housing, ensuring bolts are torqued to manufacturer specifications.
9. Reattach Lower Unit: Guide the lower unit back into place, aligning the drive shaft, and secure the bolts.
10. Refill and Test: Refill the gearcase with fresh lubricant. Start the engine using a water supply (flushing muffs) to verify strong water flow from the tell-tale outlet.

Troubleshooting & FAQ

Q: How do I confirm this kit will fit my specific engine?
A: The most reliable method is to use your engine's serial number. The compatible serial number ranges are listed in the tables above. Cross-reference the OEM part numbers (e.g., 96148A8, 96148Q8) with your engine's service manual or parts diagram.

Q: What is the difference between part numbers 96148A8 and 96148Q8?
A: There is no functional difference. Both part numbers refer to the same kit. The 'A8' suffix is typically sold through official Mercury Marine dealers, while the 'Q8' suffix (Quicksilver) is packaged for retail stores. The parts are identical.

Q: What are the symptoms of a bad water pump impeller?
A: Common signs of a failing impeller include the engine overheating at idle or low speeds, a weak or non-existent stream of water from the "tell-tale" outlet, and in some cases, a melted water pump housing due to excessive heat.

Q: 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.

Q: 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.

Q: 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.