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Description
Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha One & Outboard Motors (Replaces 46-96148A8, 96148Q8)Water Pump Impeller Kit Fits Mercury Mercruiser Alpha One & Outboard Motors This water pump impeller repair kit is designed for Mercury Mercruiser Alpha One sterndrive units (19831990) and a wide range of Mercury outboard motors from 65 HP to 220 HP that use short vane impellers. It serves as a comprehensive solution for replacing worn or damaged water pump components to prevent engine overheating. This kit is a direct replacement for multiple OEM and
Water Pump Impeller Kit – Fits Mercury/Mercruiser Alpha One & Outboard Motors
This water pump impeller repair kit is designed for Mercury/Mercruiser Alpha One sterndrive units (1983–1990) and a wide range of Mercury outboard motors from 65 HP to 220 HP that use short-vane impellers. It serves as a comprehensive solution for replacing worn or damaged water pump components to prevent engine overheating.
This kit is a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 46-96148A8, 96148Q8, 46-96148T8, 46-96148A5, 46-42579A4, 46-44292A4, 46-48747A3, Sierra 18-3320, GLM 12120, and Mallory 9-48307.
- Includes a durable neoprene impeller and PA66 nylon housing.
- Engineered as a direct-fit replacement for straightforward installation.
- Complete with all necessary gaskets, seals, and o-rings for a full service.
Part Number Cross-Reference
Use this table to confirm equivalent part numbers across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 46-96148A8 |
| Mercury | 96148Q8 |
| Mercury | 46-96148T8 |
| Mercury | 96148A5 |
| Mercury | 46-42579A4 |
| Mercury | 46-44292A4 |
| Mercury | 46-48747A3 |
| Sierra | 18-3320 |
| GLM | 12120 |
| Mallory | 9-48307 |
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.
Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.
Mercury Outboard Motors
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | Outboard | 65 | 2-Stroke | Serial # 1542745-3293183 | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 70 | 2-Stroke | Serial # 1503959-1566239 | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 75 | 2-Stroke | Serial # 6432901 & Up | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 80 | 2-Stroke | Serial # 2559001-6432900 | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 85 | 2-Stroke | Serial # 1566240-4861998 | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 90 | 2-Stroke | Serial # 1766824 & Up | 46-96148A8 | 4 Cylinder |
| Mercury | Outboard | 100SS | 2-Stroke | Serial # 1503332-2836018 | 46-96148A8 | SS model |
| Mercury | Outboard | 110 | 2-Stroke | Serial # 1870204-2314955 | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 115 | 2-Stroke | Serial # 2836019 & Up | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 125 | 2-Stroke | Serial # 2314956-2839368 | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 135 | 2-Stroke | Serial # 2839369-3293233 | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 140 | 2-Stroke | Serial # 3293234 & Up | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 150 | 2-Stroke | Serial # 3502806 & Up | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 175 | 2-Stroke | Serial # 4301235 & Up | 46-96148A8 | 6 Cylinder |
| Mercury | Outboard | 200 | 2-Stroke | Serial # 4839034 & Up | 46-96148A8 | Not including V-200 DFI 3.0L |
| Mercury | Outboard | 220 | 2-Stroke | Serial # OB117316 & Up | 46-96148A8 | 6 Cylinder |
| Mercury | Optimax | 135-175 | 2-Stroke | 46-96148A8 | DFI Engine | |
| Mercury | V6 models | 135-225 | 2-Stroke | 46-96148A8 | 2.4L & 2.5L |
Mercury MerCruiser Stern Drives
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Pre-Alpha | 1970-1983 | 46-96148A8 | |
| MerCruiser | Alpha One | 1983-1990 | 46-96148A8 | Serial # 6225577 and up |
| MerCruiser | I | 46-96148A8 | Serial # 2491586-0D469858 | |
| MerCruiser | R | 46-96148A8 | Serial # 2491586-0D469858 | |
| MerCruiser | MR | 46-96148A8 | Serial # 2491586-0D469858 |
Johnson/Evinrude Applications
| Brand | Model | Rated HP | Stroke | Years | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | 3-Cylinder | 60 | 4-Stroke | 1998-Up | Alternate fitment |
| Johnson/Evinrude | 3-Cylinder | 65 | 2-Stroke | 1979-2001 | Alternate fitment |
| Johnson/Evinrude | 3-Cylinder | 70 | 4-Stroke | 1998-Up | Alternate fitment |
| Johnson/Evinrude | 3-Cylinder | 75 | 2-Stroke | 1979-88 | Alternate fitment |
Technical Specifications
| Specification | Value |
|---|---|
| Product Type | Water Pump Impeller Kit |
| Installation | Direct Replacement for Mercury/Mercruiser systems |
| Housing Material | Nylon PA66 Plastic (Water Pump Housing) |
| Impeller Material | Neoprene Rubber |
| Base Size | 2.356 inches (59.8 mm) |
| Weight | 330 grams (0.73 lbs) |
| Compatible With | Mercury Marine outboard motors and Mercruiser Alpha One stern drives |
| Mercruiser Serial Range | 2491586 through 0D469858 |
Package Contents
- 1 x Water Pump Impeller
- 1 x Pump Housing (Upper)
- 1 x Face Plate
- 1 x Drive Key (or Pin)
- 1 x Face Seal
- 1 x Seal Carrier
- 1 x Water Tube Coupling
- 1 x Set of Gaskets
- 1 x Set of O-Rings
- 2 x Gearlube Fill & Vent Screw Seals
Note: Pump base assembly is not included in this kit.
Installation Guide
- Safety First: Disconnect the boat's battery before beginning any work.
- Drain Lubricant: Place a drain pan under the lower unit and remove the drain/fill screws to empty the gearcase lubricant.
- Remove Lower Unit: Unbolt and carefully detach the lower unit (gearcase) from the engine's upper assembly.
- Access Pump: Unscrew the bolts securing the water pump housing to the lower unit.
- Remove Old Components: Lift off the old housing. Remove the impeller, wear plate, and gaskets. Note their orientation.
- Clean Surfaces: Thoroughly clean the mounting surface on the gearcase, removing any old gasket material or debris.
- Install New Kit: Place the new gasket and wear plate. Slide the new impeller onto the drive shaft (turn clockwise) and install the drive key.
- Reassemble Pump: Fit the new housing over the impeller and bolt it down to the specified torque.
- Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align correctly. Secure with bolts.
- Refill Lubricant: Fill the gearcase with the recommended marine gear lubricant from the bottom hole until it emerges from the top hole. Re-install both screw seals.
- Test Operation: Reconnect the battery. Safely start the engine in water and confirm a steady stream of water from the "tell-tale" exhaust port.
Troubleshooting & FAQ
Q: How do I confirm this kit fits my engine?
A: This kit is designed for Mercury/Mercruiser Alpha One sterndrives (1983-1990) and various 65-220 HP outboards. Please check your model against the compatible engine tables and verify your serial number falls within the specified range (2491586 to 0D469858 for many Mercruiser models).
Q: Is the pump base included?
A: No, the base assembly is not included in this kit. This kit contains the upper plastic housing, impeller, face plate, gaskets, and related seals as listed in the 'Package Contents' section.
Q: What are common signs that my impeller needs replacing?
A: Common indicators include engine overheating, a weak or non-existent stream of water from the "tell-tale" outlet, or visible damage like cracked, stiff, or brittle impeller vanes found during inspection.
Q: What is the difference between this kit and the OEM part?
A: This is an aftermarket replacement part built to meet or exceed original equipment specifications using high-quality neoprene rubber for the impeller and PA66 nylon for the housing. It serves as a direct replacement for multiple OEM part numbers, including 46-96148A8 and 96148Q8.
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.
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy