Water Pump Impeller Kit for Mercury/Mariner Outboards 65–220 HP and MerCruiser Alpha One Gen 1 – Replaces 96148A8, 96148Q8
Water Pump Impeller Kit for Mercury/Mariner Outboards 65–220 HP and MerCruiser Alpha One Gen 1 – Replaces 96148A8, 96148Q8 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Impeller Kit for Mercury/Mariner Outboards 65–220 HP and...
Water Pump Impeller Kit for Mercury/Mariner Outboards 65–220 HP and MerCruiser Alpha One Gen 1 – Replaces 96148A8, 96148Q8 is backordered and will ship as soon as it is back in stock.
Product Details
This complete water pump impeller kit is designed for selected Mercury and Mariner 2-stroke outboards from 65 to 220 HP, as well as MerCruiser Pre-Alpha, Alpha One Gen 1, MC-1, R, and MR stern drives using the specified short-vane water pump configuration. The kit includes the pump housing, impeller, plate, gaskets, seals, guide components, and related hardware needed to service the water pump assembly.
It is listed as a replacement for Mercury references including 96148A8, 96148Q8, 46-96148A8, 46-96148Q8, and 96148T8, along with selected Sierra and GLM aftermarket references. Always verify the exact engine model, serial number, existing housing, and impeller configuration before ordering.
- Complete replacement kit for servicing the water pump assembly.
- Includes a nylon PA66 plastic water pump housing.
- Includes a neoprene rubber impeller for water circulation.
- Designed for applications using a short-vane impeller.
Part Number Matrix
The following references are associated with this replacement kit. Part-number listings do not replace model and serial-number verification.
| Brand | Part Number |
|---|---|
| Mercury | 96148A8 |
| Mercury | 96148Q8 |
| Mercury | 46-96148A8 |
| Mercury | 46-96148Q8 |
| Mercury | 96148T8 |
| Sierra | 18-3217 |
| Sierra | 18-3316 |
| Sierra | 18-3517 |
| GLM | 12280 |
Engine and Model Compatibility
Compatibility depends on the complete engine model and serial-number range. Confirm the application below before installation. The outboard applications listed are 2-stroke models using the short-vane impeller configuration.
| Brand | Model | Rated HP | Stroke | Year | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4-Cylinder | 65 | 2-Stroke | 96148A8 | Serial 1542745–3293183 | |
| Mercury | 4-Cylinder | 70 | 2-Stroke | 96148A8 | Serial 1503959–1566239 | |
| Mercury | 4-Cylinder | 75 | 2-Stroke | 96148A8 | Serial 6432901 and up | |
| Mercury | 4-Cylinder | 80 | 2-Stroke | 96148A8 | Serial 2559001–6432900 | |
| Mercury | 4-Cylinder | 85 | 2-Stroke | 96148A8 | Serial 1566240–4861998 | |
| Mercury | V6 | 90 | 2-Stroke | 96148A8 | Serial 1766824 and up | |
| Mercury | V6 SS | 100 | 2-Stroke | 96148A8 | Serial 1503332–2836018 | |
| Mercury | V6 | 110 | 2-Stroke | 96148A8 | Serial 1870204–2314955 | |
| Mercury | V6 | 115 | 2-Stroke | 96148A8 | Serial 2836019 and up | |
| Mercury | V6 | 125 | 2-Stroke | 96148A8 | Serial 2314956–2839368 | |
| Mercury | V6 | 135 | 2-Stroke | 1990 | 96148A8 | Black Max |
| Mercury | V6 | 140 | 2-Stroke | 96148A8 | Serial 3293234 and up | |
| Mercury | V6 | 150 | 2-Stroke | 2014 | 96148A8 / 96148Q8 | Pro XS; serial 2B113483 |
| Mercury | V6 | 175 | 2-Stroke | 96148A8 | Serial 4301235 and up | |
| Mercury | V6 | 200 | 2-Stroke | 96148A8 | Serial 4839034 and up; not V-200 DFI 3.0L | |
| Mercury | V6 | 220 | 2-Stroke | 96148A8 | Serial OB117316 and up |
The kit is also listed for the following MerCruiser stern-drive applications:
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Pre-Alpha | 1970–1983 | 96148A8 | |
| MerCruiser | Alpha One | 1983–1990 | 96148A8 | Gen 1 drives |
| MerCruiser | I | 96148A8 | Serial 2495186–0D469858 | |
| MerCruiser | R | 96148A8 | Serial 2495186–0D469858 | |
| MerCruiser | MR | 96148A8 | Serial 2495186–0D469858 |
Technical Specifications
- Product Type
- Water pump impeller kit with housing
- Installation
- Direct replacement
- Housing Material
- Nylon PA66 plastic
- Impeller Material
- Neoprene rubber
- Impeller Configuration
- Short-vane design
- Weight
- 330 g (0.73 lb)
- OEM Part Numbers
- Mercury 96148A8, 96148Q8, 46-96148A8, and 46-96148Q8
What's in the Box
- 1 × Water pump housing: 46-48743A1, 46-96148, or 46-96148A1
- 1 × Impeller: 47-30221, 47-65960, or 47-85460
- 1 × Water pump housing bushing: 26-29677
- 1 × Water tube guide: 23-29804 or 23-29804T
- 1 × Seal ring gasket: 26-45577 or 26-455771
- 1 × Impeller plate: 30605
- 2 × Drain screw gasket: 191833
- 5 × O-ring: 25-30271, 25-896523, or 25-27018
- 1 × Slinger rubber ring: 25-30271
- 1 × Cup
- 5 × Water pump gasket: 27-32438, 27-30603, or 27-30604
Installation Notes
- Disconnect the battery and make sure the engine is switched off and cool.
- Remove the lower unit or gearcase from the midsection. Disconnect the shift linkage if required by the engine design.
- Place the lower unit on a stable workbench and remove the water pump housing fasteners.
- Remove the old housing, impeller, gaskets, and wear plate. Clean all mating surfaces thoroughly.
- Install the new wear plate, gaskets, and impeller in the housing. Orient the impeller vanes for the correct direction of shaft rotation.
- Apply a suitable lubricant to the inside of the housing and slide it over the impeller while turning the driveshaft in the correct direction to seat the vanes.
- Secure the housing and tighten the fasteners to the engine manufacturer's specification.
- Reinstall the lower unit, reconnect the shift linkage, and ensure the water tube is correctly aligned with the pump outlet.
- Secure the lower-unit bolts and test the engine in an appropriate water source. Confirm that cooling water exits the tell-tale outlet.
Troubleshooting and FAQ
How do I confirm that this impeller kit fits my engine?
Match the complete engine model and serial number with the compatibility tables, then compare the existing pump housing and impeller configuration with the product details. This kit is intended for applications using a short-vane impeller. If the housing or impeller differs, confirm fitment before ordering.
What is the difference between Mercury 96148A8 and 96148Q8?
Both references are listed for this water pump impeller kit application. The suffix identifies the applicable Mercury or Quicksilver distribution reference. Confirm the application by engine model, serial number, and pump configuration rather than by the suffix alone.
When should a water pump impeller be replaced?
Inspect the impeller regularly and replace it if the vanes are cracked, hardened, permanently bent, damaged, or showing signs of wear. Service intervals may need to be shortened when the engine is used in saltwater, sandy water, or silty conditions.
What are common signs of a failing impeller?
Typical signs include a weak or missing tell-tale stream, an overheating warning, elevated operating temperature, or visible damage to the impeller. Stop the engine and investigate if cooling-water flow is inadequate.
Why can an engine overheat after the impeller has been replaced?
Check for blocked water-intake screens, a restricted tell-tale outlet, a faulty thermostat, debris in the cooling passages, incorrect impeller orientation, damaged gaskets, or an incorrectly seated water tube. Verify the complete water-pump installation before operating the engine.
Is this kit for a short-vane or long-vane impeller?
This kit is for a short-vane impeller configuration. Short- and long-vane impellers are not interchangeable unless the complete pump application specifies that configuration.
Is this an OEM part?
This is an aftermarket replacement kit. The listed Mercury, Sierra, and GLM numbers are reference or interchange numbers and are provided for application identification; the product is not represented as a genuine OEM Mercury component.
How quickly is the product shipped?
Standard delivery and available expedited options are shown at checkout. Transit time varies by destination, service level, customs processing, and carrier conditions.
What is the warranty and return policy?
Warranty and return eligibility are governed by the applicable store policy. Contact support with the order details before returning a product or reporting a manufacturing issue.
Safety and Important Information
- Verify the engine model, serial number, pump housing, and impeller configuration before purchase.
- Do not operate an engine without confirming adequate cooling-water flow.
- This is an aftermarket replacement component, not a genuine OEM part.
- Professional installation is recommended when you are not familiar with lower-unit or water-pump service.
About Sea Sierra
- Marine Replacement Parts — Replacement components for common marine service and repair applications.
- Application-Focused Support — Use model, serial-number, and component information to help confirm fitment.
- Practical Value — Aftermarket service parts designed to provide a practical replacement option for maintenance and repair.
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