Water Pump Impeller Kit for Mercury Marine and MerCruiser 65–225 HP 2-Stroke Applications – Replaces 46-96148A8 and 46-96148Q8
Water Pump Impeller Kit for Mercury Marine and MerCruiser 65–225 HP 2-Stroke Applications – Replaces 46-96148A8 and 46-96148Q8 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
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Water Pump Impeller Kit for Mercury Marine and MerCruiser 65–225 HP...
Water Pump Impeller Kit for Mercury Marine and MerCruiser 65–225 HP 2-Stroke Applications – Replaces 46-96148A8 and 46-96148Q8 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller kit is designed for servicing the cooling systems of selected Mercury Marine 2-stroke outboards and MerCruiser sterndrives. It is listed for Mercury 65–225 HP applications and MerCruiser Pre-Alpha, Alpha One, I, R, and MR sterndrives within the applicable model and serial-number ranges below.
The kit provides replacement coverage for Mercury part numbers 46-96148A8, 46-96148Q8, and 46-96148T8, with additional aftermarket references including Sierra 18-3517 and GLM 12280. Always compare the original pump components, engine model, and serial number before ordering.
- Replacement water-pump service kit for specified Mercury and MerCruiser applications.
- Includes a nylon PA66 water-pump housing and neoprene rubber impeller.
- Uses a short-vane impeller design for the listed applications.
- Supplied with the gaskets, seals, guides, bushings, and related service components listed below.
Part Number Matrix
Use the following references to compare the listed OEM and aftermarket numbers with the component being replaced.
| Brand | Part Number |
|---|---|
| Mercury | 46-96148A8 |
| Mercury | 46-96148Q8 |
| Mercury | 46-96148T8 |
| Quicksilver | 96148A8 |
| Sierra | 18-3517 |
| GLM | 12280 |
Engine and Model Compatibility
Compatibility depends on the complete engine model and serial-number range. Confirm both details before installation. The following applications are the listed fitment references for this kit.
| Brand | Model | Rated HP | Stroke | Serial Number | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 4-cylinder | 65 | 2-Stroke | 1542745–3293183 | 46-96148A8 | |
| Mercury | 4-cylinder | 70 | 2-Stroke | 1503959–1566239 | 46-96148A8 | |
| Mercury | 4-cylinder | 75 | 2-Stroke | 6432901 and up | 46-96148A8 | |
| Mercury | 4-cylinder | 80 | 2-Stroke | 2559001–6432900 | 46-96148A8 | |
| Mercury | 4-cylinder | 85 | 2-Stroke | 1566240–4861998 | 46-96148A8 | |
| Mercury | 4-cylinder | 90 | 2-Stroke | 1766824 and up | 46-96148A8 | |
| Mercury | SS | 100 | 2-Stroke | 1503332–2836018 | 46-96148A8 | |
| Mercury | 6-cylinder | 110 | 2-Stroke | 1870204–2314955 | 46-96148A8 | |
| Mercury | 6-cylinder | 115 | 2-Stroke | 2836019 and up | 46-96148A8 | |
| Mercury | 6-cylinder | 125 | 2-Stroke | 2314956–2839368 | 46-96148A8 | |
| Mercury | 6-cylinder | 135 | 2-Stroke | 2839369–3293233 | 46-96148A8 | |
| Mercury | 6-cylinder | 140 | 2-Stroke | 3293234 and up | 46-96148A8 | |
| Mercury | 6-cylinder | 150 | 2-Stroke | 3502806 and up | 46-96148A8 | |
| Mercury | 6-cylinder | 175 | 2-Stroke | 4301235 and up | 46-96148A8 | |
| Mercury | 6-cylinder | 200 | 2-Stroke | 4839034 and up | 46-96148A8 | Not including V-200 DFI 3.0L |
| Mercury | 6-cylinder | 220 | 2-Stroke | OB117316 and up | 46-96148A8 |
For MerCruiser sterndrives, the listed applications include Pre-Alpha units from 1970–1983 and Alpha One, I, R, and MR units from 1983–1990. Confirm the serial number, particularly when identifying Alpha One units.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Pre-Alpha | 1970–1983 | 46-96148A8 | |
| MerCruiser | Alpha One | 1983–1990 | 46-96148A8 | Fits S/N 2495186–0D469858 |
| MerCruiser | I, R, and MR | 1983–1990 | 46-96148A8 | Fits S/N 2495186–0D469858 |
Exclusion: Alpha One Gen II drives require a different water-pump kit.
Technical Specifications
- Product Type
- Water pump impeller kit
- Installation
- Direct replacement
- Housing Material
- Nylon PA66 plastic water-pump housing
- Impeller Material
- Neoprene rubber
- Housing Color
- Black
- Impeller Design
- Short-vane design
- Dimensions
- 150 mm × 104 mm × 81 mm (5.91 in × 4.09 in × 3.19 in)
- Weight
- 330 g (11.6 oz)
- Country of Origin
- Taiwan
- Warranty
- 1 year
What's in the Box
- 1 × Water-pump housing — replaces 46-48743A1, 46-96148, and 46-96148A1
- 1 × Impeller — replaces 47-30221, 47-65960, and 47-85460
- 1 × Cup
- 1 × Impeller plate — replaces 30605
- 1 × Water-tube guide — replaces 23-29804 and 23-29804T
- 1 × Seal-ring gasket — replaces 26-45577 and 26-455771
- 2 × Water-pump housing bushings — replaces 26-29677
- 1 × Slinger rubber ring — replaces 25-30271
- 5 × O-rings — replaces 25-30271, 25-896523, and 25-27018
- 5 × Water-pump gaskets — replaces 27-32438, 27-30603, and 27-30604
- 2 × Drain-screw gaskets — replaces 191833
Installation Notes
- Disconnect the battery and remove the engine cover.
- Shift the engine into forward gear if required to simplify driveshaft re-engagement.
- Remove the bolts securing the lower unit to the engine leg, then carefully lower the unit.
- Remove the old water-pump housing assembly from the driveshaft and note the orientation of each component.
- Clean the mating surfaces on the gearcase and driveshaft.
- Install the base gaskets and impeller wear plate according to the original assembly.
- Slide the new impeller onto the driveshaft, rotating the shaft in the correct direction so the vanes are properly oriented.
- Install the housing, seals, guides, and remaining components supplied in the kit.
- Tighten the housing fasteners to the manufacturer's specified torque.
- Apply appropriate marine grease to the driveshaft splines and reinstall the lower unit, ensuring that the water tube and shift shaft align.
- Reconnect the battery and test the engine in water. Confirm a steady tell-tale stream and normal operating temperature.
Follow the service manual for your exact engine or sterndrive when identifying fastener torque, shaft-rotation direction, and installation procedures.
Troubleshooting and FAQ
How do I confirm this fits my MerCruiser Alpha One?
Confirm that the sterndrive is an applicable Alpha One unit with a serial number from 2495186 to 0D469858. Alpha One Gen II drives and units outside this range require a different kit.
What are the symptoms of a failing impeller?
Possible signs include higher-than-normal engine temperature at idle or low speed, a weak or missing tell-tale stream, and steam from the exhaust. Stop operation if overheating is suspected.
How often should the water-pump kit be replaced?
Replacement intervals depend on operating hours, storage, water conditions, and the engine manufacturer's maintenance schedule. Many operators replace the impeller and related service parts every 1–2 years or 100–200 operating hours, whichever comes first, with more frequent inspection in saltwater use.
What is a short-vane impeller?
A short-vane impeller has a vane profile intended for the specified pump housing and applications. Using an incorrect impeller design may cause poor fit, reduced water flow, or overheating.
My engine overheated. Is replacing the impeller kit enough?
Not necessarily. If the impeller has damaged or disintegrated, inspect the cooling passages and remove any fragments. Also check the housing, wear plate, gaskets, water tube, thermostat, and other cooling-system components before returning the engine to service.
Is this an OEM component?
No. This is an aftermarket replacement kit intended for the listed applications and reference numbers. It is not manufactured by Mercury or MerCruiser.
How long does shipping take?
Typical transit is 5–15 days for standard worldwide shipping. Expedited options, where available, are shown at checkout.
What is the warranty and return policy?
This kit is covered by a 1-year warranty against manufacturing defects under normal use. Returns must comply with the applicable store policy and are generally limited to unused products in original condition.
Safety and Important Information
- Verify the engine or sterndrive model, serial number, original pump design, and replacement numbers before ordering.
- Do not rely on horsepower alone to confirm fitment.
- This is an aftermarket replacement, not an OEM component.
- Use the service manual for the exact engine or sterndrive and consider professional installation.
- After installation, verify water flow and operating temperature before normal operation.
About Sea Sierra
- Marine Replacement Parts — Replacement components for selected marine cooling-system applications.
- Global Fulfillment — Standard delivery is available to most regions, with typical transit of 5–15 days.
- Value-Focused Service Parts — Aftermarket components supplied for maintenance and repair applications.
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