Water Pump Impeller Kit – Fits Mercury/Mariner 65-220HP & MerCruiser Alpha One (Replaces 46-96148A8, 46-96148Q8, 46-96148T8)
Water Pump Impeller Kit – Fits Mercury/Mariner 65-220HP & MerCruiser Alpha One (Replaces 46-96148A8, 46-96148Q8, 46-96148T8) 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 – Fits Mercury/Mariner 65-220HP & MerCr...
Product Details
This complete Water Pump Impeller Kit provides everything needed for a full service of the lower unit water pump on a wide range of Mercury/Mariner outboards and MerCruiser sterndrives. It is designed for Mercury/Mariner 65–220HP 2-stroke models (4-cylinder through V6 with short-vane impellers) and MerCruiser Pre-Alpha (1970–1983), Alpha One (1983–1990), MC-1, R, and MR drives with serial numbers between 2491586 and 0D469858.
This kit is a direct interchange for Mercury part numbers 46-96148A8, 46-96148Q8, and 46-96148T8, as well as Sierra 18-3217 and Quicksilver 96148Q8. It also replaces Sierra 18-3316 when a complete housing is required.
- Engineered for direct-fit installation, matching OEM specifications.
- Features a durable plastic housing and a high-performance neoprene impeller.
- Includes the impeller, housing, wear plate, and all necessary gaskets and seals for a comprehensive rebuild.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 46-96148A8 | Original base number. |
| Mercury / Quicksilver | 46-96148Q8 | Supersedes 46-96148A8. |
| Mercury | 46-96148T8 | Supersedes 46-96148Q8. |
| Sierra | 18-3217 | Impeller-only kit. |
| Sierra | 18-3316 | Kit with housing (like this one). |
| Quicksilver | 96148Q8 | OEM service part number. |
Engine & Model Compatibility
Confirm your engine model and serial number in the tables below. Compatibility depends on the serial number range for many models.
Mercury/Mariner Outboards: Designed for 2-stroke, 4-cylinder through V6 models equipped with short-vane impellers.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Outboard | 65 | 2-Stroke | 46-96148A8 | 4-Cylinder, Serial # 1542745–3293183 |
| Mercury | Outboard | 70 | 2-Stroke | 46-96148A8 | 4-Cylinder, Serial # 1503959–1566239 |
| Mercury | Outboard | 75 | 2-Stroke | 46-96148A8 | 4-Cylinder, Serial # 6432901 & Up |
| Mercury | Outboard | 80 | 2-Stroke | 46-96148A8 | Serial # 2559001–6432900 |
| Mercury | Outboard | 85 | 2-Stroke | 46-96148A8 | Serial # 1566240–4861998 |
| Mercury | Outboard | 90 | 2-Stroke | 46-96148A8 | Serial # 1766824 & Up |
| Mercury | Outboard | 100 SS | 2-Stroke | 46-96148A8 | Serial # 1503332–2836018 |
| Mercury | Outboard | 110 | 2-Stroke | 46-96148A8 | Serial # 1870204–2314955 |
| Mercury | Outboard | 115 | 2-Stroke | 46-96148A8 | 6-Cylinder, Serial # 2836019 & Up |
| Mercury | Outboard | 125 | 2-Stroke | 46-96148A8 | Serial # 2314956–2839368 |
| Mercury | Outboard | 135 | 2-Stroke | 46-96148A8 | Serial # 2839369–3293233 |
| Mercury | Outboard | 140 | 2-Stroke | 46-96148A8 | Serial # 3293234 & Up |
| Mercury | Outboard | 150 | 2-Stroke | 46-96148A8 | Serial # 3502806 & Up |
| Mercury | Outboard | 175 | 2-Stroke | 46-96148A8 | Serial # 4301235 & Up |
| Mercury | Outboard | 200 | 2-Stroke | 46-96148A8 | Serial # 4839034 & Up, not including V-200 DFI 3.0L |
| Mercury | Outboard | 220 | 2-Stroke | 46-96148A8 | Serial # OB117316 & Up |
MerCruiser Sterndrives: Fits Pre-Alpha, Alpha One, MC-1, R, and MR models within the specified serial number ranges.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | Pre-Alpha | 1970–1983 | 46-96148A8 | Serial # 2491586 through 0D469858 |
| MerCruiser | Alpha One | 1983–1990 | 46-96148A8 | Serial # 2491586 through 0D469858 |
| MerCruiser | MC-1 | 46-96148A8 | ||
| MerCruiser | R Drive | 46-96148A8 | ||
| MerCruiser | MR Drive | 46-96148A8 |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Direct Replacement
- Materials
- Plastic (Housing), Neoprene (Impeller)
- Impeller Design
- Short-vane
- Weight
- 0.37 kg (0.8 lb)
What’s in the Box
- 1 x Water Pump Impeller (47-89984T4)
- 1 x Pump Housing Assembly (46-96148A1)
- 1 x Wear Plate (32435)
- 1 x Water Tube Gasket (23-29804)
- 1 x Grommet (26-38970)
- 1 x Face Seal (26-45577)
- 7 x Assorted Gaskets (27-42631-1, 26-20260, 12-19183, 27-85610-1, 27-85608-1, 27-85609-1, 27-32438)
Installation Notes
- Disconnect Power: Disconnect the battery and shift the outboard into neutral gear.
- Drain Gearcase: Place a drain pan under the lower unit and remove the drain/fill plugs to empty the gearcase oil.
- Remove Lower Unit: Loosen and remove the bolts securing the lower unit (gearcase) to the engine's midsection. Carefully separate the lower unit.
- Access the Pump: With the lower unit removed, locate and unbolt the water pump housing.
- Replace Components: Remove the old impeller, housing, wear plate, and gaskets. Clean all mating surfaces thoroughly.
- Install New Kit: Install the new components in reverse order. Lightly grease the new impeller and insert it while turning the driveshaft clockwise to bend the vanes correctly.
- Reassemble: Reinstall the water pump housing, ensuring all seals and gaskets are correctly seated. Torque bolts to manufacturer specifications.
- Reattach Lower Unit: Guide the lower unit back into place, ensuring the driveshaft, shift shaft, and water tube align. Secure with bolts.
- Refill and Test: Refill the gearcase with fresh oil. Reconnect the battery. Start the engine using a water supply (flushing muffs) and check for a steady stream of water from the tell-tale port.
Troubleshooting & FAQ
How do I confirm this kit fits my specific engine?
The most reliable method is to match your engine's model and serial number to the ranges listed in the compatibility tables above. Serial numbers are critical for Mercury/MerCruiser fitment, so be sure to verify them on your engine or drive.
What are the signs of a failing water pump impeller?
Common symptoms include the engine overheating at idle or low speeds, a weak or non-existent water stream from the "tell-tale" outlet, or a high temperature warning alarm. Visual inspection may reveal cracked, brittle, or broken impeller vanes.
How often should I replace my water pump impeller?
As a general maintenance guideline, it is recommended to replace the impeller annually or every 100 hours of operation, whichever comes first. This interval may be shorter if you operate primarily in saltwater or sandy/silty conditions.
What is the benefit of a kit with the housing vs. an impeller-only kit?
This kit includes both the impeller and the housing assembly. Over time, the inside of the housing can become scored or warped from debris and heat, reducing pump efficiency even with a new impeller. Replacing the complete assembly ensures optimal sealing and water pressure.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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