Water Pump Impeller Repair Kit – Fits Mercury/Mariner Outboard 2–3.5 HP (Replaces 889246A16, 8M0080264)
Water Pump Impeller Repair Kit – Fits Mercury/Mariner Outboard 2–3.5 HP (Replaces 889246A16, 8M0080264) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This Water Pump Impeller Repair Kit is designed for Mercury/Mariner 4-Stroke outboard motors, including 2 HP, 2.5 HP, 3.3 HP, and 3.5 HP models. It provides all essential components for a complete service, restoring cooling system performance and preventing engine overheating.
It serves as a direct interchange for Mercury part numbers 889246A16 and 8M0080264, Yamaha 6A1-W0078-01-00, and Sierra 18-3463.
- Includes a high-performance neoprene rubber impeller for enhanced durability.
- Designed for service replacement utilizing your existing water pump housing.
- Features components made from high-quality, corrosion-resistant metal alloys suitable for marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury | 889246A16 | |
| Mercury | 8M0080264 | Supersedes 889246A16 |
| Yamaha | 6A1-W0078-01-00 | |
| Sierra | 18-3463 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model and year in the tables below.
For Mercury/Mariner, this kit is specified for 4-stroke outboard models. Please verify your engine's part number requirements.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Outboard | 2.0 | 4-Stroke | 889246A16/8M0080264 | Without housing |
| Mercury | Outboard | 2.5 | 4-Stroke | 889246A16/8M0080264 | Without housing |
| Mercury | Outboard | 3.3 | 4-Stroke | 889246A16/8M0080264 | Without housing |
| Mercury | Outboard | 3.5 | 4-Stroke | 889246A16/8M0080264 | Without housing |
For Yamaha, this kit may be used as a cross-reference for the listed 2-stroke models. Always confirm fitment against your specific service manual.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 2B | 2.0 | 2-Stroke | 1985–1988 | 6A1-W0078-01-00 | Cross-reference only |
| Yamaha | 2MSHT | 2.0 | 2-Stroke | 1995 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHW | 2.0 | 2-Stroke | 1998 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2SF | 2.0 | 2-Stroke | 1989 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHQ | 2.0 | 2-Stroke | 1992 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2SD | 2.0 | 2-Stroke | 1990 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHR | 2.0 | 2-Stroke | 1993 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHV | 2.0 | 2-Stroke | 1997 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHP | 2.0 | 2-Stroke | 1991 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHS | 2.0 | 2-Stroke | 1994 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHA | 2.0 | 2-Stroke | 2002 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHU | 2.0 | 2-Stroke | 1996 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHKZ | 2.0 | 2-Stroke | 2001 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHX | 2.0 | 2-Stroke | 1999 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHZ | 2.0 | 2-Stroke | 2001 | 6A1-W0078-02-00 | Cross-reference only |
| Yamaha | 2MSHY | 2.0 | 2-Stroke | 2000 | 6A1-W0078-02-00 | Cross-reference only |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Service replacement without housing
- Housing Material
- High-quality marine and chemical corrosion resistant metal alloy
- Dimensions
- 7.5" L x 6.0" W x 1.25" H
- Weight
- 39.3 g (1.39 oz)
- Fitting Type
- OEM fit
- Other Technical Attributes
- High performance neoprene rubber impeller
What’s in the Box
- 1 x Water Pump Impeller (161543/16154-3)
- 1 x Pin Roll Driveshaft (16155)
- 1 x Wear Plate Stainless Steel (898101371)
- 1 x Cup Liner Stainless Steel (16157)
Installation Notes
- Before starting, disconnect the engine's battery and shift into neutral.
- Remove the lower unit (gearcase) afrom the outboard motor.
- Place the lower unit on a workbench and remove the bolts securing the water pump housing.
- Carefully lift off the housing. The old impeller will be visible on the driveshaft.
- Slide the old impeller off the shaft. Remove the old wear plate, liner, and any gasket residue.
- Clean all mating surfaces thoroughly to ensure a proper seal.
- Install the new wear plate and cup liner provided in the kit.
- Align the new impeller with the driveshaft key and slide it down. Rotate the driveshaft clockwise to help seat the impeller vanes correctly within the housing cup.
- Lightly apply marine grease to the interior of the pump cup and on the impeller.
- Reinstall the water pump housing, tightening the bolts in a crisscross pattern to the manufacturer's torque specifications.
- Reattach the lower unit to the outboard motor.
- Reconnect the battery, start the engine in a water source (using flush muffs or in the water), and verify that a steady stream of water is exiting the tell-tale port.
Troubleshooting & FAQ
How do I know if this kit fits my motor?
This kit is primarily designed for Mercury/Mariner 4-Stroke outboards from 2 HP to 3.5 HP. It also cross-references to several Yamaha 2-stroke models. The best way to confirm fitment is to match your existing part number to one of the direct replacements listed in our Part Number Matrix: 889246A16, 8M0080264, 6A1-W0078-01-00, or 18-3463.
What are the signs of a failing water pump impeller?
Common signs include a weak or intermittent water stream from the tell-tale (pee hole), engine overheating alarms, or a noticeable decrease in engine performance. If you see any of these symptoms, inspect your impeller immediately.
How often should the water pump impeller be replaced?
As a general maintenance rule, it's recommended to inspect the impeller annually and replace it every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if you frequently operate in sandy or silty water.
Is the pump housing included in this kit?
No, this is a service kit that does not include the main water pump housing. It is designed to replace the internal wear components (impeller, liner, plate, etc.) within your existing housing.
Does this kit work for both 2-stroke and 4-stroke engines?
This kit is specified for Mercury/Mariner 4-Stroke models. While it shares a part number (6A1-W0078-01-00) with some Yamaha 2-Stroke engines, you must verify compatibility for your specific application, as internal tolerances can differ.
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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