Water Pump Impeller – Fits Yamaha, Mercury/Mariner 9.9/15 HP (Replaces 682-44352-00-00, 47-96619M)
Water Pump Impeller – Fits Yamaha, Mercury/Mariner 9.9/15 HP (Replaces 682-44352-00-00, 47-96619M) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller – Fits Yamaha, Mercury/Mariner 9.9/15 HP (Repla...
Water Pump Impeller – Fits Yamaha, Mercury/Mariner 9.9/15 HP (Replaces 682-44352-00-00, 47-96619M) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller with Key – Fits Yamaha 9.9/15 HP 2/4-Stroke Outboards (Replaces 682-44352-00-00) is designed for reliable performance in Yamaha 9.9/15 HP 2-Stroke (1984–2008) and 9.9/15 HP 4-Stroke (up to 2000) models. It also fits various Mercury and Mariner 9.9/15 HP outboard motors as a direct replacement.
This part is a direct replacement for Yamaha 682-44352-00-00, 682-44352-01-00, and 682-44352-02-00; Sierra 18-3074; Mercury 47-96619M and 47-84027M; CEF 500320; and Mallory 9-45605.
- Engineered for direct OEM replacement fit and function.
- Constructed from durable, high-performance neoprene for longevity.
- Includes the drive key for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number | Notes |
|---|---|---|
| Yamaha | 682-44352-00-00 | Superseded by 682-44352-01-00 |
| Yamaha | 682-44352-01-00 | Superseded by 682-44352-02-00 |
| Yamaha | 682-44352-02-00 | Current OEM number |
| Sierra | 18-3074 | Aftermarket cross-reference |
| Mercury / Mariner | 47-96619M | OEM cross-reference |
| Mercury / Mariner | 47-84027M | OEM cross-reference |
| CEF Marine | 500320 | Aftermarket cross-reference |
| Mallory | 9-45605 | Aftermarket cross-reference |
| HeuroFosh | 18-3074 | Aftermarket cross-reference |
Engine & Model Compatibility
Confirm your engine model and year in the tables below for an accurate fit.
For Yamaha outboards: Fits 9.9D and 15D 2-Stroke models from 1984 to 2008, and F9.9/F15 4-Stroke models up to the year 2000.
For Mercury/Mariner outboards: Serves as a replacement for part numbers 47-96619M and 47-84027M on various 9.9 HP and 15 HP models. Due to wide variations, please verify compatibility with your specific model before ordering.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 9.9D | 9.9 | 2-Stroke | 1984–2008 | 682-44352-00-00 | Later superseded by 682-44352-01-00 |
| Yamaha | 15D | 15 | 2-Stroke | 1984–2008 | 682-44352-00-00 | Later superseded by 682-44352-01-00 |
| Yamaha | F9.9 | 9.9 | 4-Stroke | Up to 2000 | 682-44352-00-00 | Older models only |
| Yamaha | F15 | 15 | 4-Stroke | Up to 2000 | 682-44352-00-00 | Older models only |
| Mercury | 9.9 | 9.9 | 2 & 4-Stroke | Various | 47-96619M | Also 47-84027M |
| Mercury | 15 | 15 | 2 & 4-Stroke | Various | 47-96619M | Also 47-84027M |
| Mariner | 9.9 | 9.9 | 2 & 4-Stroke | Various | 47-96619M | Also 47-84027M |
| Mariner | 15 | 15 | 2 & 4-Stroke | Various | 47-96619M | Also 47-84027M |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Material
- Neoprene
- Color
- Black
- Overall Diameter
- 40 mm (1.57 in)
- Hub Diameter
- 11.9 mm (0.47 in)
- Height
- 18 mm (0.71 in)
- Weight
- 14 g (0.5 oz)
- Internal Shaft Diameter
- 11.9 mm (0.47 in)
- Number of Blades
- 6
- Key Included
- Yes
What’s in the Box
- 1 x Water Pump Impeller (replaces 682-44352-00-00)
- 1 x Key (replaces 90280-03024)
Installation Notes
- Disconnect the battery and spark plug leads for safety.
- Place the outboard in neutral gear and remove the lower unit (gearcase) bolts.
- Carefully lower the gearcase to access the water pump housing.
- Remove the water pump housing bolts and lift the housing to expose the impeller.
- Note the rotational direction of the old impeller vanes before removing it.
- Remove the old impeller, key, and gaskets. Clean all mating surfaces thoroughly.
- Install the new key in the driveshaft keyway.
- Slide the new impeller onto the driveshaft, rotating it in the direction of engine operation to bend the vanes correctly.
- Reinstall the water pump housing with new gaskets and tighten bolts to the manufacturer's specified torque.
- Reattach the lower unit to the outboard, ensuring the driveshaft and shift shaft align properly.
- Once assembled, test the engine using a water source (flushing muffs or in water) to confirm a strong, steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this impeller will fit my engine?
First, check the Engine & Model Compatibility table on this page. Second, cross-reference your existing part number with those in our Part Number Matrix. If you are still unsure, especially with Mercury/Mariner models, we recommend visually comparing your old impeller with our product images and dimensions before purchasing.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or intermittent water stream from the "tell-tale" outlet, the engine overheating alarm sounding, or visible steam from the exhaust. Brittle, cracked, or missing vanes on the old impeller are clear indicators it needs replacement.
How often should I replace my outboard's impeller?
As a preventative maintenance measure, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. For engines used in saltwater or sandy/silty conditions, annual replacement is strongly advised.
Why did my new impeller get damaged soon after installation?
Premature failure is often caused by running the engine dry, even for a few seconds, which can burn the neoprene vanes. It can also result from debris in the cooling system or incorrect installation (e.g., vanes pointing the wrong direction).
Is this part identical to the original OEM version?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It is made from high-quality neoprene, just like many original parts, to ensure reliable performance.
Does this impeller fit newer Yamaha 4-Stroke models (post-2000)?
No, this specific impeller is only listed for Yamaha F9.9 and F15 4-stroke models manufactured up to the year 2000. Newer models may use a different part number.
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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