Water Pump Impeller – Fits Yamaha 9.9-15 HP (Replaces 63V-44352-01-00)
Water Pump Impeller – Fits Yamaha 9.9-15 HP (Replaces 63V-44352-01-00) is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller – Fits Yamaha 9.9-15 HP (Replaces 63V-44352-01-00)
Water Pump Impeller – Fits Yamaha 9.9-15 HP (Replaces 63V-44352-01-00) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Yamaha 9.9-15 HP Outboard (Replaces 63V-44352-01-00) is engineered for Yamaha 9.9-15 HP outboard motors, including both 2-stroke and 4-stroke models manufactured between 1984 and 2015.
It is a direct interchange for Yamaha part numbers 63V-44352-01-00, 63V-44352-02-00, and 63V-44352-00-00, as well as aftermarket equivalents including Sierra 18-3040, Mallory 9-45607, CEF 500320, and Quicksilver 8M6010335.
- Installation requires replacing the old impeller inside the lower unit’s water pump assembly.
- Constructed from durable neoprene rubber with a hardened nylon hub for longevity in marine environments.
- Recommended for replacement annually or every 100 hours of operation to ensure reliable engine cooling.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 63V-44352-01-00 |
| Yamaha | 63V-44352-02-00 |
| Yamaha | 63V-44352-00-00 |
| Sierra | 18-3040 |
| Mallory | 9-45607 |
| CEF | 500320 |
| Quicksilver | 8M6010335 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha engines, this impeller fits a range of 2-stroke and 4-stroke models between 9.9 and 15 HP manufactured from 1984 to 2015.
For Mercury/Mariner engines, it is listed as compatible with 9.9C and 15C 2-stroke models. Please verify specifications against your existing part, as fitment data can vary.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F9.9 | 9.9 | 4-Stroke | 1984–2005 | 63V-44352-01-00 | |
| Yamaha | FT9.9 | 9.9 | 4-Stroke | 1985–1990 | 63V-44352-01-00 | |
| Yamaha | T9.9 | 9.9 | 4-Stroke | 1985–2005 | 63V-44352-01-00 | |
| Yamaha | F15 | 15 | 4-Stroke | 1998–2015 | 63V-44352-01-00 | |
| Yamaha | 9.9 | 9.9 | 2-Stroke | 1984–1995 | 63V-44352-01-00 | |
| Yamaha | 15 | 15 | 2-Stroke | 1984–1995 | 63V-44352-01-00 | |
| Mercury/Mariner | 9.9C | 9.9 | 2-Stroke | All years | 47-84027M/47-84027T/47-96619M | |
| Mercury/Mariner | 15C | 15 | 2-Stroke | All years | 47-84027M/47-84027T/47-96619M |
Technical Specs
- Product Type
- Outboard Water Pump Impeller
- Installation
- Replace impeller within lower unit water pump assembly
- Material
- Neoprene rubber with hardened nylon hub
- Number of Blades
- 6
- Dimensions
- Height: 17.76-22.0 mm (0.70-0.87 in)
External Diameter: 40.0-40.89 mm (1.57-1.61 in)
Hub/Shaft Insert Diameter: 11.58-13.0 mm (0.46-0.51 in) - Weight
- 12g (0.35 oz)
- Recommended Maintenance
- Per owner's manual; generally annually or every 100 hours
What’s in the Box
- 1 x Impeller (63V-44352-01-00)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unbolting it from the engine's midsection.
- Locate and unbolt the water pump housing cover.
- Remove the old impeller, noting the rotational direction of the fins.
- Clean the housing and install the new impeller, applying a light coat of marine grease to the fins and using a twisting motion in the correct rotational direction to seat the blades.
- Replace the housing cover and reassemble the lower unit to the engine, ensuring all bolts are tightened to the manufacturer's torque specifications.
- Reconnect the battery and test the cooling system at a safe idle speed, confirming a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I confirm this impeller fits my engine?
First, check the Engine & Model Compatibility table on this page. For 100% certainty, compare the part number (63V-44352-01-00) and specifications listed here against your existing impeller or service manual. Visual comparison is also highly recommended.
What are the signs of a failing impeller?
A weak, sputtering, or non-existent stream of water from the tell-tale (peephole) outlet is the most common sign. Other indicators include an engine overheating alarm or steam from the exhaust. Do not run the engine if you suspect a cooling system failure.
How often should I replace my water pump impeller?
Most manufacturers recommend replacing the impeller every 100-200 operating hours or at least once per year, whichever comes first. This is critical preventative maintenance to avoid overheating, especially if you operate in saltwater or silty/sandy conditions.
Is this part difficult to install?
For those with mechanical experience, the process is straightforward. However, it requires removing the lower unit. Common challenges include dealing with a heavy lower unit and correctly seating the new impeller blades inside the housing without damage. If you are not comfortable with this process, professional installation is recommended.
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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