Water Pump Impeller Kit 66T-W0078 with Housing for Yamaha Outboard 25 30 40 HP
Water Pump Impeller Kit 66T-W0078 with Housing for Yamaha Outboard 25 30 40 HP
Product Overview
Complete water pump impeller kit with housing for Yamaha 25, 30 and 40 HP four-stroke outboards. Replaces Yamaha 66T-W0078-00 / 66T-W0078-A0 / 66T-W0078-01 and 6H4-W0078-00 (Sierra 18-3440 / 18-3413), and supplies all 11 components of the pump — impeller, housing, cover, insert cup, plate, key, gaskets, seal, O-ring, bolts and washers — so the whole pump can be rebuilt in one job. The impeller uses hardened nylon and neoprene rubber for maximum durability and cooling efficiency.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Outboard Water Pump Impeller Repair Seal Kit |
| Engine Type | Yamaha Outboard 4-Stroke 25 / 30 / 40 HP |
| Impeller Material | Hardened nylon and neoprene rubber |
| Housing OE | 66T-44311 |
| Components | 11 pieces |
| Warranty | 3 Year |
| Country of Origin | Taiwan |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Yamaha — Kit | 66T-W0078-00, 66T-W0078-A0, 66T-W0078-01 |
| Yamaha — Kit (alt) | 6H4-W0078-00 |
| Yamaha — Impeller | 6H4-44352-02-00 |
| Yamaha — Housing | 66T-44311-00-00 |
| Sierra | 18-3440, 18-3413 |
Compatible Engines
| Horsepower | Model | Years |
|---|---|---|
| 25 HP 4-Stroke | T25 | 2001-2006 |
| 30 HP 4-Stroke | F30 | 2001-2005 |
| 40 HP 4-Stroke | F40 | 2000-2006 |
| 40 HP 4-Stroke | F40B | 2007-2008 |
What's Included
| Component | Qty |
|---|---|
| Water Pump Impeller | 1 |
| Pump Case Gasket | 1 |
| Impeller Plate | 1 |
| Impeller Key | 1 |
| Insert Cup | 1 |
| Bolt | 4 |
| Pump Housing Cover | 1 |
| O-Ring | 1 |
| Water Seal | 1 |
| Washer | 4 |
| Water Pump Housing | 1 |
Note: the water pump housing is supplied in white or black — colour is selected at random. Performance is identical.
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | 3 Year |
| Packaging | Sealed retail packaging |
Before You Buy
- Verify your engine model or serial number before ordering
- Fits Yamaha 4-stroke T25, F30, F40 and F40B outboards only
- Kit includes the housing, so no separate casting purchase is needed
- 30-Day Easy Returns
- Free Worldwide Shipping
- OEM Quality Without the Markup
Couldn't load pickup availability
Boat Owners' Review
Before You Buy
Frequently Asked Questions
What is your refund policy?
We offer a 14-day hassle-free return on all products. Items must be unused and in original packaging. Every XRmarine part is also covered by our 1-year warranty against manufacturing defects. If something is not right, email us at info@xrmarineparts.com — replacement or full refund, your choice.
See our full Refund Policy for complete details.
How does shipping work?
Free international shipping on every order — no minimums. We operate a global warehouse network with a main distribution centre in Asia (10-20 business days). We also hold stock in regional warehouses across the United States, Germany, the United Kingdom, Australia, and Poland (opening soon) — most orders arrive in 1-3 business days within those countries and in 2-8 business days to nearby regions. Tracking included.
See our full Shipping Policy.
How do you keep prices fair?
We cut out the middlemen. XRmarine sources directly from quality manufacturers and sells at honest prices. Same OEM-quality parts, no dealership markup. Every order comes with free shipping, real expert support, and a 1-year warranty.
Learn more on our About Us page.
What payment methods do you accept?
We currently accept PayPal — a fast, secure way to pay online. Credit card payments (Visa, Mastercard, American Express) and Shopify Payments are being set up and will be available soon. We appreciate your patience.