Water Pump Impeller Kit 47-84797M 18-3426 for Mercury 20 25 28 30 HP Outboard
Water Pump Impeller Kit 47-84797M 18-3426 for Mercury 20 25 28 30 HP Outboard
Product Overview
Water pump impeller kit for Mercury and Mariner 20 HP, 25 HP, 28 HP and 30 HP outboards, supplied as 1 x impeller with housing, insert cup, wear plate, 2 gaskets, key, grommet, 3 bolts and 3 washers. It replaces Mercury 47-84797M, 47-81604M, 47-42431M and 47-84829M, Sierra 18-3426 and 18-3427, and Yamaha 689-W0078-A6, 689-W0078-06 and 689-W0078-05. A worn pump shows up as a weak telltale, overheating at idle, or scoring inside the housing.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Water Pump Impeller Kit |
| Engine Type | Mercury / Mariner outboard |
| Horsepower Range | 20 HP - 30 HP |
| Housing | White or black (random colour) |
| Country of Origin | Taiwan |
| Warranty | Standard |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Mercury (impeller) | 47-84797M, 47-81604M |
| Mercury (kit) | 47-42431M, 47-84829M, 47-81242M, 47-95661M, 47-97793M, 47-97793T |
| Mercury (housing) | 47-95651M |
| Mercury (wear plate) | 47-95659M |
| Mercury (insert cup) | 47-95652M |
| Sierra | 18-3426, 18-3427 |
| Yamaha | 689-W0078-A6, 689-W0078-06, 689-W0078-05 |
| Yamaha (impeller) | 689-44352, 689-44352-03 |
| Yamaha (insert cup) | 689-44322 |
Compatible Engines
Fits the following Mercury and Mariner outboards:
| Brand | HP |
|---|---|
| Mercury / Mariner | 20 HP |
| Mercury / Mariner | 25 HP |
| Mercury / Mariner | 28 HP |
| Mercury / Mariner | 30 HP |
What's Included
| Component | Qty |
|---|---|
| Water Pump Impeller | 1 |
| Water Pump Housing | 1 |
| Insert Cup | 1 |
| Wear Plate | 1 |
| Pump Gasket | 2 |
| Impeller Key | 1 |
| Grommet Seal (lower) | 1 |
| Bolt | 3 |
| Washer | 3 |
Condition & Warranty
| Item | Detail |
|---|---|
| Condition | New / New with tags |
| Warranty | Standard |
| Packaging | Sealed retail packaging |
Before You Buy
- Verify your engine model and serial number before ordering
- Fits Mercury and Mariner 20, 25, 28 and 30 HP outboards
- This kit includes the housing — check your old housing for scoring first
- Housing colour is random (white or black); both are the same part
- 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.