Water Pump Impeller 47-8508910 8M0204712 for Mercury 18 20 25 HP 2-Stroke Outboard
Water Pump Impeller 47-8508910 8M0204712 for Mercury 18 20 25 HP 2-Stroke Outboard
Product Overview
Water pump impeller for Mercury and Mariner 18 HP, 20 HP and 25 HP two-stroke outboards, supplied as 1 x impeller with gasket. It replaces Mercury 47-8508910, 47-850893, 47-85089-10 and 47-85089-3, plus 8M0204712, 850892, 850891 and 8M0027792. The impeller measures 73.00 mm outside diameter, 12.6 mm high with a 16.00 mm hub and 6 blades. A worn impeller shows up as a weak telltale, overheating at idle, or cracked and set blades when the housing comes off.
Specifications & Attributes
| Specification | Detail |
|---|---|
| Condition | New / New with tags |
| Type | Water Pump Impeller |
| Engine Type | Mercury / Mariner two-stroke outboard |
| Horsepower Range | 18 HP - 25 HP |
| Number of Blades | 6 |
| Height | 12.6 mm |
| Outer Diameter | 73.00 mm |
| Hub Diameter | 16.00 mm |
| Country of Origin | Taiwan |
OEM Cross Reference
| Brand | OEM Part Numbers |
|---|---|
| Mercury / Mariner | 47-8508910, 47-850893, 47-85089-10, 47-85089-3 |
| Mercury (other references) | 8M0204712, 8M0024502, 850892, 850891, 85089, 8508920, 8M0027792, 47-85089T4, 47-85089T7 |
| Sierra | 18-3215 |
Compatible Engines
Fits the following Mercury and Mariner two-stroke outboards:
| Brand | HP | Stroke |
|---|---|---|
| Mercury / Mariner | 18 HP | 2-stroke |
| Mercury / Mariner | 20 HP | 2-stroke |
| Mercury / Mariner | 25 HP | 2-stroke |
What's Included
| Component | Qty |
|---|---|
| Water Pump Impeller | 1 |
| Gasket | 1 |
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 18, 20 and 25 HP two-stroke outboards
- Check the pump housing and stainless cup for scoring while it is apart
- Renew the gasket with the impeller — a reused one usually weeps
- 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.