Water Pump Impeller – Fits Mercury/Honda 30-300 HP (Replaces 47-43026Q02, 19210-ZW1-303)
Water Pump Impeller – Fits Mercury/Honda 30-300 HP (Replaces 47-43026Q02, 19210-ZW1-303) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Mercury/Honda 30-300 HP (Replaces 47-430...
Product Details
This aftermarket Water Pump Impeller – Fits Mercury/Honda 30-300 HP (Replaces 47-43026Q02) is engineered for a wide range of Mercury Marine/MerCruiser (30–300 HP, including Optimax 75–115 HP) and Honda Marine (75–90 HP, BF series) outboard engines. It ensures reliable cooling performance for 2-stroke and 4-stroke models.
It serves as a direct replacement for multiple part numbers, including Mercury 47-43026Q02, 43026T2, 430261, 430262, 430264, 43026B2, 8M002570; Honda 19210-ZW1-303, 19210-ZW1-003; OMC 0775467; Sierra 18-3056; GLM 89630; and CEF 500301.
- Designed for direct, hassle-free installation.
- Comes with the necessary drive key.
- Restores cooling system efficiency to prevent overheating.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026Q02 |
| Mercury | 43026T2 |
| Mercury | 430261 |
| Mercury | 430262 |
| Mercury | 430264 |
| Mercury | 43026B2 |
| Mercury | 8M002570 |
| Honda | 19210-ZW1-303 |
| Honda | 19210-ZW1-003 |
| OMC | 0775467 |
| Sierra | 18-3056 |
| GLM | 89630 |
| CEF | 500301 |
Engine & Model Compatibility
Confirm your engine model and specifications in the tables below.
For Mercury and MerCruiser engines, this impeller fits a broad range of 2-stroke and 4-stroke outboards from 30 HP to 300 HP, along with specific sterndrive models. Verify your model series for a match.
For Honda engines, compatibility is confirmed for BF75AT and BF90AT 4-stroke models.
| Brand | Model | Rated HP | Stroke | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Mercury | Optimax | 75-115 | 2-Stroke | 47-43026Q02 | |
| Mercury | 4-Stroke | 75-150 | 4-Stroke | 47-43026Q02 | |
| Mercury | Various | 30-300 | 2 & 4-Stroke | 47-43026Q02 | |
| MerCruiser | Alpha One Gen II | N/A | N/A | 47-43026Q02 | Sterndrive application (Serial # 0D469859 and up) |
| Honda | BF75AT | 75 | 4-Stroke | 19210-ZW1-303 | |
| Honda | BF90AT | 90 | 4-Stroke | 19210-ZW1-303 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct Replacement
- Dimensions
- A: 22.40 mm, B: 89.00 mm, C: 32.50 mm
- Weight
- 0.13 kg (0.28 lb)
- Other Technical Attributes
- Key included
What’s in the Box
- 1 x Water Pump Impeller (47-43026Q02)
Installation Notes
- Disconnect the battery and disable the ignition system for safety.
- Drain the lower unit gear oil.
- Remove the propeller and lower unit (gearcase) asembly.
- Locate and unbolt the water pump housing.
- Lift the housing to expose the old impeller. Note its rotational orientation.
- Remove the old impeller, key, and wear plate. Clean all surfaces thoroughly.
- Install the new wear plate and key. Slide the new impeller onto the drive shaft, twisting in the direction of engine rotation to bend the vanes correctly.
- Apply a light coat of marine grease or soap/water to the inside of the pump housing.
- Press the housing down over the impeller while turning the driveshaft clockwise.
- Secure the housing bolts to the manufacturer's specified torque.
- Reinstall the lower unit, refill the gear oil, and reattach the propeller.
- Reconnect the battery and test the engine's cooling stream at idle before use.
Troubleshooting & FAQ
How do I know if my impeller needs replacing?
Common signs of a failing impeller include a weak or non-existent water stream from the "telltale" port, engine overheating alarms, and visible damage like cracked, brittle, or missing vanes on the old impeller upon inspection.
What is the recommended replacement interval?
For optimal reliability, most engine manufacturers recommend inspecting the impeller annually and replacing it every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter in saltwater or high-sediment environments.
Will this fit my specific year and model?
This impeller is designed for a broad range of models, as listed in the compatibility table. The most reliable way to confirm fitment is to match your original part number to one of the numbers in our Part Number Matrix. If you are uncertain, please contact us with your engine's model and serial number before purchasing.
What happens if I install the impeller with the vanes bent the wrong way?
Installing the impeller with vanes bent in the opposite direction of the driveshaft's rotation can cause premature failure and severely reduced water flow, leading to engine overheating. Always pre-load the vanes in the correct rotational direction as you slide the housing over them.
Is a key always necessary for installation?
Yes. The key locks the impeller to the driveshaft, ensuring it spins correctly. Never reuse a worn or damaged key. This impeller includes a new key for proper installation.
Can I run the engine dry after installing a new impeller?
No. Never run the engine without a water supply, even for a few seconds. Dry running will instantly damage the new impeller as it relies on water for lubrication and cooling.
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.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
