Water Pump Impeller Kit for Mercury 3.0L DFI Outboards – Replaces Mercury 817275A5
Water Pump Impeller Kit for Mercury 3.0L DFI Outboards – Replaces Mercury 817275A5 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Water Pump Impeller Kit for Mercury 3.0L DFI Outboards – Replaces M...
Water Pump Impeller Kit for Mercury 3.0L DFI Outboards – Replaces Mercury 817275A5 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller Kit is intended for selected Mercury 3.0L DFI outboards and replaces the Mercury OEM water-pump reference 817275A5. It is designed to help restore water-pump performance during routine cooling-system service.
Because water-pump parts can vary by engine model, gearcase configuration, and serial-number range, confirm the complete engine identification before ordering. Match the model and serial-number conditions below with the identification plate on your engine.
- Product type: Aftermarket water-pump impeller kit
- Primary OEM reference: Mercury 817275A5
- Application: Selected Mercury 3.0L DFI and EFI outboards listed below
- Installation: Replacement service part for the original water-pump assembly
Part Number References
The following references are associated with this product in the available product-number records. Reference numbers are provided for identification and should not be treated as universal fitment confirmation without matching the engine model and serial number.
| Brand or reference type | Part number |
|---|---|
| Mercury OEM | 817275A5 |
| Mercury reference | 847275A5 |
| Sierra reference | 18-3147 |
| GLM reference | 89630 |
| Mallory reference | 9-48315 |
| Recmar reference | REC817275Q05 |
| EMP reference | 46-46502 |
Engine Compatibility
The catalog occurrences available for Mercury OEM reference 817275A5 identify the following model and serial-number applications. The catalog records do not establish a single year range or a universal application across all Mercury 3.0L engines.
| Brand | Model | Engine description | Serial-number condition | OEM reference |
|---|---|---|---|---|
| Mercury | 200 DFI | 3.0L DFI outboard; standard or counter rotation catalog diagrams | 0G590000 through 0G760299 | 817275A5 |
| Mercury | 225 DFI | 3.0L DFI outboard; standard or counter rotation catalog diagrams | 0G590000 through 0G760299 | 817275A5 |
| Mercury | 225 Pro XS | 3.0L DFI outboard; TorqueMaster gear-housing application | 1B104549 through 1B426560 | 817275A5 |
| Mercury | 250XB | 3.0L EFI outboard; standard-rotation gear-housing application | 0G980600 through 0T800999 | 817275A5 |
Important: The model, serial-number range, rotation or gearcase condition must be considered together. A matching horsepower rating by itself is not sufficient to confirm fitment.
Technical Information
- Product type
- Water pump impeller kit
- Part classification
- Aftermarket replacement part
- Primary OEM reference
- Mercury 817275A5
- Application
- Selected Mercury 3.0L DFI and EFI outboards listed in the compatibility table
- Installation
- Service replacement for the original water-pump components; follow the engine manufacturer’s service procedure
What’s in the Box
This listing is for a water-pump impeller kit. The available product records do not provide a verified item-by-item package list or confirm that a complete upper or lower pump housing is included. Inspect the supplied parts before installation and compare them with the original assembly.
Installation Notes
- Confirm the engine model, serial number, gearcase configuration, and original water-pump reference before beginning work.
- Disconnect the battery and follow the manufacturer’s procedure for removing the lower unit.
- Disassemble the water-pump components and retain the original parts until the replacement components have been compared.
- Inspect the pump housing, wear plate, key, water tube, and mating surfaces for scoring, cracks, corrosion, or distortion. Replace damaged parts as required.
- Clean all mating surfaces and install the supplied replacement components in the correct order.
- Lubricate and orient the impeller according to the engine manufacturer’s service instructions. Do not force or fold the vanes against the wrong rotation direction.
- Reassemble the water pump and lower unit using the manufacturer’s specified fastener sequence and torque values.
- After installation, run the engine only in a suitable test environment and verify a steady cooling-water tell-tale stream before normal operation.
Maintenance and Troubleshooting
How do I confirm fitment?
Read the model and serial number from the engine identification plate and compare both with the compatibility table. Also compare the original water-pump reference and gearcase configuration. If any of these conditions differ, obtain confirmation before ordering.
What are common signs of water-pump service being needed?
Possible symptoms include a weak or absent tell-tale stream, overheating warnings, steam, or abnormal cooling-system performance. Stop operation if the engine overheats and diagnose the cooling system before continued use.
Does this listing include a complete water-pump housing?
The available product information identifies this item as a water-pump impeller kit but does not verify that a complete upper or lower housing is included. Review the supplied parts before installation and do not assume that housing components are included.
Is this an OEM Mercury part?
No. This is an aftermarket replacement associated with Mercury OEM reference 817275A5. Mercury is a trademark of its respective owner and is used only to identify application and reference information.
How often should the impeller be inspected?
Inspect the impeller according to the engine manufacturer’s maintenance schedule and whenever cooling-water flow is reduced or overheating occurs. Replace it if the vanes are damaged, hardened, cracked, permanently bent, or worn.
Safety and Important Information
- Verify the complete model and serial-number conditions before purchase.
- Do not rely on horsepower alone to determine compatibility.
- Use the correct service manual and manufacturer-specified torque values during installation.
- Never operate an outboard without an adequate cooling-water supply.
- Professional installation is recommended when lower-unit removal or cooling-system service is outside your experience.
About Sea Sierra
- Marine replacement parts — Practical aftermarket components for routine service and repair.
- Application-focused listings — Model and serial-number information is provided to support more accurate part selection.
- Service support — Compare the replacement part with the original assembly before installation.
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.
