Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5)
Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces ...
Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5) is backordered and will ship as soon as it is back in stock.
Product Details
This comprehensive Water Pump Rebuild Kit – Fits Mercury 3.0L DFI Outboards (Replaces 817275A5) restores your engine's cooling system to factory specifications. It is designed for Mercury 200-300 HP outboards with 3.0L DFI/EFI engines (1998–2012), including ProMax, Seapro, Marathon, and Sport XS models. It is also compatible with select Mercury Alpha One Gen 2 sterndrives.
It serves as a direct interchange for Mercury part 817275A5 and aftermarket cross-references from Sierra (18-3147), GLM (89630), Mallory (9-48315), and EMP (46-46502).
- Installation: Direct OEM replacement fit.
- Impeller Material: Neoprene rubber for enhanced saltwater resistance.
- Inclusions: Complete kit contains the impeller, housing, plate, gaskets, and seals for a full service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 847275A5 / 817275A5 |
| Sierra | 18-3147 |
| GLM | 89630 |
| Mallory | 9-48315 |
| EMP | 46-46502 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Mercury/Mariner Outboards (3.0L Engines)
| Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| 200 DFI | 200 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G590000-1B504988 |
| 200 EFI | 200 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0T750164-1B504988 |
| 225 Carb/DFI/EFI | 225 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G760300-1B504988 |
| 225 Pro XS | 225 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G760300-1B504988 |
| 225 Sport XS | 225 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G760300-1B504988 |
| 225 Seapro/Marathon | 225 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0T801000-1B417701 |
| 250 EFI | 250 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G760300-1B504988 |
| 250 XB EFI | 250 | 2-Stroke | 1998–2005 | 817275A5 | Serial: 0G980600-0T800999 |
| 250 XS / Sport XS | 250 | 2-Stroke | 1998–2012 | 817275A5 | Serial: 0G760300-1B504988 |
| 300X EFI ProMax | 300 | 2-Stroke | 1998–2009 | 817275A5 | Also called "ProMax" or "Super Magnum" |
| 300X EFI | 300 | 2-Stroke | 1998–2009 | 817275A5 | |
| JP5 3.0L DFI | - | 2-Stroke | 1998–2012 | 817275A5 | Jet drive application |
MerCruiser Stern Drives
| Model | OEM Part No. |
|---|---|
| Alpha One Gen 2 | 817275A5 |
Technical Specs
- Product Type
- Complete Water Pump Rebuild Kit
- Installation
- Direct OEM replacement
- Dimensions
- Housing Height: 31.31 mm (1.23 in)
- Weight
- 0.64 kg (1.41 lbs)
- Impeller Dimensions
- Overall Diameter: 87.92 mm (3.46 in)
Shaft Diameter: 22.25 mm (0.88 in) - Warranty
- 90 days (aftermarket parts)
- Other Technical Attributes
- Impeller made of neoprene rubber for saltwater resistance
What’s in the Box
- 1 x Impeller (47-43026T2/47-43026-2/43026Q02)
- 1 x Impeller Plate (8172761)
- 1 x Face Seal with Tool (26-816575A2)
- 1 x Impeller Key (28-43037)
- 1 x Carrier Seal (821759A4)
- 2 x O-Rings (25-21836)
- 1 x Seal Ring Gasket (26-45577B1)
- 1 x Drain Screw Gasket (12-191833)
- 2 x Impeller Gaskets (27-430331, 27-8172771)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Locate and unbolt the lower unit (gearcase) from the midsection. Carefully lower it to access the water pump.
- Remove the bolts securing the water pump housing and lift it to expose the impeller.
- Inspect the housing and wear plate for scoring, cracks, or warping. Clean or replace if necessary.
- Remove the old impeller, key, gaskets, and seals. Clean all mating surfaces thoroughly.
- Install the new seals, O-rings, and gaskets as provided in the kit.
- Slide the new impeller key onto the driveshaft. Push the new impeller down while turning the shaft clockwise to seat the vanes correctly.
- Reinstall the water pump housing and tighten bolts to the manufacturer's specified torque.
- Reattach the lower unit to the midsection, ensuring the shift shaft and water tube are properly aligned.
- Once fully assembled, reconnect the battery, start the engine, and verify a steady water stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my specific engine?
This kit fits a wide range of Mercury 3.0L DFI/EFI outboards from 1998–2012. The most reliable way to confirm fitment is to match your engine's serial number to the ranges listed in the compatibility table or cross-reference your existing water pump's part number.
Does this kit include the upper and lower housing?
Yes, this is a complete rebuild kit that includes the lower housing, upper housing face plate, impeller, and all necessary gaskets and seals. Refer to the "What’s in the Box" section for a detailed component list.
What are the signs of a failing water pump?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, steam from the exhaust, and reduced engine performance.
Is the included impeller suitable for saltwater use?
Yes, the impeller is manufactured from a durable neoprene rubber compound that is designed for excellent performance and longevity in both saltwater and freshwater environments.
What is the recommended replacement interval for a water pump?
For optimal reliability, we recommend inspecting the impeller annually and replacing the entire water pump kit every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., frequent use in sandy or silty water).
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, 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 quality control.
Payment & Security
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