Water Pump Impeller Kit with Housing for Mercury Marine, MerCruiser and Force Applications — Replaces 817275A5 and 817275Q05
Water Pump Impeller Kit with Housing for Mercury Marine, MerCruiser and Force Applications — Replaces 817275A5 and 817275Q05 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit with Housing for Mercury Marine, MerCruiser...
Water Pump Impeller Kit with Housing for Mercury Marine, MerCruiser and Force Applications — Replaces 817275A5 and 817275Q05 is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller Kit with Housing is an aftermarket replacement kit for selected Mercury Marine and MerCruiser water-pump applications. It is listed for compatible Mercury outboards, Alpha One Gen 2 stern drives, Bigfoot models, and selected Chrysler/Force outboards. Confirm the exact engine model, year, stroke, and serial-number range before ordering.
The kit is listed as an interchange for Mercury part numbers 817275A5 and 817275Q05, with additional aftermarket references including Sierra 18-3570, Mallory 9-48315, and GLM 12415. Reference numbers identify comparable applications; they do not replace model and serial-number verification.
- Direct-replacement water-pump service kit for listed applications.
- Includes a water-pump housing, neoprene impeller, gaskets, seals, O-rings, and key.
- Designed for a complete water-pump assembly overhaul where the listed components are required.
Part Number Matrix
Use these references together with your engine information to confirm application.
| Brand | Part Number |
|---|---|
| Mercury | 817275A5 / 817275A6 / 817275A4 / 817275T4 / 817275Q4 / 817275Q05 |
| Sierra | 18-3570 / 18-3147 |
| Mallory | 9-48315 / 9-48314 |
| GLM | 12415 |
| Redline | RL3570 |
Engine and Model Compatibility
The following applications are listed for this kit. Model, year, stroke, and serial conditions must be considered together. Verify the number stamped on your engine against the applicable service information before installation.
| Brand | Model | Rated HP | Stroke | Year or Serial Range | Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | 3.0L EFI | 200 | 4-Stroke | 0T750164–1B504988 | 817275A5 | DFI and EFI models |
| Mercury | 3.0L EFI | 225 | 4-Stroke | 0G760300–1B504988 | 817275A5 | Carbureted, DFI, EFI, Seapro, and Marathon models |
| Mercury | 3.0L EFI | 250 | 4-Stroke | 0G760300–1B504988 | 817275A5 | EFI models |
| Mercury | 3.0L EFI | 250XB | 4-Stroke | 0G980600–0T800999 | 817275A5 | EFI models |
| Mercury | 225 PRO XS | 225 | 4-Stroke | 1B104549–1B426560 | 817275A5 | DFI 3.0L models |
| Mercury | Alpha One Gen 2 | N/A | N/A | 1991 and newer | 817275K05 / 817275Q05 | Stern-drive applications |
| Mercury | Bigfoot | 40 | 4-Stroke | OT228407 and newer | 817275A1 / A2 | 4-cylinder models |
| Mercury | Bigfoot Bodensee | 45 | 4-Stroke | OG231123 and newer | 817275A1 / A2 | |
| Mercury | Bigfoot | 50 | 4-Stroke | OG231123–OT178499 | 817275A1 / A2 | 935cc models |
| Mercury | Bigfoot | 50 | 4-Stroke | OT178500 and newer | 817275A1 / A2 | 996cc models |
| Mercury | Bigfoot | 60 | 4-Stroke | OD000750 and newer | 817275A1 / A2 | 3-cylinder models |
| Mercury | Standard | 60 | 4-Stroke | OT178500 and newer | 817275A1 / A2 | |
| Mercury | Jet | 65 | 4-Stroke | OC283222 and newer | 817275A1 / A2 | |
| Mercury | Standard | 70 | 4-Stroke | OA996142 and newer | 817275A1 / A2 | 3-cylinder models |
| Mercury | Standard | 75 | 4-Stroke | OC222000 and newer | 817275A1 / A2 | 3-cylinder models |
| Mercury | Standard | 75 | 4-Stroke | OG960500 and newer | 817275A1 / A2 | 4-stroke models |
| Mercury | Standard | 80 | 4-Stroke | OA996142 and newer | 817275A1 / A2 | 3-cylinder models |
| Mercury | Jet | 80 | 4-Stroke | OD283222 and newer | 817275A1 / A2 | |
| Mercury | Standard | 90 | 4-Stroke | OA996142 and newer | 817275A1 / A2 | 3-cylinder models |
| Mercury | Standard | 90 | 4-Stroke | OG960500 and newer | 817275A1 / A2 | 4-stroke models |
| Mercury | Standard | 100 | 4-Stroke | OB209468 and newer | 817275A1 / A2 | 4-cylinder models |
| Mercury | Standard | 115 | 4-Stroke | OC100000 and newer | 817275A1 / A2 | 4-cylinder models |
| Mercury | Standard | 125 | 4-Stroke | OD283222 and newer | 817275A1 / A2 | 4-cylinder models |
| Mercury | V-200 | 200 | 4-Stroke | OG386496 and newer | 817275A1 / A2 | DFI 3.0L models |
| Mercury | V-225 | 225 | 4-Stroke | OD280813 and newer | 817275A1 / A2 | DFI 3.0L carbureted and EFI models |
| Mercury | V-225 | 225 | 4-Stroke | OD590000 and newer | 817275A1 / A2 | DFI models |
| Mercury | V-250 | 250 | 4-Stroke | OG129222 and newer | 817275A1 / A2 | EFI 3.0L models |
Chrysler and Force Applications
| Brand | Model | Rated HP | Stroke | Years | Reference | Notes |
|---|---|---|---|---|---|---|
| Force | Standard | 75 | 2-Stroke | 1999 | 817275A5 | |
| Force | Standard | 90 | 2-Stroke | 1995–1999 | 817275A5 | |
| Force | Standard | 120 | 2-Stroke | 1995–1999 | 817275A5 |
Technical Specifications
- Product Type
- Water pump impeller kit with housing
- Installation
- Direct replacement for listed applications
- Housing Material
- Stainless steel
- Impeller Material
- Neoprene rubber
- Gasket Material
- Non-asbestos
What’s in the Box
- 1 × Carrier seal (821759A4)
- 1 × Impeller (47-43026T2)
- 1 × Impeller plate (8172761)
- 1 × Impeller key (28-43037)
- 2 × O-rings (25-21836)
- 1 × Seal ring gasket (26-45577B1)
- 1 × Face seal and tool (26-816575A2)
- 1 × Impeller gasket (27-430331)
- 1 × Impeller gasket (27-8172771)
- 1 × Drain screw gasket (12-191833)
Installation Notes
- Disconnect the battery and shift the engine into neutral.
- Remove the lower unit or gearcase according to the service manual.
- Remove the existing water-pump housing assembly from the driveshaft.
- Clean the driveshaft and mating surfaces, removing old gasket material and corrosion.
- Install the applicable gaskets, face seal, and key on the driveshaft.
- Lightly lubricate the inside of the housing and the impeller with suitable marine lubricant.
- Install the impeller on the driveshaft, turning the shaft clockwise so the vanes seat correctly.
- Install and secure the housing according to the manufacturer’s torque specifications.
- Reinstall the lower unit, reconnect the battery, and test the cooling system in water.
Troubleshooting and FAQ
How do I confirm fitment?
Compare the engine model, year, stroke, and complete serial-number range with the tables above. The serial number is the most reliable way to verify fitment. If your engine information does not match, consult the service manual or contact us before ordering.
What are signs of a failing impeller?
Possible signs include overheating at idle or low speed, a weak or absent tell-tale stream, and cracked, hardened, or damaged impeller vanes.
How often should the impeller be replaced?
Inspect the impeller regularly and replace it according to the engine manufacturer’s maintenance schedule. More frequent service may be appropriate in saltwater, sandy, or otherwise abrasive operating conditions.
Why replace the housing with the impeller?
A scored, melted, corroded, or excessively worn housing can reduce water-pump performance. Replacing the housing with the impeller helps restore the intended sealing surface when the housing is damaged.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the listed applications and reference numbers.
What should I do if the part does not match my engine?
Do not install a part that differs from the required application or original assembly. Recheck the model and serial information and contact support before installation.
Safety and Important Information
- Verify the engine model, year, stroke, serial range, and original part before purchase.
- This is an aftermarket replacement, not an OEM component.
- Follow the engine manufacturer’s service procedures and torque specifications.
- Professional installation is recommended when lower-unit removal or cooling-system service is unfamiliar.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable service in real-world conditions.
- Global Fulfillment — Standard and expedited delivery options are shown at checkout where available.
- Manufacturer-Direct Value — Competitive pricing without unnecessary distribution markups.
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