Water Pump Repair Kit for Mercury/Mariner Outboards and MerCruiser Alpha One Gen II — Replaces 8M0100526 and 47-8M0100526
Water Pump Repair Kit for Mercury/Mariner Outboards and MerCruiser Alpha One Gen II — Replaces 8M0100526 and 47-8M0100526 is backordered and will ship as soon as it is back in stock.
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Water Pump Repair Kit for Mercury/Mariner Outboards and MerCruiser ...
Water Pump Repair Kit for Mercury/Mariner Outboards and MerCruiser Alpha One Gen II — Replaces 8M0100526 and 47-8M0100526 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Repair Kit is intended to service the cooling-water pump on selected Mercury and Mariner outboards and MerCruiser Alpha One Gen II sterndrives. The kit is supplied without a complete pump housing and is designed for applications that use the listed OEM reference numbers. Always compare the existing pump components and verify the engine model, horsepower, stroke, and serial-number range before ordering.
Applicable OEM reference numbers include 8M0100526, 47-8M0100526, and related references listed below. These numbers are reference and interchange information only; they do not indicate that every listed application uses identical components.
- Replacement water-pump service components for selected Mercury/Mariner and MerCruiser applications.
- Includes an impeller, drive key, faceplate, gaskets, seals, O-rings, and drain-plug seals.
- Supplied without a complete pump housing.
- Confirm the original part number and application details before installation.
Part Number Matrix
The following manufacturer and interchange references are associated with this style of water-pump repair kit. Confirm the correct reference for your specific engine or sterndrive.
| Brand | Part Number |
|---|---|
| Mercury/Quicksilver | 8M0100526 |
| Mercury/Quicksilver | 47-8M0100526 |
| Mercury/Quicksilver | 8M0100527 |
| Mercury/Mariner | 47-43026K06 |
| Mercury/Mariner | 47-43026Q06 |
| Mercury/Mariner | 47-43026T06 |
| Mercury/Mariner | 47-43026T08 |
| Mercury/Mariner | 47-43026T11 |
Engine and Model Compatibility
Compatibility depends on the complete model configuration and serial-number range. The ranges below are application leads associated with the listed references, not a substitute for checking the engine or sterndrive parts diagram.
| Brand | Model or Application | Rated HP | Stroke | Serial or Application Notes | Reference |
|---|---|---|---|---|---|
| Mercury/Mariner | BigFoot and Command Thrust applications | 40–60 | 4-Stroke | Verify exact model and serial range. | 47-8M0100526 |
| Mercury/Mariner | BigFoot, 3-cylinder applications | 60–90 | 2-Stroke | Includes selected 60 HP BigFoot applications; verify serial range. | 47-8M0100526 |
| Mercury/Mariner | Selected 3- and 4-cylinder models | 70–125 | 2-Stroke | Includes selected Optimax and carbureted applications; verify pump-cover configuration. | 47-8M0100526 |
| Mercury/Mariner | Selected 4-Stroke and Verado applications | 75–300 | 4-Stroke | Application varies by gearcase and engine configuration. | 47-8M0100526 |
| Mercury/Mariner | V-200, V-225, and V-250 3.0L applications | 200–250 | 2-Stroke | Verify the exact pump assembly before ordering. | 47-8M0100526 |
MerCruiser Sterndrive Compatibility
| Brand | Model | Serial or Application Notes | Reference |
|---|---|---|---|
| MerCruiser | Alpha One Gen II | Selected units from approximately serial D494569 and later. Confirm the serial number and water-pump configuration in the service documentation. | 47-8M0100526 |
Technical Specifications
- Product Type
- Water pump repair kit
- Application
- Selected Mercury/Mariner outboards and MerCruiser Alpha One Gen II sterndrives
- Pump Housing
- Not included; service kit is supplied without a complete housing
- Installation
- Replacement service components for the original water-pump assembly
- Weight
- 0.52 lb (0.24 kg)
What's in the Box
- 1 x Water pump impeller (8M0025709)
- 1 x Impeller drive key (8M0032833)
- 1 x Water pump faceplate (8172761)
- 1 x Water pump gasket (8172771)
- 1 x Faceplate gasket (8M0050720)
- 1 x Face seal (8M2014338)
- 1 x Face-seal setting tool (818769)
- 1 x Quad ring (455771)
- 2 x O-ring, 0.796 in. x 0.139 in. (21836)
- 1 x O-ring, 0.921 in. x 0.139 in. (90196)
- 2 x Drain-plug seal (830749)
Installation Notes
- Disconnect the battery and place the outboard or sterndrive in neutral.
- Remove the gearcase or lower unit according to the engine or sterndrive service manual.
- Remove the existing water-pump cover and worn pump components.
- Clean the mating surfaces and remove old gasket material and debris.
- Install the supplied gaskets, faceplate, impeller, drive key, seals, and O-rings in the correct locations.
- Use a marine-compatible lubricant where specified by the service manual. Do not install the impeller dry.
- Reassemble the pump and reinstall the gearcase or lower unit, ensuring correct driveshaft and water-tube alignment.
- Start the engine only with an adequate water supply and verify a normal cooling-water discharge.
Troubleshooting and FAQ
How do I know if the water pump needs service?
Common warning signs include a weak or intermittent tell-tale stream, an overheating alarm, elevated operating temperature, or cracked, worn, or distorted impeller blades.
How often should the impeller be replaced?
Inspect the impeller at the interval specified in the engine or sterndrive service manual. Replacement frequency depends on operating hours, storage conditions, and saltwater or freshwater use. Replace it sooner if the engine has been run without sufficient water or if the blades show damage.
Is the pump housing included?
No. This is a repair kit supplied without a complete pump housing. Reuse the original housing only if it meets the service-manual inspection limits.
Will this kit fit an application not listed above?
Do not assume fitment from horsepower alone. Compare the complete OEM reference, model, year where applicable, stroke, gearcase, and serial number with the service manual or parts diagram before ordering.
Is this an OEM Mercury or MerCruiser kit?
No. This listing is for an aftermarket replacement kit. Mercury, Mariner, MerCruiser, and the referenced manufacturer part numbers are used only to identify intended applications and compatibility references.
Safety and Important Information
- Verify the original part number, model, horsepower, stroke, gearcase, and serial-number range before purchase.
- Do not operate an engine without an adequate cooling-water supply.
- Follow the applicable factory service manual for removal, installation, lubrication, torque, and testing procedures.
- Professional installation is recommended when lower-unit or sterndrive service experience is limited.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for practical service and repair applications.
- Global Fulfillment — Standard and expedited delivery options are shown at checkout where available.
- Manufacturer-Direct Value — Competitive pricing with product information focused on accurate application matching.
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