Water Pump Impeller Repair Kit for Mercury/MerCruiser Alpha One Gen II and 40–300 HP Outboards
Water Pump Impeller Repair Kit for Mercury/MerCruiser Alpha One Gen II and 40–300 HP Outboards is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Repair Kit for Mercury/MerCruiser Alpha One Gen...
Water Pump Impeller Repair Kit for Mercury/MerCruiser Alpha One Gen II and 40–300 HP Outboards is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller repair kit is designed to service the lower-unit water pump on selected Mercury and MerCruiser applications. Listed applications include Mercury Mariner 4-stroke 40–60 HP BigFoot and Command Thrust models, selected 2-stroke 60–125 HP outboards, V-200, V-225 and V-250 3.0L models, selected Verado 135–300 HP outboards, and MerCruiser Alpha One Gen II sterndrives.
The kit is listed as a replacement for Mercury part numbers 47-43026Q06 and 8M0100526, with additional aftermarket references including Sierra 18-3214 and 18-3265. Always compare the original parts, engine model and serial number before ordering because water-pump components can vary by application and serial-number range.
- Service requires removal of the lower unit or gearcase to access the water-pump assembly.
- The impeller uses flexible marine-grade elastomer material for normal marine operating conditions.
- Kit components may include stainless-steel, neoprene and composite materials, depending on the component.
Part Number Matrix
These are listed OEM and aftermarket reference numbers for application checking. They should not be treated as universal confirmation of fitment without matching the engine or sterndrive model and serial number.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026Q06 |
| Mercury | 8M0100526 |
| Mercury | 47-43026Q5 |
| Mercury | 47-43026T10 |
| Mercury | 47-43026T11 |
| Mercury | 47-43026T6 |
| Mercury | 47-43026T7 |
| Mercury | 47-43026T8 |
| Sierra | 18-3214 |
| Sierra | 18-3265 |
Engine and Model Compatibility
The following applications are listed for this repair kit. Confirm the exact model, stroke, gearcase configuration and serial number before installation.
| Brand | Model or Series | Rated HP | Stroke | Application Condition | Reference Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | F40–F60 | 40–60 | 4-Stroke | BigFoot or Command Thrust | 47-43026Q06 / 8M0100526 | Verify exact model and serial number. |
| Mercury | BigFoot | 60 | 2-Stroke | S/N 0D000750 and up | 47-43026Q06 / 8M0100526 | Serial-number condition applies. |
| Mercury | Various | 70–90 | 2-Stroke | S/N 0A996142 and up | 47-43026Q06 / 8M0100526 | Serial-number condition applies. |
| Mercury | Various | 75–115 | 4-Stroke | Selected compatible models | 47-43026Q06 / 8M0100526 | Confirm the model-specific parts listing. |
| Mercury | Various | 100–125 | 2-Stroke | Selected 4-cylinder models | 47-43026Q06 / 8M0100526 | Listed for applications with non-insulated pump-cover screws. |
| Mercury | V-200, V-225 and V-250 | 200–250 | 2-Stroke | 3.0L models | 47-43026Q06 / 8M0100526 | Confirm the exact engine configuration. |
| Mercury | Verado | 135–150 | 4-Stroke | 4-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
| Mercury | Verado | 175 | 4-Stroke | 4-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
| Mercury | Verado | 200–225 | 4-Stroke | 6-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
| Mercury | Verado | 250–275 | 4-Stroke | 6-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
| Mercury | Verado | 300 | 4-Stroke | 6-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
| Mercury | Verado Pro | 200–300 | 4-Stroke | 6-cylinder models with 4.80-inch-diameter torpedo gearcases | 47-43026Q06 / 8M0100526 | Gearcase configuration is important. |
MerCruiser Sterndrive Compatibility
This kit is listed for MerCruiser Alpha One Gen II sterndrives from serial number 0D469859 and up. Confirm the sterndrive serial number and existing water-pump components before ordering.
| Brand | Model | Serial Number | Reference Part No. |
|---|---|---|---|
| MerCruiser | Alpha One Gen II | 0D469859 and up | 47-43026Q06 / 8M0100526 |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Application
- Selected Mercury outboard and MerCruiser Alpha One Gen II water-pump assemblies
- Installation
- Lower-unit or gearcase removal is required for access
- Component Materials
- May include stainless steel, neoprene, elastomer and composite materials
- Dimensions
- Designed to match the specified applications; verify against the original parts
- Weight
- Approximately 0.25 kg (8.6 oz), as listed
- Fitting Type
- Mechanical fit to the applicable water-pump and driveshaft assembly
- Temperature Range
- For normal marine operating conditions
- Product Status
- Aftermarket replacement part
What's in the Box
- 1 × Impeller, reference 47-43026Q02
- 1 × Wear plate, reference 817276
- 1 × Impeller key, reference 28-8M0032833
- 1 × Seal ring gasket, reference 26-45577
- 1 × Impeller gasket, reference 27-817277
- 1 × Face seal and tool, reference 26-816575A2
- 2 × O-rings, reference 25-21836
- 1 × Grommet
- 2 × Washers
- 2 × Drain-screw gaskets, reference 26-830749
Component references and quantities should be checked against the supplied kit before installation and compared with the parts removed from the engine or sterndrive.
Installation Notes
- Disconnect the battery and make sure the engine is switched off.
- Place a suitable container under the gearcase and drain the lubricant as required by the service procedure.
- Remove the lower unit or gearcase from the outboard or sterndrive.
- Unbolt and carefully remove the water-pump housing, noting the orientation of all components.
- Remove the old impeller, gaskets, wear plate and seals.
- Clean the mating surfaces and remove old gasket material, debris and corrosion.
- Install the replacement wear plate, gaskets and seals in the correct order.
- Install the new impeller on the driveshaft, align the keyway and fit the impeller key.
- Reinstall the water-pump housing and tighten fasteners to the applicable manufacturer's torque specification.
- Reattach the lower unit or gearcase to the engine assembly.
- Refill the gearcase with the correct lubricant and quantity for the application.
- Before normal operation, supply cooling water, briefly run the engine according to the manufacturer's procedure, verify water flow and check for leaks.
Troubleshooting and FAQ
How can I confirm that this kit fits my engine?
Match the engine or sterndrive model, stroke, gearcase configuration and serial number with the compatibility information above. Compare the original impeller, key, wear plate and gaskets before ordering. Serial-number breaks are especially important for Alpha One Gen II sterndrives and selected Mercury outboards.
What are common signs of a failing water-pump impeller?
Possible signs include overheating at idle or low speed, weak or absent water flow from the tell-tale outlet, reduced water-pressure readings or an engine warning alarm. Stop operation and inspect the cooling system if overheating occurs.
How often should a water-pump impeller be replaced?
Replacement intervals depend on the engine manufacturer's maintenance schedule and operating conditions. Inspect the impeller regularly and replace it when worn, damaged, hardened or after prolonged storage. Sandy, silty or saltwater operation may require more frequent inspection.
Is this an OEM part?
No. This is an aftermarket replacement kit intended for the listed applications and reference numbers. It is not manufactured or supplied by Mercury or MerCruiser.
Does the kit include every component shown?
The listed package contents identify the components and quantities associated with this product. Check the received contents against the list and compare them with the original assembly before beginning installation.
How fast is shipping?
Typical transit time is 5–15 days for most regions. Standard shipping availability and any expedited options are shown at checkout based on the destination.
Safety and Important Information
- Verify the engine or sterndrive model, serial number, gearcase configuration and original parts before ordering.
- Do not operate an engine without an adequate cooling-water supply.
- Follow the applicable manufacturer's service procedure and torque specifications.
- This is an aftermarket replacement part, not an original-equipment component.
- Professional installation is recommended if you are not experienced with lower-unit or sterndrive service.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for common marine service and repair applications.
- Application-Focused Listings — Product references and compatibility information are provided to help customers compare their original parts.
- Global Fulfillment — Shipping availability and delivery estimates are calculated for the destination during checkout.
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