Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruiser Alpha One Gen II Stern Drives — Replaces 47-43026Q06 and 8M0100526
Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruiser Alpha One Gen II Stern Drives — Replaces 47-43026Q06 and 8M0100526 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruise...
Water Pump Impeller Kit for Mercury Mariner Outboards and MerCruiser Alpha One Gen II Stern Drives — Replaces 47-43026Q06 and 8M0100526 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump impeller kit is intended for servicing cooling-system water pumps used on selected Mercury and Mariner outboards and MerCruiser Alpha One Gen II stern drives. Replacing a worn or damaged impeller can help restore water circulation and reduce the risk of overheating. Always verify the exact engine or drive model, year, and serial-number requirements before installation.
This aftermarket replacement is associated with Mercury references 47-43026Q06, 47-8M0100526, 47-43026Q5, 47-43026T6, 47-43026T7, 47-43026T8, 47-43026T10, and 47-43026T11, as well as Sierra references 18-3214 and 18-3265. Reference numbers are provided for identification and should be matched against the application and original component before ordering.
- Replacement water-pump service kit for selected Mercury, Mariner, and MerCruiser applications.
- Neoprene-rubber impeller with a plastic hub for water-pump service.
- Includes impeller, gaskets, seals, key, plate, and other listed service components.
- Application-specific components may not all be used on every engine or drive configuration.
Part Number Matrix
Use the following references to compare the replacement with the part currently installed on your engine or stern drive.
| Brand | Part Number |
|---|---|
| Mercury | 47-43026Q06 |
| Mercury | 47-8M0100526 |
| Mercury | 47-43026Q5 |
| Mercury | 47-43026T6 |
| Mercury | 47-43026T7 |
| Mercury | 47-43026T8 |
| Mercury | 47-43026T10 |
| Mercury | 47-43026T11 |
| Sierra | 18-3214 |
| Sierra | 18-3265 |
Engine and Model Compatibility
The applications below are provided as an identification guide. Fitment can depend on horsepower, model designation, stroke, production year, pump-cover configuration, and serial number. Match all available details against the engine or drive identification label and the original water-pump components.
Mercury and Mariner Outboards
| Brand | Model or Configuration | Rated HP | Stroke | Years or Serial Condition | Reference | Notes |
|---|---|---|---|---|---|---|
| Mercury | F40-F60 BigFoot / Command Thrust | 40-60 | 4-Stroke | 1998 and newer | 47-43026Q06 | Confirm the exact model and water-pump configuration. |
| Mercury | BigFoot | 60 | 2-Stroke | Serial 0D000750 and higher | 47-43026Q06 | Serial-number verification is required. |
| Mercury | Standard | 70-90 | 2-Stroke | Serial 0A996142 and higher | 47-43026Q06 | Serial-number verification is required. |
| Mercury | Standard | 75-115 | 4-Stroke | 2000 and newer | 47-43026Q06 | Confirm the exact engine model. |
| Mercury | 4-Cylinder | 100-125 | 2-Stroke | 2000 and newer | 47-43026Q06 | Listed configuration uses pump-cover screws without insulators. |
| Mercury | EFI | 150 | 4-Stroke | 2000 and newer | 47-43026Q06 | Confirm the exact serial range. |
| Mercury | V6, 3.0 L | 200-250 | 2-Stroke | 1998 and newer | 47-43026Q06 | Confirm the exact engine model and serial range. |
| Mercury | Verado, 4-Cylinder | 135-175 | 4-Stroke | 2006 and newer | 47-43026Q06 | Various serial-number ranges apply. |
| Mercury | Verado, 6-Cylinder | 200-300 | 4-Stroke | 2006 and newer | 47-43026Q06 | Listed applications use 4.80-inch torpedo gear cases. |
MerCruiser Stern Drives
| Brand | Drive | Engine HP | Stroke | Serial Condition | Reference | Notes |
|---|---|---|---|---|---|---|
| MerCruiser | Alpha One Gen II | Not specified | Not specified | Serial 0D469859 and higher | 47-43026Q06 | Confirm the drive serial number and original pump components. |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Replacement Type
- Aftermarket replacement for selected applications
- Impeller Material
- Neoprene rubber
- Hub Material
- Plastic
- Faceplate Material
- Metal alloy
- Impeller Dimensions
- Approximately 22.25 mm shaft insert x 87.92 mm diameter x 31.97 mm height
- Number of Blades
- 6
- Weight
- Approximately 67 g for the impeller and 330 g for the complete kit
What's in the Box
- 1 x Impeller, references 47-43026T2 / 18-3056
- 1 x Impeller plate, references 8172761 / 18-3122
- 1 x Face impeller plate-to-cover gasket, reference 27-43033
- 1 x Gearcase cover gasket, reference 27-43047
- 2 x Faceplate-to-water-pump gaskets, reference 27-8172771
- 2 x Water-pump face-seal installation tools, reference 26-8M2014338
- 2 x O-rings, reference 25-21837
- 1 x Quad ring, reference 26-45577-1
- 1 x Impeller key, reference 28-43037
- 1 x Slinger seal, reference 26-816575A-2
- 1 x Coupling assembly for MerCruiser stern drives, reference 816597A-1
- 1 x Coupling assembly/tube for Mercury outboard lower units, reference 8M0036238
- 1 x Coupling/tube assembly for Mercury outboard lower units, reference 22-887987A1
Some components are configuration-specific. Use only the parts that match the original water-pump assembly and the service instructions for the applicable engine or drive.
Installation Notes
- Disconnect the battery and make sure the engine is switched off and cool.
- For applicable outboard installations, shift into forward gear to assist driveshaft alignment during reassembly.
- Drain the gearcase lubricant from the lower unit as required by the service procedure.
- Remove the fasteners securing the lower unit to the engine midsection.
- Lower the gearcase carefully to access the water-pump housing.
- Remove the water-pump housing fasteners and lift the housing to expose the impeller.
- Remove the old impeller, gaskets, seals, and faceplate. Clean all mating surfaces thoroughly.
- Install the applicable new components. Lightly lubricate the impeller with clean water or mild soap; do not use petroleum-based lubricant on the rubber impeller.
- Make sure the impeller key is correctly seated. Rotate the driveshaft clockwise while lowering the housing so the vanes enter the housing correctly.
- Reassemble the lower unit, refill the gearcase with the correct lubricant, and test the engine with an appropriate water supply.
Follow the manufacturer's service procedure for torque values, seal orientation, lubricant specifications, and final testing. Professional installation is recommended when the correct procedure or application is uncertain.
Troubleshooting and FAQ
How do I confirm whether this kit fits my engine?
Match the engine or drive brand, model, horsepower, stroke, year, and serial number against the compatibility information above. For MerCruiser applications, verify that the drive is an Alpha One Gen II with the applicable serial range. Also compare the original impeller, key, cover, and gasket arrangement before installation.
What are the signs of a failing water-pump impeller?
Common signs include a weak or absent telltale stream, an overheating warning, higher-than-normal operating temperature at idle or low speed, or a brittle, melted, or damaged impeller during inspection. Continued operation with inadequate cooling can cause serious engine damage.
How often should the impeller be replaced?
Replacement intervals depend on the engine manufacturer, operating conditions, and service history. Many owners replace water-pump impellers as a preventative-maintenance item every one to two years or after approximately 100 to 200 operating hours. Saltwater, sand, silt, and extended storage can require more frequent service.
Why are there extra or different-looking parts in the kit?
The listed kit includes components for different lower-unit and water-pump configurations. Not every component is used on every application. Compare the parts with the original assembly and use the configuration-specific service instructions.
Are the face-seal installation tools included?
Two water-pump face-seal installation tools are listed in the package contents. Inspect the package when it arrives and verify the contents before beginning installation.
Is this an OEM part?
No. This listing is for an aftermarket replacement kit. The manufacturer and packaging may differ from the original equipment part. Verify the application and component dimensions before purchase.
What is the difference between this kit and an individual impeller?
An individual impeller normally replaces only the rubber impeller. This listing is presented as a service kit and includes additional gaskets, seals, a key, plate, tools, and configuration-specific components listed above.
How should I check the parts before installation?
Compare the impeller diameter, height, hub, keyway, blade count, gasket shapes, seal dimensions, and cover arrangement with the original components. Do not install a part that differs from the service requirements for your engine or drive.
Safety and Important Information
- Verify the engine or drive model, year, horsepower, stroke, and serial number before ordering.
- Compare the photographs, dimensions, reference numbers, and original components before installation.
- Do not operate the engine without an adequate water supply and correct cooling-system procedure.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended if you are unfamiliar with lower-unit or stern-drive service.
About Sea Sierra
- Pro-Grade Standards — Marine replacement parts selected for dependable fit and service performance.
- Global Fulfillment — Shipping options and delivery estimates are shown at checkout based on destination.
- Value-Focused Marine Parts — Practical replacement solutions for routine marine maintenance and repair.
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