Water Pump Rebuild Kit for Honda BF75 & BF90 4-Stroke Outboards, 1996–1998
Water Pump Rebuild Kit for Honda BF75 & BF90 4-Stroke Outboards, 1996–1998 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Rebuild Kit for Honda BF75 & BF90 4-Stroke Outboards...
Water Pump Rebuild Kit for Honda BF75 & BF90 4-Stroke Outboards, 1996–1998 is backordered and will ship as soon as it is back in stock.
Product Details
This water pump rebuild kit is intended for servicing the cooling system on selected Honda BF75 and BF90 4-stroke outboard motors from the 1996–1998 model period. The kit includes an impeller, gaskets, seal ring, and pump components for water pump service. Replacing worn pump components helps restore water circulation and reduce the risk of overheating.
The kit is supplied as an aftermarket replacement and is listed as a cross-reference for Honda OEM part 19021-ZW1-003, Sierra 18-3187 and 18-3214, Mercury 46-43026Q06, 47-43026Q06 and 8M0100526, and WSM 725-155. Always compare the original pump assembly, engine model, year, and serial or frame number before ordering.
- Water pump service components for selected marine outboard applications.
- Includes the impeller, plates, gaskets, seal ring, and additional listed component.
- Aftermarket replacement designed for direct mechanical installation where the listed part references and fitment conditions match.
- Use the compatibility information below as a guide and verify the exact engine identification before installation.
Part Number Matrix
The following numbers are listed as OEM or aftermarket reference numbers for this water pump service kit. Reference numbers alone do not replace model, year, serial-number, or frame-number verification.
| Brand | Part Number |
|---|---|
| Honda | 19021-ZW1-003 |
| Sierra | 18-3187 |
| Sierra | 18-3214 |
| Mercury | 46-43026Q06 / 47-43026Q06 / 8M0100526 |
| WSM | 725-155 |
Engine & Model Compatibility
Fitment may vary by model designation, production year, frame number, and serial number. Confirm the complete engine identification and compare the original component before purchase.
Honda: The supplied application information lists BF75A and BF90A models from 1997–1998 with frame number 1200001 and higher, along with selected BF75AW, BF75AT, BF90AW, BF90AT, and BF70 applications from the 1996–1998 period.
Mercury, Mariner, and Force: The supplied cross-reference information includes several 2-stroke and 4-stroke applications. Some applications require a specific serial-number range or additional pump-cover conditions. Do not rely on horsepower alone to establish fitment.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Honda | BF75A | 75 | 4-Stroke | 1997–1998 | 19021-ZW1-003 | Frame 1200001 and higher |
| Honda | BF90A | 90 | 4-Stroke | 1997–1998 | 19021-ZW1-003 | Frame 1200001 and higher |
| Honda | BF75AW | 75 | 4-Stroke | 1996–1998 | 19021-ZW1-003 | Verify original pump components |
| Honda | BF75AT | 75 | 4-Stroke | 1996–1998 | 19021-ZW1-003 | Verify original pump components |
| Honda | BF90AW | 90 | 4-Stroke | 1996–1998 | 19021-ZW1-003 | Verify original pump components |
| Honda | BF90AT | 90 | 4-Stroke | 1996–1998 | 19021-ZW1-003 | Verify original pump components |
| Honda | BF70 | 70 | 4-Stroke | 1996–1998 | 19021-ZW1-003 | Application listed by WSM; verify before ordering |
| Brand | Model or Configuration | Rated HP | Stroke | Years | Reference No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | BigFoot | 40–60 | 4-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Verify exact model and serial number |
| Mercury | BigFoot | 60 | 2-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Serial number OD000750 and higher |
| Mercury | 4-Stroke | 75–115 | 4-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Verify exact model and serial number |
| Mercury | 3-cylinder | 70–90 | 2-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Serial number 0A996142 and higher |
| Mercury | 4-cylinder | 100–125 | 2-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Pump-cover screws without insulators |
| Mercury | V-Series, 3.0 L | 200–250 | 2-Stroke | Not specified | 47-43026Q06 / 8M0100526 | Verify exact model and serial number |
| Brand | Model or Configuration | Rated HP | Stroke | Years | Reference No. | Notes |
|---|---|---|---|---|---|---|
| Force | Outboard | 90 | 2-Stroke | 1995–1997 | 46-43026Q06 | Verify exact model and serial number |
| Force | Outboard | 120 | 2-Stroke | 1995–1997 | 46-43026Q06 | Verify exact model and serial number |
Technical Specifications
- Product Type
- Water pump impeller service kit
- Application
- Selected marine outboard cooling-system applications
- Installation
- Direct mechanical replacement where application conditions match
- Included Impeller Reference
- 47-43026-1
- Material Information
- Impeller and pump-service components supplied for marine use; compare the original parts before installation
- Product Status
- Aftermarket replacement, not an OEM-branded component
What’s in the Box
- 1 × Water pump base-to-face-plate gasket — 27-43033-1
- 1 × Water pump base-to-gear-housing gasket — 27-43047-1
- 1 × Face-plate-to-water-pump-cover gasket — 27-817277
- 1 × Seal ring — 26-45577
- 1 × Impeller — 47-43026-1
- 1 × Impeller plate — 817276
- 1 × Additional component — 25-21836
Installation Notes
- Disconnect the battery and follow the engine manufacturer’s safety procedures before beginning work.
- Disconnect the shift linkage as required, then remove the lower unit or gearcase.
- Unbolt and remove the water-pump cover and existing pump components.
- Inspect the housing and mating surfaces for wear, scoring, corrosion, or other damage. Remove the old impeller, plate, seals, and gaskets.
- Clean all mating surfaces thoroughly and remove old gasket material or sealant.
- Install the supplied gaskets, seal ring, impeller plate, and other components in the same locations as the original parts.
- Install the new impeller in the correct direction. Rotate the driveshaft clockwise where specified by the engine service procedure to seat the impeller vanes.
- Reinstall the pump housing and tighten the fasteners to the engine manufacturer’s specified torque.
- Reattach the lower unit and shift linkage. Test the engine in a safe water environment and confirm normal cooling-water flow from the tell-tale outlet.
Troubleshooting & FAQ
Does this kit fit my Honda BF75 or BF90?
The supplied application information lists selected BF75 and BF90 models from 1996–1998, including BF75A and BF90A models from 1997–1998 with frame number 1200001 and higher. Model suffixes and frame numbers matter, so compare your complete engine identification and the original pump assembly before ordering.
Can this kit be used on a Mercury, Mariner, or Force outboard?
The listed cross-references include selected Mercury, Mariner, and Force applications. Some require specific serial-number ranges or pump-cover conditions. Confirm the exact model, stroke, horsepower, serial number, and reference number rather than relying on the brand or horsepower alone.
What are the signs of a worn water pump?
Common signs include overheating at idle or low speed, a weak or intermittent tell-tale stream, reduced cooling-water flow, and an impeller that is cracked, dry, deformed, or missing vanes.
How often should an outboard impeller be replaced?
Inspect the impeller according to the engine manufacturer’s maintenance schedule. Replacement intervals depend on operating hours, storage conditions, saltwater exposure, sediment, and whether the engine has been run without adequate water supply.
Is this an OEM part?
No. This is an aftermarket water pump service kit supplied as a replacement for the listed OEM and aftermarket reference numbers. Verify dimensions, component layout, and application conditions before installation.
What warranty and return coverage applies?
Warranty, returns, and shipping are subject to the applicable store policy and the order terms shown at checkout. Contact support before installation if the received components do not match the ordered application.
Safety & Important Information
- Verify the engine model, year, stroke, horsepower, serial or frame number, and original part number before purchase.
- Do not operate an outboard without an adequate water supply. Follow the manufacturer’s service and testing procedures.
- Inspect the pump housing and related components before reassembly; replacing an impeller will not correct a damaged housing or other cooling-system fault.
- This is an aftermarket replacement part and is not manufactured or branded by Honda, Mercury, Mariner, Force, Sierra, or WSM.
- Professional installation is recommended when lower-unit removal or shift-linkage adjustment is required.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for maintenance and repair of marine engines and systems.
- Application-Focused Listings — Product references and fitment details are provided to help match replacement parts to the original application.
- Support Before Installation — Compare the original part and contact support if the application, reference number, or included components do not match your needs.
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