Water Pump Service Kit for Johnson/Evinrude 2-Stroke 25–50 HP Outboards – Replaces 438592, 433548, 433549
Water Pump Service Kit for Johnson/Evinrude 2-Stroke 25–50 HP Outboards – Replaces 438592, 433548, 433549 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 Service Kit for Johnson/Evinrude 2-Stroke 25–50 HP Outbo...
Water Pump Service Kit for Johnson/Evinrude 2-Stroke 25–50 HP Outboards – Replaces 438592, 433548, 433549 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump service kit is designed for selected Johnson/Evinrude 2-stroke outboard and jet-drive applications using a small gearcase, large water pump, and three-vane impeller. It is intended to help restore water-pump performance and maintain proper engine cooling during service or repair.
The service kit is listed for Johnson/Evinrude/OMC references 438592, 433548, 433549, and 777805. Related aftermarket reference numbers include Sierra Marine 18-3454 and 18-3394, Mallory Marine 9-48209, GLM Marine 12245, and SEI Marine 96-364-01AK.
- For selected Johnson/Evinrude 2-stroke outboards and jet-drive models.
- Application type: small gearcase with a large water pump and three-vane impeller.
- Installs in the lower-unit water-pump assembly.
- Use the model, horsepower, year, gearcase, and original part number to confirm fitment before ordering.
Part Number Matrix
These are manufacturer and aftermarket reference numbers associated with this water-pump service application. Reference numbers do not replace model and gearcase verification.
| Brand | Reference Number |
|---|---|
| Johnson/Evinrude/OMC | 438592 / 0438592 |
| Johnson/Evinrude/OMC | 433548 / 0433548 |
| Johnson/Evinrude/OMC | 433549 / 0433549 |
| Johnson/Evinrude/OMC | 777805 / 0777805 |
| Sierra Marine | 18-3454 |
| Sierra Marine | 18-3394 |
| Mallory Marine | 9-48209 |
| GLM Marine | 12245 |
| SEI Marine | 96-364-01AK |
Engine & Model Compatibility
The following applications are listed for this service-kit configuration. Verify the exact engine model and original water-pump reference before installation.
| Brand | Application | Rated HP | Stroke | Years | Application Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | 2-cylinder outboard | 40, 45, 48, 50 | 2-Stroke | 1989–2005 | Loop-charged, small gearcase; large water pump with three-vane impeller |
| Johnson/Evinrude | Jet drive | 25 | 2-Stroke | 1995 and later | Confirm jet-drive unit and original part reference |
| Johnson/Evinrude | Jet drive | 30 | 2-Stroke | 1995 and later | Confirm jet-drive unit and original part reference |
| Johnson/Evinrude | Outboard | 28 | 2-Stroke | 1995–1996 | Confirm exact model and gearcase |
| Johnson/Evinrude | Outboard | 35 | 2-Stroke | 1991–1996 | Confirm exact model and gearcase |
Technical Specifications
- Product Type
- Water pump service kit
- Engine Type
- Selected Johnson/Evinrude 2-stroke outboards and jet drives
- Water-Pump Configuration
- Large water pump with three-vane impeller
- Gearcase Configuration
- Small gearcase applications
- Installation Location
- Lower unit water-pump assembly
- Fuel Type
- Gasoline
- Product Status
- Aftermarket replacement
What’s in the Box
This listing is for the water pump service-kit configuration identified above. Package contents can vary by service-kit version and application. Confirm the product images and the supplied package before installation; do not assume that a pump housing or any individual fastener, seal, gasket, key, wear plate, or other component is included unless it is shown or specifically stated for the purchased package.
Installation Notes
- Turn off the engine, remove the ignition key, and follow the manufacturer's safety procedures.
- Disconnect the battery where required by the engine manufacturer's service instructions.
- Disconnect the shift linkage as applicable and remove the fasteners securing the gearcase to the midsection.
- Lower the gearcase carefully and access the water-pump assembly.
- Remove the old water-pump service components and inspect the pump cavity, driveshaft, keyway, water tube, and mating surfaces.
- Clean all mating surfaces and install the replacement components in the correct order for the specific engine model.
- Lubricate the impeller with an appropriate marine-safe lubricant or soapy water as specified by the service procedure. Do not run a new impeller dry.
- Reassemble the water-pump components, ensuring the impeller is installed in the correct direction of rotation.
- Reinstall the gearcase, reconnect the shift linkage, and verify proper gear engagement.
- Run the engine only in an approved test tank or with the correct flushing equipment, and confirm a steady cooling-water discharge before normal operation.
Troubleshooting & FAQ
Which engines does this service kit fit?
It is listed for selected Johnson/Evinrude 2-stroke applications including 40, 45, 48, and 50 HP two-cylinder models from 1989–2005; 25 and 30 HP jet-drive models from 1995 and later; 28 HP models from 1995–1996; and 35 HP models from 1991–1996. Exact model, year, gearcase, and original part-number verification are required.
What water-pump configuration does it use?
The listed application uses a small gearcase with a large water pump and a three-vane impeller.
Does this listing include a pump housing?
Package configuration should be confirmed from the product images and the package supplied with the order. Do not assume that a pump housing is included unless it is specifically shown or stated for the purchased version.
Can I use it on an engine outside the listed years?
Do not rely on horsepower alone. Engines outside the listed year ranges may use a different gearcase or water-pump configuration. Compare the original part number and application details before ordering.
What are the signs of a worn water-pump impeller?
Common signs include a weak or intermittent telltale stream, overheating at idle or low speed, reduced cooling-water flow, or damaged, brittle, or cracked impeller vanes during inspection.
Is this an OEM part?
No. This is an aftermarket replacement service kit associated with the listed Johnson/Evinrude/OMC and aftermarket reference numbers.
How often should the impeller be inspected?
Inspect the water-pump system according to the engine manufacturer's maintenance schedule and after operating in sandy, silty, or contaminated water. Replace worn or damaged components promptly.
Safety & Important Information
- Verify the complete engine model, year, horsepower, stroke, gearcase configuration, and original part number before purchase.
- Do not operate the engine without an adequate water supply to the cooling system.
- Follow the manufacturer's torque values, sealant requirements, and lower-unit service procedure.
- Professional installation is recommended if you are not familiar with outboard lower-unit service.
- This is an aftermarket replacement and is not manufactured by Johnson, Evinrude, or OMC.
About Sea Sierra
- Marine Replacement Parts — We supply aftermarket components for routine service and repair applications.
- Application-Focused Listings — Product information is organized around engine model, year, horsepower, and part-number references.
- Service Support — Always compare the original component and follow the manufacturer's installation procedure before fitting a replacement part.
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