Water Pump Kit with Housing for Johnson/Evinrude 40/50 HP and 25/30 Jet 2-Stroke Outboards – Replaces OEM 438592
Water Pump Kit with Housing for Johnson/Evinrude 40/50 HP and 25/30 Jet 2-Stroke Outboards – Replaces OEM 438592 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 Kit with Housing for Johnson/Evinrude 40/50 HP and 25/30...
Water Pump Kit with Housing for Johnson/Evinrude 40/50 HP and 25/30 Jet 2-Stroke Outboards – Replaces OEM 438592 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump kit with housing is designed for selected Johnson and Evinrude 2-stroke outboards using a small gearcase with a large water pump and three-vane impeller. It is intended for compatible 40 and 50 HP outboards and selected 25 Jet and 30 Jet applications from 1995 and later.
The kit replaces Johnson/Evinrude/OMC OEM part number 438592, also written as 0438592. It corresponds to Sierra water pump kit reference 18-3454, which is listed as a kit with housing for these applications.
- Installation location: Lower unit / gearcase
- Kit type: Water pump kit with housing
- Impeller configuration: Three-vane impeller for the specified small-gearcase application
- Application range: Selected Johnson/Evinrude 40 and 50 HP models plus 25 Jet and 30 Jet models, 1995 and later
Part Number Matrix
Use the references below to compare the replacement kit with the part being removed. Part-number references do not replace verification of the exact engine model, year, gearcase and application.
| Brand or source | Part number | Reference |
|---|---|---|
| Johnson/Evinrude/OMC | 438592 | OEM replacement reference |
| Johnson/Evinrude/OMC | 0438592 | Formatted OEM reference |
| Sierra | 18-3454 | Water pump kit with housing; replaces 438592 |
Engine & Model Compatibility
The catalog application description for this replacement identifies the following scope. Confirm the complete model designation and gearcase configuration before ordering.
| Brand | Model or application | Rated HP | Stroke | Years | OEM reference | Application notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Selected outboard models | 40 | 2-Stroke | 1995 and later | 438592 | Small gearcase with large water pump and three-vane impeller |
| Johnson/Evinrude | Selected outboard models | 50 | 2-Stroke | 1995 and later | 438592 | Small gearcase with large water pump and three-vane impeller |
| Johnson/Evinrude | 25 Jet | 25 | 2-Stroke | 1995 and later | 438592 | Jet-drive application; verify the specific model |
| Johnson/Evinrude | 30 Jet | 30 | 2-Stroke | 1995 and later | 438592 | Jet-drive application; verify the specific model |
Technical Specs
- Product type
- Aftermarket water pump kit with housing
- Installation
- Lower unit / gearcase
- Engine brand
- Johnson/Evinrude
- Stroke
- 2-Stroke
- Impeller style
- Three-vane impeller for the specified small-gearcase, large-water-pump configuration
- Replacement reference
- OEM 438592 / 0438592
What's in the Box
- 1 x Water pump housing
- 1 x Three-vane water pump impeller, cataloged as Sierra reference 18-3104-1
- Additional pump-service components supplied with the kit as packaged by the manufacturer
Package contents can vary by production packaging. Compare the supplied components with the removed pump assembly before installation, and do not substitute parts from a different water pump kit.
Installation Notes
- Confirm the engine model, year, horsepower, stroke, gearcase style and existing pump reference before beginning work.
- Disconnect the battery as appropriate for the engine and follow the engine manufacturer's service procedure for removing the lower unit.
- Remove the old water pump components and clean the mating surfaces. Inspect the driveshaft, water tube, keyway and sealing surfaces for wear or damage.
- Install the replacement pump housing and impeller in the correct orientation for the application. Use the correct impeller key and gaskets supplied for this kit.
- Reinstall the lower unit, aligning the driveshaft, shift shaft and water tube. Reconnect the shift linkage and tighten fasteners to the manufacturer's service specifications.
- Run the engine only with an appropriate water supply. Check for a strong cooling-water discharge and verify that the engine does not overheat.
Troubleshooting & FAQ
How do I confirm that this kit fits my engine?
Verify that your engine is a Johnson or Evinrude 2-stroke application listed for 40 or 50 HP, or a listed 25 Jet or 30 Jet application from 1995 and later. Also confirm the small-gearcase, large-water-pump configuration and compare the existing pump reference with OEM 438592 or 0438592.
Does this kit include the housing?
Yes. This listing is for the water pump kit with housing. It is not the separate without-housing replacement kit associated with the same OEM reference family.
What are the signs of a failing water pump impeller?
Common signs include overheating at idle or low speed, a weak or intermittent telltale stream, and brittle, cracked or damaged impeller vanes. Stop operation if the engine overheats and inspect the cooling system.
How often should the impeller be replaced?
Inspect the impeller according to the engine manufacturer's maintenance schedule and replace it when worn, damaged or hardened. Frequent operation in saltwater, sand or silt can increase wear.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to replace the listed OEM reference. It is not manufactured by Johnson or Evinrude.
Safety & Important Information
- Confirm the exact engine model, year, horsepower, stroke and gearcase configuration before purchase.
- Do not rely on horsepower alone; similar horsepower engines can use different water pump assemblies.
- Use the manufacturer's service manual for removal, installation, torque values and testing procedures.
- Professional installation is recommended if you are not familiar with outboard lower-unit service.
About Sea Sierra
- Marine replacement parts — Practical aftermarket components for routine outboard maintenance and repair.
- Application-focused listings — Product references and fitment details are provided to help you compare the replacement with your existing part.
- Service-ready solutions — Designed for maintenance work on compatible marine cooling systems.
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