Water Pump Impeller for Evinrude/Johnson 35–50 HP Outboards — Cross-References 432941, 0437059, 18-3104
Water Pump Impeller for Evinrude/Johnson 35–50 HP Outboards — Cross-References 432941, 0437059, 18-3104 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller for Evinrude/Johnson 35–50 HP Outboards — Cross...
Water Pump Impeller for Evinrude/Johnson 35–50 HP Outboards — Cross-References 432941, 0437059, 18-3104 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is designed for selected Evinrude and Johnson outboard applications. The company fitment record identifies this product for 35 HP Jet models from 1992–1993, 40 HP models from 1989–1998, 48 HP models from 1989–1996, and 50 HP models from 1989–1998.
Use the engine model, year, and existing impeller number to confirm compatibility before ordering. Model families and production changes can vary by year and serial number.
- Product type: Water pump impeller
- Application: Selected Evinrude/Johnson outboard cooling systems
- Product format: Single impeller; no kit contents are specified
- Installation: Replacement water-pump component
Part Number Cross-Reference
The following manufacturer and aftermarket references are listed for product identification and cross-referencing. They do not replace checking the complete engine model and year.
| Brand or source | Reference numbers |
|---|---|
| Evinrude / Johnson / OMC / BRP Marine | 0432941, 0765350, 0437059, 0766435, 0777825, 432941, 765350, 437059, 766433, 777825 |
| Mallory Marine | 9-45204, 9-45311, 9-45211 |
| Sierra Marine | 18-3104, 18-3104-1 |
| GLM Marine | 89940, 89460, 89790 |
| SEI Marine | 96-364-03 |
| CEF | 500372 |
Engine & Model Compatibility
Confirm the horsepower, stroke, model designation, year, and serial-number range against your service manual or the impeller being replaced.
| Brand | Application | Rated HP | Stroke | Years | Application note |
|---|---|---|---|---|---|
| Evinrude / Johnson | Jet models | 35 HP | Not specified in the company record | 1992–1993 | Confirm the exact model and serial number. |
| Evinrude / Johnson | Outboard models | 40 HP | Not specified in the company record | 1989–1998 | Confirm the exact model and serial number. |
| Evinrude / Johnson | Outboard models | 48 HP | Not specified in the company record | 1989–1996 | Confirm the exact model and serial number. |
| Evinrude / Johnson | Outboard models | 50 HP | Not specified in the company record | 1989–1998 | Confirm the exact model and serial number. |
Technical Specifications
- Product type
- Water pump impeller
- Brand application
- Evinrude / Johnson outboard
- Product format
- Single replacement impeller
- Material
- Not specified in the company product record
- Blade count
- Not specified in the company product record
- Dimensions
- Not specified in the company product record; compare with the original component and service-manual specifications before installation.
What’s in the Box
- 1 x Water pump impeller
This is a single impeller, not a complete water-pump repair kit. A key, O-ring, housing, wear plate, gasket, and other pump components are not specified as included.
Installation Notes
- Stop the engine, disconnect the battery where appropriate, and remove the engine cowling.
- Place a drain pan under the lower unit and follow the service manual’s procedure for draining the gearcase, if required for your model.
- Remove the fasteners securing the lower unit and carefully separate the gearcase from the driveshaft housing.
- Locate the water-pump housing and remove its fasteners.
- Remove the old impeller and inspect the drive key, keyway, housing, wear plate, seals, and related pump components.
- Clean debris and corrosion from the pump cavity. Replace damaged or worn related components before reassembly.
- Install the replacement impeller using the correct key and installation lubricant specified by the service manual. Do not assume a key is included with this product.
- Reinstall the pump housing, lower unit, driveshaft, shift shaft, and water tube in the correct alignment.
- Torque fasteners and refill the gearcase according to the engine manufacturer’s specifications.
- Run the engine only with an adequate water supply and verify normal cooling-water flow before returning the boat to service.
Troubleshooting & FAQ
How can I confirm this impeller fits my engine?
Compare your complete engine model, horsepower, year, and serial number with the compatibility information above and with your service manual. Also compare the old impeller’s dimensions, hub, drive-key arrangement, and blade configuration. Reference numbers are useful for identification but should not be the only fitment check.
What are the signs of a worn or failing impeller?
Common symptoms include overheating at idle or low speed, weak or absent tell-tale water flow, reduced cooling-water pressure, or visible cracking, brittleness, deformation, or missing blades during inspection.
How often should the water-pump impeller be replaced?
Inspect the impeller at the interval recommended in your engine service manual. Frequent use in saltwater, sandy water, or silty conditions can increase wear and may require more frequent inspection or replacement.
What should I check if the engine still overheats after installation?
Confirm that the impeller is correctly installed and that the drive key, housing, wear plate, seals, water tube, and intake passages are in good condition. Also check for blocked cooling passages, a faulty thermostat, damaged pump components, or an incorrectly aligned lower unit.
Is this an OEM part?
This listing is for an aftermarket replacement impeller. The reference numbers above are provided for cross-reference and fitment identification.
Safety & Important Information
- Verify the exact engine model, year, serial number, and original impeller before purchase.
- Do not rely on horsepower alone when selecting a water-pump impeller.
- Do not start an outboard without an adequate cooling-water supply.
- Follow the engine manufacturer’s service manual for disassembly, lubrication, torque values, and testing.
- Professional installation is recommended when lower-unit or cooling-system service is unfamiliar.
About Sea Sierra
- Marine replacement parts for routine outboard maintenance and repair.
- Product information organized around engine applications and reference numbers.
- Fitment guidance intended to help customers compare their engine and existing component before ordering.
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