Water Pump Impeller – Fits Johnson/Evinrude 2-4 HP (Replaces 433935, 396852)
Water Pump Impeller – Fits Johnson/Evinrude 2-4 HP (Replaces 433935, 396852) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller – Fits Johnson/Evinrude 2-4 HP (Replaces 433935...
Water Pump Impeller – Fits Johnson/Evinrude 2-4 HP (Replaces 433935, 396852) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller is designed for Johnson/Evinrude 2-stroke 2, 2.5, 3, 3.5, and 4 HP outboards, including Ultra and Excel models from 1987–2006. It is a critical component for maintaining your engine's cooling system to prevent overheating.
This part serves as a direct replacement for Johnson/Evinrude part numbers 433935, 433915, 396852, 767407, and 500332, and interchanges with Sierra Marine 18-3015.
- Engineered for direct OEM replacement, ensuring a precise fit.
- Constructed from a durable copper and rubber blend for reliable performance.
- Essential for preventing engine overheating by maintaining proper water circulation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 433935 |
| Johnson/Evinrude | 433915 |
| Johnson/Evinrude | 396852 |
| Johnson/Evinrude | 767407 |
| Johnson/Evinrude | 500332 |
| Sierra Marine | 18-3015 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller fits a range of small horsepower 2-stroke outboards from Johnson and Evinrude manufactured between 1987 and 2006.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson | J2 | 2 | 2-Stroke | 1987–2006 | 433935 | |
| Johnson | J3 | 3 | 2-Stroke | 1987–2006 | 433935 | |
| Johnson | J4 | 4 | 2-Stroke | 1987–2006 | 433935 | |
| Evinrude | E3 | 3 | 2-Stroke | 1987–2006 | 433935 | |
| Evinrude | E4 | 4 | 2-Stroke | 1987–2006 | 433935 | |
| Johnson/Evinrude | 2 HP | 2 | 2-Stroke | 1987–2006 | 433935 | Ultra/Excel models |
| Johnson/Evinrude | 2.5 HP | 2.5 | 2-Stroke | 1987–2006 | 433935 | Ultra/Excel models |
| Johnson/Evinrude | 3 HP | 3 | 2-Stroke | 1987–2006 | 433935 | Ultra/Excel models |
| Johnson/Evinrude | 3.5 HP | 3.5 | 2-Stroke | 1987–2006 | 433935 | Ultra/Excel models |
| Johnson/Evinrude | 4 HP | 4 | 2-Stroke | 1987–2006 | 433935 | Ultra/Excel models |
Technical Specs
- Product Type
- Water Pump Impeller
- Material
- Copper + Rubber
- Number of Blades
- 3
- Height
- 17 mm (0.67 in)
- Outer Diameter
- 34 mm (1.34 in)
- Inner Shaft Diameter
- 11 mm (0.43 in)
- Application
- Engine Cooling System
- Installation
- Direct OEM Replacement
What’s in the Box
- 1 x Water Pump Impeller (433935)
Installation Notes
- Disconnect the battery and ignition system.
- Remove the lower unit from the outboard motor.
- Unbolt and remove the water pump housing.
- Note the orientation of the old impeller vanes before removing it.
- Remove the old impeller, key, and any gaskets.
- Clean the inside of the housing and the wear plate.
- Install the new impeller key (if applicable) on the drive shaft.
- Slide the new impeller onto the shaft, aligning the keyway.
- Rotate the driveshaft clockwise while pushing the housing down to correctly seat the vanes.
- Reinstall the housing, ensuring a proper seal, and reattach the lower unit.
- Test the cooling system on the water at a safe idle speed before full operation.
Troubleshooting & FAQ
How do I know if my outboard needs a new impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, or a visible decrease in cooling performance. Regular inspection is key.
How often should I replace my water pump impeller?
For preventative maintenance, it's recommended to replace the impeller every 1-2 years or every 100-200 hours of use, whichever comes first. This can vary based on operating conditions (e.g., saltwater vs. freshwater).
Will this impeller fit a 4-stroke model?
No, this impeller is specifically designed for the 2-stroke Johnson/Evinrude models listed in the compatibility table. It will not work for 4-stroke engines.
What happens if I install the impeller with the vanes bent the wrong way?
Installing the vanes in the wrong direction will result in poor water flow or no flow at all, leading to rapid engine overheating. Always rotate the driveshaft clockwise during installation to correctly bend the vanes inside the housing.
Are gaskets or a key included?
This package contains only the water pump impeller. Keys and gaskets are not included and should be purchased separately if your old ones are worn or lost.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
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