Water Pump Impeller – Fits Johnson/Evinrude 1.5–6 HP (Replaces 382221, 766433)
Water Pump Impeller – Fits Johnson/Evinrude 1.5–6 HP (Replaces 382221, 766433) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
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Water Pump Impeller – Fits Johnson/Evinrude 1.5–6 HP (Replaces 3822...
Product Details
This Water Pump Impeller fits Johnson/Evinrude 1.5–6 HP Outboards, providing a reliable solution for restoring your engine's cooling system. It is specifically designed for 1.5–6 HP 2-Stroke outboard motors manufactured between 1967 and 1984, including 1.5 HP (1967–1984), 2 HP (1973–1975), 4 HP models with a 90° gearcase (1973–1975), and 6 HP models (1979).
This impeller serves as a direct replacement for Johnson/Evinrude part numbers 382221, 0382221, 766433, and 0766433, as well as Mercury/Mariner 47-80395M.
- Installs directly into the lower unit water pump assembly.
- Made from high-quality neoprene rubber with a durable nylon hub for longevity.
- Package includes one impeller and the necessary drive shaft key pin for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 382221 / 0382221 |
| Johnson/Evinrude | 766433 / 0766433 |
| Mercury/Mariner | 47-80395M |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | 1.5 | 2-Stroke | 1967–1984 | 382221/0382221, 766433/0766433 | |
| Johnson/Evinrude | 2 | 2-Stroke | 1973–1975 | 382221/0382221, 766433/0766433 | |
| Johnson/Evinrude | 4 | 2-Stroke | 1973–1975 | 382221/0382221, 766433/0766433 | 90° gearcase models only |
| Johnson/Evinrude | 6 | 2-Stroke | 1979 | 382221/0382221, 766433/0766433 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Lower Unit Water Pump Assembly
- Connection
- Drive Shaft Key/Pin
- Dimensions
- 47.9 mm diameter × 14 mm height (1.89 in × 0.55 in)
- Fitting Type
- Drive Shaft Hub
- Other Technical Attributes
- 6 blades, Neoprene rubber with nylon hub construction
What’s in the Box
- 1 × Water Pump Impeller (Replaces 382221, 766433)
- 1 × Drive Shaft Key Pin (Replaces 0306196/306196)
Installation Notes
- Disconnect the an battery and shift the outboard into neutral.
- Remove the lower unit (gearcase) by unbolting it from the main engine housing.
- Locate and open the water pump housing, which is typically secured by several bolts.
- Note the rotational direction of the old impeller's blades before removal.
- Remove the old impeller, gaskets, and wear plate. Thoroughly clean all mating surfaces.
- Install the new wear plate and gaskets.
- Slide the new impeller onto the drive shaft, making sure to align it with the keyway before inserting the new key.
- While pressing the housing down, gently rotate the drive shaft clockwise to correctly fold the new impeller blades.
- Secure the water pump housing with its bolts, tightening them to the manufacturer's specified torque.
- Reinstall the lower unit and test the engine in water, ensuring a steady stream from the tell-tale port.
Troubleshooting & FAQ
How do I know if this impeller fits my engine?
This impeller is made for specific Johnson/Evinrude 1.5–6 HP outboards (1967–1984). Please use the "Engine & Model Compatibility" table to check your engine's HP, year, and other details like '90° gearcase' to confirm it's a match.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or no water stream from the "tell-tale" port, engine overheating alarms, or a noticeable reduction in cooling performance at various speeds.
How often should I replace my outboard's impeller?
For preventative maintenance, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of use. More frequent replacement may be necessary if you operate in sandy or silty water.
Is the drive shaft key pin included?
Yes, the package includes one new drive shaft key pin (Part No. 0306196/306196), which is required for proper installation on the drive shaft.
Does this fit a 1974 Johnson 4 HP outboard?
Possibly. This impeller fits 4 HP models made between 1973–1975, but only if they are equipped with the 90° gearcase. Please confirm your gearcase design before purchasing.
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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