Water Pump Impeller – Fits Johnson/Evinrude 28-75 HP (Replaces 396725, 389557)
Water Pump Impeller – Fits Johnson/Evinrude 28-75 HP (Replaces 396725, 389557) 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
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Johnson/Evinrude 28-75 HP (Replaces 3967...
Product Details
This Water Pump Impeller – Fits Johnson/Evinrude 28-75 HP (Replaces 396725) is engineered for Johnson/Evinrude 28-75 HP 2-stroke and 4-stroke outboard engines manufactured between 1979 and 2005. It is also compatible with many F-Type Gear Case models, including select E-Tec engines.
It serves as a direct replacement for Johnson/Evinrude part numbers 396725 and 389557, as well as aftermarket equivalents including Sierra 18-3053-1, GLM 89710, and Mallory 9-45207.
- Installs as a direct OEM replacement part.
- Constructed from durable, high-performance neoprene with a solid brass hub.
- Bi-directional design is compatible with both standard and counter-rotating engines.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 396725 / 389557 |
| Sierra | 18-3053-1 |
| GLM | 89710 |
| Mallory | 9-45207 / 9-45207-10 |
| CEF | 500303C |
| AM | AM396725 |
| HJB-O | 117 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This impeller fits a wide range of Johnson/Evinrude outboards, including E-Tec models. Please note it is not compatible with E-Tec 60HO, AF 65 HP, or AF 60 HP Jet Drive models. Always verify with your service manual for final confirmation.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 28 HP | 2-Stroke | Up to 2005 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 40 HP | 2-Stroke | 1999 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 40 HP | 4-Stroke | 1995–2005 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 45 HP | 4-Stroke | COM (large housing) | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 50 HP | 2-Stroke | 1998 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 55 HP | 2-Stroke | 1998 & Up | 396725 | MFE Models |
| Johnson/Evinrude | Various | 60 HP | 2-Stroke | 1986 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 60 HP | 4-Stroke | 1989–2001 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 60/70 HP | 4-Stroke | 1998 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 65 HP | 2-Stroke | Commercial 1984 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 65 HP | 4-Stroke | 1979–2001 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 70 HP | 2-Stroke | 1979 & Up | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 70 HP | 4-Stroke | 1979–1994 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | Various | 75 HP | 2-Stroke | 1979–1988 | 396725 | F-Type Gear Case |
| Johnson/Evinrude | E-Tec | 40 HP | 2-Stroke | 2006 & Newer | 396725 | F-Type Gear Case |
| Johnson/Evinrude | E-Tec | 50 HP | 2-Stroke | 2006 & Newer | 396725 | F-Type Gear Case |
| Johnson/Evinrude | E-Tec | 60 HP | 2-Stroke | 2006 & Newer | 396725 | F-Type Gear Case |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Material
- Neoprene with Brass Hub
- Number of Blades
- 6
- Dimensions
- Height: 25.4 mm (1"), Overall Diameter: 91.5 mm (3.6"), Hub Diameter: 19.13 mm (0.75")
- Weight
- 30g (1.06 oz)
- Color
- Black/Brass
- Operating Temperature
- -30°C to 120°C (-22°F to 248°F)
- Other Technical Attributes
- Bi-directional design works with both standard and counter-rotating engines
What’s in the Box
- 1 x Water Pump Impeller (396725)
Installation Notes
- Disconnect the spark plug leads and shift the engine into neutral.
- Remove the bolts securing the gearcase (lower unit) to the engine's midsection.
- Carefully lower and remove the gearcase assembly. Be mindful of the shift shaft linkage.
- Unbolt and lift the water pump housing to expose the impeller. Note the orientation of the old impeller's blades.
- Remove the old impeller, key, and gaskets. Thoroughly clean the housing interior and wear plate.
- Place the new key in the driveshaft groove and slide the new impeller down, turning the driveshaft clockwise to seat the blades correctly.
- Apply a light coat of marine grease or soapy water to the inside of the housing.
- Reinstall the water pump housing, ensuring a proper seal. Torque bolts to manufacturer specifications.
- Reinstall the gearcase, aligning the driveshaft, shift shaft, and water tube.
- Test the engine in a suitable water source, confirming that water is exiting the tell-tale port.
Troubleshooting & FAQ
How do I verify this impeller is the right one for my engine?
The best method is to compare the part number (396725) with your engine's service manual. You can also use the compatibility table on this page as a guide, but always double-check your existing part's dimensions and part number before ordering.
What are signs of a bad or failing impeller?
Common symptoms include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alarms, and reduced engine performance at high RPMs.
How often should I replace my water pump impeller?
As a preventative maintenance item, most manufacturers recommend replacing the impeller every 1-2 years or every 100-200 hours of use, whichever comes first. This interval can be shorter if operating frequently in saltwater, silty, or sandy conditions.
Does this impeller work for both standard and counter-rotating engines?
Yes, this impeller features a bi-directional design, allowing it to function correctly in both standard (clockwise) and counter-rotating (left-hand) lower units.
My new impeller blades are slightly bent out of the box. Is it defective?
No, this is normal. The neoprene blades are flexible and will straighten out and function correctly once installed and spinning inside the pump housing.
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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