Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933)
Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933) 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
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
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Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces ...
Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933) is backordered and will ship as soon as it is back in stock.
Product Details
This complete Water Pump Impeller Kit – Fits Johnson/Evinrude 35–60 HP (Replaces 439077, 396933) provides everything needed to restore your cooling system. It's designed for a wide range of Johnson/Evinrude 2-stroke outboard engines from 35–60 HP, covering models from 1979–1994, including various commercial versions.
This kit serves as a direct aftermarket replacement for Johnson/Evinrude part numbers 439077, 396933, 390770, 396932, 391635, and 777808. It also interchanges with Sierra 18-3399 and Mallory 9-48204 or 9-48207.
- Engineered for direct OEM-level fit and function.
- Features a corrosion-resistant marine-grade metal alloy housing for durability.
- Includes a high-performance 6-blade neoprene rubber impeller for reliable water flow.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 439077 |
| Johnson/Evinrude | 396933 |
| Johnson/Evinrude | 390770 |
| Johnson/Evinrude | 396932 |
| Johnson/Evinrude | 391635 |
| Johnson/Evinrude | 777808 |
| Sierra | 18-3399 |
| Mallory | 9-48204 |
| Mallory | 9-48207 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This kit is designed for the specified Johnson/Evinrude outboard models. Please verify your horsepower, year, and original part number before ordering.
| Brand | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|
| Johnson/Evinrude | 35 | 2-Stroke | 1986–1987 | 439077 | |
| Johnson/Evinrude | 40 | 2-Stroke | 1984–1988 | 439077 | Not for models with Lever Operated Gas Assist Tilt |
| Johnson/Evinrude | 45 | 2-Stroke | 1986–1994 | 439077 | |
| Johnson/Evinrude | 45 Commercial | 2-Stroke | 1986–1988, 1990–1994 | 439077 | |
| Johnson/Evinrude | 48 | 2-Stroke | 1987–1988 | 439077 | |
| Johnson/Evinrude | 50 | 2-Stroke | 1979–1988 | 439077 | Not for models with Lever Operated Gas Assist Tilt |
| Johnson/Evinrude | 55 | 2-Stroke | 1979–1981, 1983–1984, 1986–1994 | 439077 | |
| Johnson/Evinrude | 55 Commercial | 2-Stroke | 1986–1988, 1990–1994 | 439077 | |
| Johnson/Evinrude | 60 | 2-Stroke | 1979–1988 | 439077 | Not for models with Lever Operated Gas Assist Tilt |
Technical Specs
- Product Type
- Water Pump Impeller Kit with Housing
- Installation
- Direct OEM replacement
- Housing Material
- Marine-grade metal alloy, corrosion resistant
- Housing Color
- Silver/Gray
- Other Technical Attributes
- High-performance neoprene rubber impeller with 6 blades
- Warranty
- 1 year (JLM Marine, BARTOO, UANOFCN); may vary by vendor
What’s in the Box
- 1 x Water Pump Housing (384087)
- 1 x Impeller (396809)
- 1 x Wear Plate (320981)
- 1 x Gasket (336530)
- 1 x O-Ring (303059)
- 1 x Grommet (315837)
- 2 x Screw, Short (319126)
- 2 x Screw, Long (909533)
- 1 x Seal (315748)
- 1 x Pump Cup/Liner (320775)
- 1 x Water Tube Guide/Bracket (315838)
- 1 x Grommet, Housing (341732)
- 1 x Key (331901)
- 1 x Key (344470)
Installation Notes
- Disconnect the battery and shift the outboard into neutral.
- Remove the propeller and the lower unit (gearcase) bolts, then carefully lower the unit to expose the driveshaft.
- Unbolt and remove the old water pump housing assembly. Note the orientation of the old parts as you remove them.
- Clean the driveshaft and mounting surfaces thoroughly, removing any old gasket material or debris.
- Assemble the new kit components. Lightly grease the pump cup/liner and install the new seal, wear plate, and gasket.
- Slide the new woodruff key into the driveshaft slot, then install the new impeller, ensuring the vanes are oriented correctly (curved against the direction of rotation).
- Install the new housing, O-ring, and grommet. Secure it with the provided short and long screws.
- Guide the water tube into the pump grommet and carefully reinstall the lower unit, ensuring the driveshaft splines align.
- Bolt the lower unit back in place, reinstall the propeller, and reconnect the battery.
- Start the engine and immediately check the tell-tale outlet for a strong, steady stream of water.
Troubleshooting & FAQ
How do I know if my water pump is failing?
Common signs include a weak or intermittent water stream from the tell-tale (peephole) outlet, frequent engine overheating alarms, steam from the exhaust, or a melted/damaged impeller upon inspection.
How often should I replace the water pump impeller?
For preventative maintenance, it is recommended to inspect and replace the impeller kit every 1-2 years or every 100-200 hours of engine use, depending on operating conditions (especially in saltwater or sandy/silty water).
What is the most common installation mistake to avoid?
Two common errors are forgetting to install the woodruff key before sliding the impeller on the driveshaft, and installing the impeller with its vanes curved in the wrong direction. The vanes should bend in the opposite direction of the driveshaft's clockwise rotation to function correctly.
Does this kit fit models outside the listed year ranges?
No. This kit is specifically designed for the models and years listed in the compatibility table. Outboard manufacturers often make small changes that affect part compatibility, so it is critical to match your engine's details to the chart.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement, not an original equipment manufacturer (OEM) component. It is built in an ISO 9002 certified facility to meet or exceed OEM-level specifications using comparable materials and is batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free to most locations; expedited options, where available, will appear at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal marine use. If you encounter an issue, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. See our official policy page for more details.
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 quality control.
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