Water Pump Impeller – Fits Johnson/Evinrude/OMC V4 & V6 85-235 HP (Replaces 389642, 777212)
Water Pump Impeller – Fits Johnson/Evinrude/OMC V4 & V6 85-235 HP (Replaces 389642, 777212) 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/OMC V4 & V6 85-235 ...
Water Pump Impeller – Fits Johnson/Evinrude/OMC V4 & V6 85-235 HP (Replaces 389642, 777212) is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket Water Pump Impeller fits Johnson/Evinrude/OMC V4 & V6 85-235 HP outboard engines manufactured between 1973 and 1978. It is engineered from durable neoprene with a brass hub to ensure reliable performance and longevity in marine environments.
This component is a direct replacement for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 389642, 777212, and 385528, as well as Sierra 18-3043, CEF 500305, and others.
- Designed for direct OEM-equivalent installation.
- Constructed from high-quality neoprene for optimal flexibility and service life.
- Includes one water pump impeller.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 389642 |
| Johnson/Evinrude | 777212 |
| Johnson/Evinrude | 385528 |
| Sierra | 18-3043 |
| CEF | 500305 |
| Mallory Marine | 9-45203 |
| GLM | 89680 |
| SEI Marine | 96-399-07E |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
Fits various Johnson, Evinrude, and OMC V4/V6 models as specified in the compatibility list.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | V4 | 85 | 2-Stroke | 1973–1978 | 389642 | |
| Johnson/Evinrude | V4 | 115 | 2-Stroke | 1973–1978 | 389642 | |
| Johnson/Evinrude | V4 | 135 | 2-Stroke | 1973–1978 | 389642 | |
| Johnson/Evinrude | V4 | 140 | 2-Stroke | 1973–1978 | 389642 | |
| Johnson/Evinrude | V6 | 150 | 2-Stroke | 1977–1978 | 389642 | |
| Johnson/Evinrude | V6 | 175 | 2-Stroke | 1977–1978 | 389642 | |
| Johnson/Evinrude | V6 | 200 | 2-Stroke | 1976–1978 | 389642 | |
| Johnson/Evinrude | V6 | 235 | 2-Stroke | 1976–1978 | 389642 |
Technical Specs
- Product Type
- Outboard Water Pump Impeller
- Installation
- Direct OEM replacement
- Housing Material
- Rubber with brass hub
- Dimensions
- 90.5 mm diameter × 32.4 mm height (3.56 × 1.28 inches)
- Number of Blades
- 6
- Internal Hub Diameter
- 22.3 mm (0.88 inches)
- Weight
- 143 g (0.32 lbs)
- Other Technical Attributes
- Neoprene construction
What’s in the Box
- 1 x Water Pump Impeller (389642/777212)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Drain the lower unit gearcase oil.
- Remove the propeller assembly.
- Unbolt and carefully detach the lower unit (gearcase) from the outboard's driveshaft housing.
- Locate and unbolt the water pump housing cover.
- Lift the cover and slide the old impeller off the driveshaft, taking note of the drive key.
- Clean all gasket surfaces and inspect the housing and wear plate for scoring or damage.
- Install the new impeller, aligning it with the drive key, and rotate the driveshaft clockwise to seat the blades.
- Reassemble the pump housing, install a new gasket, and tighten bolts to the manufacturer-specified torque.
- Reinstall the lower unit, propeller, and refill with fresh gear lube.
- Reconnect the battery and test the engine in water to confirm proper water flow from the tell-tale.
Troubleshooting & FAQ
How do I know if this impeller fits my specific engine model?
This impeller fits Johnson/Evinrude V4 & V6 engines (85-235 HP) from 1973–1978. Always confirm your exact model and year against the compatibility table. Do not install if your model or year is not listed.
What are the signs of a failing water pump impeller?
Common signs include engine overheating alarms, a weak or non-existent water stream from the "tell-tale" outlet, and in some cases, a slight burning rubber smell if the impeller runs dry.
How often should I replace my impeller?
As a preventative maintenance measure, it is recommended to replace the impeller every 1-2 years or every 100-200 hours of operation, depending on usage conditions (e.g., saltwater vs. freshwater).
Is the drive key included in this package?
This package contains only the water pump impeller. The metal drive key is typically reused from the old impeller or can be purchased separately if needed.
Can I install this impeller myself?
Installation is possible for those with mechanical experience and the correct tools. However, due to the critical nature of the engine's cooling system, professional installation is recommended to ensure safety and correct function.
What is the difference between an OEM and aftermarket part?
This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality and consistency.
What are your shipping speed and cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders; expedited options will appear at checkout where available for your location.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window, provided the part is unused and in its 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 rigorously tested for real-world reliability.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — By working directly with our manufacturing partners, we provide fair pricing without compromising on materials or quality control.
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