Water Pump Impeller – Fits Johnson/Evinrude 55-75 HP Outboards (Replaces 765431, 382547)
Water Pump Impeller – Fits Johnson/Evinrude 55-75 HP Outboards (Replaces 765431, 382547) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Water Pump Impeller – Fits Johnson/Evinrude 55-75 HP Outboards (Rep...
Product Details
This Water Pump Impeller – Fits Johnson/Evinrude 55-75 HP Outboards (Replaces 765431, 382547) is a direct replacement for Johnson/Evinrude 2-Stroke outboard motors from 55 to 75 HP manufactured between 1968 and 1978. It is engineered to restore cooling system performance and prevent engine overheating.
It serves as a direct cross-reference for Johnson/Evinrude part numbers 765431/0765431, 382547/0382547, 777824/0777824, as well as aftermarket equivalents Sierra 18-3082, Mallory 9-45213, and GLM 89940.
- Installation Method: Direct replacement requiring no modifications.
- Durable Construction: Features a corrosion-resistant brass hub and robust neoprene impeller blades.
- Key Component: Includes the 6-blade impeller essential for a standard water pump service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 765431 / 0765431 |
| Johnson/Evinrude | 382547 / 0382547 |
| Johnson/Evinrude | 777824 / 0777824 |
| Sierra | 18-3082 |
| Mallory | 9-45213 |
| GLM | 89940 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson/Evinrude | Various | 55 | 2-Stroke | 1968–1969 | 765431/382547 | |
| Johnson/Evinrude | Various | 60 | 2-Stroke | 1970–1971 | 765431/382547 | |
| Johnson/Evinrude | Various | 65 | 2-Stroke | 1972–1973 | 765431/382547 | |
| Johnson/Evinrude | Various | 70 | 2-Stroke | 1974–1978 | 765431/382547 | |
| Johnson/Evinrude | Various | 75 | 2-Stroke | 1974–1978 | 765431/382547 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct Replacement
- Housing Material
- Brass Hub with Neoprene Blades
- Dimensions (Product)
- Height: 6.0 in; Width: 7.13 in; Length: 1.0 in
- Number of Blades
- 6
- Weight
- 97g (3.42 oz)
- Other Technical Attributes
- Brass hub construction for durability and corrosion resistance
What’s in the Box
- 1 x Water Pump Impeller (765431/382547)
Installation Notes
- Disconnect the engine's negative battery cable for safety.
- Place the outboard in forward gear and remove the bolts securing the lower unit (gearcase). Carefully separate the lower unit from the upper housing.
- Locate the water pump housing on top of the gearcase. Remove the housing bolts to access the impeller.
- Inspect the old impeller's orientation. Remove it, along with the Woodruff key if present.
- Thoroughly clean the inside of the pump housing and inspect it for scoring or damage.
- Apply a light coat of marine grease to the new impeller and inside the housing. Install the Woodruff key and slide the new impeller onto the driveshaft, turning it clockwise to bed the blades correctly.
- Reinstall the pump housing, ensuring a proper seal. Reattach the lower unit and test the cooling system at a safe idle speed.
Troubleshooting & FAQ
How do I know if this impeller fits my specific Johnson or Evinrude model?
This impeller is designed for the 55-75 HP range from 1968–1978. Always verify your engine's year and HP against the compatibility table. For confirmation, check if your existing part number matches any of the cross-reference numbers listed in our Part Number Matrix.
What are the signs of a failing water pump impeller?
Common symptoms include a weak or non-existent "telltale" water stream, engine overheating alarms, and in severe cases, steam from the exhaust. Reduced engine performance can also be a sign.
How often should I replace my impeller?
As a preventative maintenance item, most manufacturers recommend replacing the impeller every 1-2 years or every 100-200 hours of operation, whichever comes first. This interval can be shorter if you operate in sandy or silty water.
Is a brass hub better than a plastic one?
A brass hub generally offers superior durability and resistance to heat and corrosion compared to plastic or rubber hubs. It is less prone to spinning on the driveshaft under high-load conditions, providing a more reliable service life.
Can I install this myself?
While installation is possible for those with mechanical experience, it involves removing the lower unit. We recommend professional installation to ensure all components are sealed and aligned correctly for optimal cooling performance and to prevent engine damage.
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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