Water Pump Impeller – Fits Evinrude/Johnson 40-75 HP (Replaces 382547, 765431, 777824)
Water Pump Impeller – Fits Evinrude/Johnson 40-75 HP (Replaces 382547, 765431, 777824) 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 Evinrude/Johnson 40-75 HP (Replaces 3825...
Product Details
This is a high-quality aftermarket Water Pump Impeller – Fits Evinrude/Johnson 40-75 HP (1975-1978), designed for 3-cylinder outboard motors requiring a replacement for part number 382547. It ensures proper engine cooling, preventing overheating and potential engine damage.
This impeller is a direct replacement for OEM part numbers OMC 382547, 765431, and 777824, as well as aftermarket parts like Sierra 18-3072 and JLM Marine 17IO0131.
- Engineered for direct installation.
- Designed for raw water cooling systems.
- Includes one high-durability rubber impeller.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| OMC | 382547_obsolete |
| OMC | 765431 |
| OMC | 777824 |
| Sierra | 18-3072 |
| JLM Marine | 17IO0131 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Evinrude & Johnson outboards, this part fits specific 3-cylinder models within the 40-75 HP range manufactured between 1975 and 1978.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Johnson | 3-Cylinder | 40 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 50 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 55 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 60 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 65 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 70 | 2-Stroke | 1975–1978 | 382547 |
| Johnson | 3-Cylinder | 75 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 40 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 50 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 55 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 60 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 65 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 70 | 2-Stroke | 1975–1978 | 382547 |
| Evinrude | 3-Cylinder | 75 | 2-Stroke | 1975–1978 | 382547 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct replacement
- Housing Material
- Rubber
- Housing Color
- Black
- Other Technical Attributes
- Designed for raw water cooling systems
What’s in the Box
- 1 x Water Pump Impeller (Replaces 382547/765431/777824)
Installation Notes
- Disconnect the battery and remove the engine cover.
- Shift the outboard into neutral.
- Remove the bolts securing the lower unit (gearcase) to the upper driveshaft housing.
- Carefully lower the gearcase to access the water pump assembly.
- Unscrew the bolts for the water pump housing and remove it.
- Slide the old impeller off the driveshaft, noting the orientation of the keyway.
- Clean the interior of the pump housing and inspect it for wear or damage.
- Lubricate the new impeller and housing interior with a marine-grade grease or soap solution.
- Slide the new impeller onto the driveshaft, aligning the keyway. Turn the driveshaft clockwise to seat the vanes correctly.
- Reinstall the water pump housing, ensuring a proper seal.
- Reattach the lower unit to the engine, making sure the driveshaft and water tube align correctly.
- Once reassembled, start the engine in water and verify a strong, steady stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if my impeller needs replacing?
Common signs of a failing impeller include the engine running hotter than normal, a weak or intermittent water stream from the tell-tale (pee hole), or if the existing impeller's blades are cracked, brittle, or permanently set.
Will this fit my specific 1976 Johnson 70 HP motor?
Yes, this impeller is designed for all Evinrude and Johnson 3-cylinder outboards from 40 to 75 HP manufactured between 1975 and 1978. Always double-check your model and year against the compatibility chart before ordering.
What is the recommended replacement interval?
As a best practice, inspect your impeller annually and plan to replace it every 1-2 years. If you operate in saltwater, silty, or sandy conditions, more frequent replacement (every year) is recommended to ensure reliability.
What are the signs of incorrect installation?
The most immediate sign is a lack of water pumping from the tell-tale outlet upon starting the engine. This can be caused by incorrectly seated impeller vanes (from turning the driveshaft counter-clockwise during installation) or a poor seal on 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.
Payment & Security
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