Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP 2-Stroke Outboards (Replaces 763758, 391391, 778166)
Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP 2-Stroke Outboards (Replaces 763758, 391391, 778166) 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 Repair Kit – Fits Johnson/Evinrude 5.5HP, 6HP, ...
Water Pump Impeller Repair Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP 2-Stroke Outboards (Replaces 763758, 391391, 778166) is backordered and will ship as soon as it is back in stock.
Product Details
This complete water pump impeller repair kit is designed for selected Johnson and Evinrude 5.5HP and 6HP 2-stroke outboard motors from 1954–1979, and selected 7.5HP 2-stroke outboards from 1954–1958 that use a plastic water pump housing. The kit supplies the core components needed to service the lower-unit water pump and restore reliable cooling-system performance.
It is listed as a replacement for OEM reference numbers 763758, 391391, 778166, 382797, 389228, and 379771. Confirm the part number, housing style, engine year, and model details before ordering.
- Installs in the outboard lower unit.
- Designed for applications with a plastic water pump housing.
- Includes an impeller, pump housing, pump cup, wear plate, gasket, grommet, bolt, and screws.
- Aftermarket replacement part; not an original equipment manufacturer component.
Part Number Matrix
Use the following reference numbers to compare your existing water pump components and service information.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 763758 |
| Johnson/Evinrude | 391391 |
| Johnson/Evinrude | 778166 |
| Johnson/Evinrude | 382797 |
| Johnson/Evinrude | 389228 |
| Johnson/Evinrude | 379771 |
Engine & Model Compatibility
Fitment depends on the engine model, year, water-pump design, and plastic-housing configuration. Confirm the details on your outboard and compare the original component before purchase.
| Brand | Model | Rated HP | Stroke | Years | OEM Reference | Notes |
|---|---|---|---|---|---|---|
| Johnson | Outboard | 5.5 | 2-Stroke | 1954–1979 | 763758 | Plastic water pump housing |
| Johnson | Outboard | 6 | 2-Stroke | 1954–1979 | 763758 | Plastic water pump housing |
| Johnson | Outboard | 7.5 | 2-Stroke | 1954–1958 | 763758 | Plastic water pump housing |
| Evinrude | Outboard | 5.5 | 2-Stroke | 1954–1979 | 763758 | Plastic water pump housing |
| Evinrude | Outboard | 6 | 2-Stroke | 1954–1979 | 763758 | Plastic water pump housing |
| Evinrude | Outboard | 7.5 | 2-Stroke | 1954–1958 | 763758 | Plastic water pump housing |
Technical Specifications
- Product Type
- Water pump impeller repair kit
- Installation Location
- Outboard lower unit
- Housing Material
- Plastic
- Housing Color
- Black
- Impeller Material
- Neoprene rubber
- Package Dimensions
- 6.02 × 4.02 × 2.05 inches (153 × 102 × 52 mm)
- Package Weight
- 7.4 ounces (210 g)
- Warranty/Returns
- 30-day refund or replacement
What’s in the Box
- 1 × Impeller
- 1 × Pump housing
- 1 × Pump cup
- 1 × Wear plate
- 1 × Gasket
- 1 × Grommet
- 1 × Bolt
- 4 × Screws
Installation Notes
- Disconnect the spark plug leads and battery where applicable. Drain the gearcase lubricant from the lower unit.
- Unbolt and carefully remove the lower unit from the outboard midsection.
- Locate the water pump and remove the pump-housing fasteners to expose the old impeller and related components.
- Remove the old impeller, gaskets, wear plate, housing, and other components being replaced. Clean all mating surfaces thoroughly.
- Install the new gasket and wear plate on the lower unit.
- Slide the new impeller onto the driveshaft. Rotate the driveshaft clockwise as needed to seat the impeller vanes correctly inside the pump cup and housing.
- Install the new pump housing and tighten the fasteners to the outboard manufacturer’s specified torque.
- Reinstall the lower unit, ensuring that the driveshaft, shift shaft, and water tube are correctly aligned.
- Refill the gearcase with the correct marine gear lubricant and specified amount.
- Reconnect the spark plug leads and battery where applicable. Test-run the engine using an appropriate water supply and verify a steady cooling-water stream from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my motor?
This kit is intended for selected Johnson and Evinrude 5.5HP and 6HP 2-stroke outboards from 1954–1979 and selected 7.5HP 2-stroke outboards from 1954–1958 with a plastic water pump housing. Confirm your engine’s brand, horsepower, year, housing style, and OEM reference number before ordering.
What are the signs of a failing water pump impeller?
Common symptoms include overheating at idle or low speed and a weak or missing water stream from the cooling tell-tale outlet. Inspection may also reveal cracked, brittle, worn, or missing impeller vanes.
How often should I replace the water pump impeller?
Inspect the impeller as part of regular preventive maintenance. Replacement intervals depend on engine use, storage conditions, and water quality; more frequent service may be necessary for engines used in saltwater or sandy and silty conditions.
Is this a complete kit for the water pump service?
The kit includes the impeller, pump housing, pump cup, wear plate, gasket, grommet, bolt, and four screws listed in the package-contents section. Always compare the included components with the requirements of your specific outboard before disassembly.
Is this an OEM part?
No. This is an aftermarket replacement kit intended to replace the listed OEM reference numbers. It is not manufactured or sold as an original equipment manufacturer component.
What are the shipping speeds and costs?
Typical transit is 5–15 days. Standard shipping is free for most orders; available expedited options and their costs are displayed at checkout.
What is the warranty and return policy?
This product has a 30-day refund or replacement period. Contact support with your order details if you receive a damaged or defective item. Return eligibility may depend on the item’s condition and the applicable store policy.
Safety & Important Information
- Verify the engine model, year, horsepower, stroke, housing style, OEM reference, and original component before purchase.
- Do not operate an outboard without an adequate cooling-water supply.
- Follow the engine manufacturer’s service procedures and torque specifications.
- Professional installation is recommended when you are unfamiliar with lower-unit or water-pump service.
- This is an aftermarket replacement part, not an OEM component.
About Sea Sierra
- Pro-Grade Standards — We supply marine replacement parts selected for dependable performance in real-world service conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with typical transit times of 5–15 days.
- Manufacturer-Direct Value — We work with manufacturing partners to provide practical replacement solutions at competitive prices.
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