Water Pump Impeller Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP (Replaces 763758, 391391, 778166)
Water Pump Impeller Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP (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
Free standard shipping on all orders under 1 KG
Water Pump Impeller Kit – Fits Johnson/Evinrude 5.5HP, 6HP, 7.5HP (...
Product Details
This complete Water Pump Impeller Kit is designed for Johnson and Evinrude 5.5HP and 6HP (1954–1979) and 7.5HP (1954–1958) 2-stroke outboard motors that are equipped with plastic pump housings. The kit provides all the essential components to restore your engine's cooling system performance.
It directly replaces OEM part numbers 763758, 391391, 778166, 382797, 389228, and 379771, offering a reliable and cost-effective alternative to factory parts.
- Installs in the lower unit of the outboard motor.
- Engineered specifically for models with plastic pump housings.
- Includes a neoprene impeller, housing, wear plate, gaskets, and hardware.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 763758 |
| Johnson/Evinrude | 391391 |
| Johnson/Evinrude | 778166 |
| Johnson/Evinrude | 382797 |
| Johnson/Evinrude | 389228 |
| Johnson/Evinrude | 379771 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Johnson outboards, this kit fits 5.5 HP, 6 HP, and 7.5 HP models across various years as detailed in the compatibility list.
For Evinrude outboards, this kit fits 5.5 HP, 6 HP, and 7.5 HP models with the same year ranges and specifications.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson | Outboard | 5.5 | 2-Stroke | 1954–1979 | 763758 | With plastic pump housing |
| Johnson | Outboard | 6 | 2-Stroke | 1954–1979 | 763758 | With plastic pump housing |
| Johnson | Outboard | 7.5 | 2-Stroke | 1954–1958 | 763758 | With plastic pump housing |
| Evinrude | Outboard | 5.5 | 2-Stroke | 1954–1979 | 763758 | With plastic pump housing |
| Evinrude | Outboard | 6 | 2-Stroke | 1954–1979 | 763758 | With plastic pump housing |
| Evinrude | Outboard | 7.5 | 2-Stroke | 1954–1958 | 763758 | With plastic pump housing |
Technical Specs
- Product Type
- Water Pump Impeller Repair Kit
- Installation
- Lower Unit
- Housing Material
- Plastic
- Housing Color
- Black
- Impeller Material
- Neoprene Rubber
- Dimensions
- Complete kit: 6.02 × 4.02 × 2.05 inches (153 × 102 × 52 mm)
- Weight
- 7.4 ounces (210 g)
- Warranty
- 30-day refund/replacement
What’s in the Box
- 1 x Impeller
- 1 x Pump Housing
- 1 x Pump Cup
- 1 x Wear Plate
- 1 x Gasket
- 1 x Grommet
- 1 x Bolt
- 4 x Screws
Installation Notes
- Disconnect the spark plug leads and battery for safety. Drain the gearcase oil from the lower unit.
- Unbolt and carefully remove the lower unit (gearcase) from the outboard's midsection.
- Locate and unbolt the water pump housing to expose the old impeller and components.
- Remove the old impeller, gaskets, wear plate, and housing. Clean all mating surfaces thoroughly.
- Install the new gasket and wear plate onto the lower unit.
- Slide the new impeller onto the driveshaft. Turn the shaft clockwise to help seat the impeller vanes correctly inside the new pump cup and housing.
- Install the new pump housing and tighten the bolts to the manufacturer's specified torque.
- Reinstall the lower unit, ensuring the driveshaft, shift shaft, and water tube are correctly aligned.
- Refill the gearcase with the correct grade and amount of marine gear lubricant.
- Reconnect the spark plug leads and battery. Test run the engine on a water supply, confirming a steady stream of water from the tell-tale outlet.
Troubleshooting & FAQ
How do I know if this kit fits my motor?
This kit is specifically for Johnson/Evinrude 5.5HP & 6HP (1954–1979) and 7.5HP (1954–1958) models that have a plastic water pump housing. The best way to confirm fitment is to check your engine's OEM part number against those listed in our Part Number Matrix.
What are the signs of a failing water pump impeller?
The most common symptoms are engine overheating at idle or low speeds, and a weak or non-existent water stream from the engine's "tell-tale" cooling outlet. Visual inspection during maintenance may also reveal cracked, brittle, or missing vanes on the old impeller.
How often should I replace my water pump impeller?
As a crucial part of preventative maintenance, it is recommended to inspect the impeller annually and replace it every 1-2 years or after 100-200 hours of operation. Replacement intervals should be shorter for engines used frequently in saltwater or silty/sandy conditions.
Is this a complete kit for the job?
Yes, this kit includes all the core components needed for a standard water pump service: the impeller, housing, cup, wear plate, gasket, grommet, and mounting hardware as listed in the "What's in the Box" section.
What is the difference between an OEM and an aftermarket part?
This listing is an aftermarket replacement (not OEM). It has been built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are your shipping speeds and costs?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free for most orders; any available expedited shipping options and their costs will be displayed at checkout.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Unused items in their original condition can be returned within our standard window; please see our policy page or contact us for instructions.
Safety & Important Info
- Verify images and specifications against your original part before purchase. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement part, not an original equipment manufacturer (OEM) component.
- Professional installation is recommended for safety and performance to prevent engine damage.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and rigorously tested for real-world conditions.
- Fast Global Fulfillment — We offer free standard delivery to most regions, with an average transit time of 5–15 days.
- Manufacturer-Direct Value — By working directly with manufacturers, we provide fair pricing without compromising on materials or quality control.
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