Water Pump Impeller Service Kit for Evinrude Johnson OMC 2-Stroke 5.5 HP, 6 HP and 7.5 HP Outboards

Product Details

This Water Pump Impeller Service Kit is intended for Evinrude, Johnson and OMC 2-stroke outboard applications. The company-listed fitment covers 5.5 HP models from 1954–1979, 6 HP models from 1954–1979, and 7.5 HP models from 1954–1958. The 7.5 HP application is specified for engines using a plastic pump housing.

The service part is associated with the following Johnson, Evinrude and OMC reference numbers: 763758, 391391, 382797, 389228, 379771 and 778166. Confirm the engine model, production year and existing water-pump configuration before ordering, especially for applications where housing style may vary.

• Water pump impeller service replacement for listed 2-stroke outboards
• Designed for the specified Evinrude, Johnson and OMC applications
• 7.5 HP fitment applies to models with a plastic pump housing
• Verify the original pump configuration and reference number before installation

Part Number Matrix

These are the manufacturer reference numbers listed for this application. They are provided for identification and fitment comparison.

Engine & Model Compatibility

Fitment is limited to the engine family, horsepower, years and configuration listed below. Match all applicable conditions with your engine before purchase.

Technical Specs

Product Type

Water pump impeller service kit

Application

Evinrude, Johnson and OMC 2-stroke outboards

Compatible Horsepower

5.5 HP, 6 HP and 7.5 HP

Listed Year Range

5.5 HP: 1954–1979; 6 HP: 1954–1979; 7.5 HP: 1954–1958

Housing Requirement

Plastic pump housing specified for the listed 7.5 HP application

Reference Numbers

763758, 391391, 382797, 389228, 379771 and 778166

What's in the Box

The company record identifies this product as a water pump service kit but does not provide a detailed component or quantity list. Do not assume that a pump housing, wear plate, seals, gaskets, key or hardware is included unless it is shown in the product images or confirmed by the seller. Compare the supplied parts with the original assembly before installation.

Installation Notes

1. Confirm the engine model, year, horsepower, 2-stroke configuration and water-pump reference number before beginning work.
2. Disconnect the fuel supply, remove the engine cowling as needed, and follow the manufacturer's service procedure for lower-unit removal.
3. Remove the lower unit and expose the water-pump assembly without damaging mating surfaces, the driveshaft or the shift linkage.
4. Remove the existing impeller and inspect the pump housing, wear surfaces, key, gaskets and seals for damage or excessive wear.
5. Clean all mating surfaces and remove debris before fitting the replacement service components.
6. Install the impeller in the correct direction and position, using the original key and only the components confirmed for your application.
7. Reassemble the water-pump cover and lower unit according to the engine manufacturer's service instructions.
8. Tighten fasteners to the manufacturer's specified torque and confirm that the driveshaft and shift linkage operate correctly.
9. Test the engine in an appropriate test tank or with suitable flushing equipment, and verify a steady cooling-water discharge before normal operation.

Troubleshooting & FAQ

How do I know if my water pump impeller needs replacement?

Common warning signs include weak or absent cooling-water discharge, overheating, steam or an unexpectedly high operating temperature. Inspect the impeller whenever cooling performance changes and follow the maintenance interval specified for your engine.

Will this service kit fit a metal pump housing?

The company-listed 7.5 HP application specifically requires a plastic pump housing. Housing compatibility is not established for every listed engine, so compare your existing pump assembly and reference number before ordering rather than relying on horsepower alone.

Does the package include a complete water-pump housing assembly?

The company record does not provide a confirmed package-content list or state that a housing is included. Confirm the pictured and supplied components before assuming that the housing, wear plate, key, seals or hardware are part of the package.

Can I install the impeller myself?

Installation requires lower-unit removal and correct reassembly of the water-pump system. It may be suitable for an experienced DIY mechanic with the correct service information and tools. If you are unfamiliar with outboard lower-unit service, professional installation is recommended.

Which reference numbers are associated with this application?

The listed Johnson, Evinrude and OMC reference numbers are 763758, 391391, 382797, 389228, 379771 and 778166. Match the complete engine and pump configuration as well as the number.

How often should a water-pump impeller be replaced?

Replacement intervals vary by engine manufacturer and operating conditions. Inspect the impeller according to the engine service schedule and replace it sooner if the engine operates in sandy, silty or debris-filled water or shows reduced cooling flow.

What should I do if the service kit does not match my engine?

Do not force the part into place or continue installation. Recheck the engine model, year, horsepower, stroke, pump housing style and reference number against the part. Contact support before installation if any of these details do not match.

Safety & Important Info

• Keep the engine model, year, horsepower, stroke and pump-housing conditions together when confirming fitment.
• Verify the original reference number and compare the pump configuration before ordering.
• Do not operate an outboard with weak or absent cooling-water flow; overheating can cause serious engine damage.
• Follow the engine manufacturer's service instructions and torque specifications.
• Because the detailed package contents are not specified in the company record, confirm included components before installation.

About Sea Sierra

• Marine replacement parts selected for practical repair and maintenance applications.
• Product information is organized around verified application details and manufacturer reference numbers.
• Always match the complete engine and water-pump configuration before installation.