Water Pump Repair Kit for Johnson/Evinrude 50–55 HP 2-Stroke Outboards, 1971–1978
Water Pump Repair Kit for Johnson/Evinrude 50–55 HP 2-Stroke Outboards, 1971–1978 is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
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Water Pump Repair Kit for Johnson/Evinrude 50–55 HP 2-Stroke Outboa...
Water Pump Repair Kit for Johnson/Evinrude 50–55 HP 2-Stroke Outboards, 1971–1978 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump repair kit is designed for selected Johnson and Evinrude 50–55 HP 2-stroke outboard engines from 1971–1978. The application is for 2-cylinder and 3-cylinder Loopcharged engines using a small gearcase, small water pump, and half-moon-key impeller arrangement.
Use the original component number, engine model, horsepower, year, gearcase style, and key configuration to confirm compatibility before ordering. This product is not a general replacement for every Johnson/Evinrude 40–75 HP outboard.
- For selected Johnson/Evinrude 50–55 HP 2-stroke outboards.
- Application range: 1971–1978, subject to the specific engine model and gearcase configuration.
- For small gearcase and small water pump applications using a half-moon key impeller.
- Aftermarket replacement for service and cooling-system maintenance.
Part Number Matrix
The following manufacturer and aftermarket references are listed for identification and cross-reference purposes. Matching a number alone does not replace checking the complete engine application.
| Brand or Source | Reference Number | Reference Type |
|---|---|---|
| Johnson / Evinrude / OMC | 389133 | Manufacturer reference |
| Johnson / Evinrude / OMC | 387326 | Manufacturer reference |
| Johnson / Evinrude / OMC | 387217 | Manufacturer reference |
| Johnson / Evinrude / OMC | 777812 | Manufacturer reference |
| Johnson / Evinrude / OMC | 384956 | Manufacturer reference |
| OMC | 0389133, 0387326, 0387217, 0777812, 0384956 | Number-format variants |
| Sierra Marine | 18-3325 | Aftermarket reference |
| GLM | 12232, 12231 | Aftermarket reference |
| SEI Marine | 96-365-01AK | Aftermarket reference |
Engine & Model Compatibility
The confirmed application scope is narrower than a broad 40–75 HP listing. Verify all conditions together before installation.
| Brand | Horsepower | Stroke | Years | Configuration | Gearcase and Pump |
|---|---|---|---|---|---|
| Johnson / Evinrude | 50 HP | 2-Stroke | 1971–1978 | 2-cylinder or 3-cylinder Loopcharged application as specified for the engine | Small gearcase, small water pump, half-moon key impeller |
| Johnson / Evinrude | 55 HP | 2-Stroke | 1971–1978 | 2-cylinder or 3-cylinder Loopcharged application as specified for the engine | Small gearcase, small water pump, half-moon key impeller |
Technical Specs
- Product Type
- Aftermarket water pump repair kit
- Application
- Selected Johnson/Evinrude 50–55 HP 2-stroke outboards
- Year Range
- 1971–1978
- Engine Configuration
- 2-cylinder and 3-cylinder Loopcharged applications within the stated fitment
- Gearcase and Pump Configuration
- Small gearcase with small water pump
- Impeller Key Configuration
- Half-moon key type
What’s in the Box
This listing is for one water pump repair kit. The company product record does not provide a confirmed component-by-component quantity list, so do not assume that a housing, wear plate, gaskets, seals, or separate key are included unless they are shown in the current package or confirmed by the seller. Confirm the package contents against the product images and your service requirements before installation.
Installation Notes
- Confirm the engine model, horsepower, year, gearcase size, water pump style, and half-moon-key configuration before starting work.
- Disconnect the battery and follow the engine manufacturer’s service procedure for removing the lower unit.
- Remove the water pump cover and inspect the existing impeller, key, plate, housing, gaskets, and seals.
- Clean the mating surfaces and remove all damaged rubber or gasket material.
- Install the replacement components supplied with the repair kit. Do not reuse damaged or hardened service parts.
- Install the impeller with the correct half-moon key and confirm the impeller direction and seating.
- Reassemble the water pump and lower unit using the manufacturer’s torque and alignment procedures.
- Verify that the driveshaft, shift mechanism, and water tube are correctly aligned before tightening the lower-unit fasteners.
- Run the engine only in a suitable water source or with the correct flushing equipment, and confirm a strong, steady tell-tale stream before normal operation.
Troubleshooting & FAQ
How do I confirm that this repair kit fits my engine?
Check that your Johnson or Evinrude outboard is a 50–55 HP 2-stroke from 1971–1978 and that it uses the specified small gearcase, small water pump, and half-moon-key impeller. Then compare the original manufacturer reference and exact engine model with the references listed above.
Does this fit every 40–75 HP Johnson/Evinrude outboard?
No. The broad 40–75 HP claim is not supported by the product-specific company fitment. This listing is limited to the stated 50–55 HP, 1971–1978, 2-stroke applications and the specified small-gearcase water pump configuration.
What does the half-moon key specification mean?
The impeller is intended for a water pump shaft using a half-moon key. A wedge-key system, large gearcase, or different water pump design may require another service kit even when the horsepower appears similar.
What are the signs of a worn water pump impeller?
Common signs include a weak or missing tell-tale stream, overheating, temperature alarms, or visible damage to the impeller and water pump housing. Inspect the complete cooling system if overheating occurs.
How often should the impeller be serviced?
Follow the engine manufacturer’s maintenance schedule and inspect the impeller whenever the lower unit is serviced. Replace it sooner when the engine is used in saltwater, sand, silt, or other abrasive conditions.
Is this an OEM part?
No. This is an aftermarket replacement. The manufacturer and aftermarket numbers shown on this page are reference numbers used to help identify the intended application.
Are all gaskets, seals, and the key included?
The product-specific company record does not confirm a detailed component list. Review the current package contents and product images before ordering if you require a particular gasket, seal, housing, wear plate, or key.
Safety & Important Information
- Always verify the exact engine model, year, horsepower, stroke, gearcase, water pump style, and original reference number before purchase.
- Do not use this listing as a substitute for the manufacturer’s service manual.
- Do not operate an outboard without an adequate cooling-water supply.
- Stop operation immediately if the tell-tale stream is weak or the engine shows signs of overheating.
- Professional installation is recommended when lower-unit removal or water-pump service is unfamiliar.
About Sea Sierra
- Marine Replacement Parts — Practical aftermarket components for routine outboard service and repair.
- Application-Focused Listings — Fitment information is organized by engine configuration and service requirements.
- Clear Cross-References — Manufacturer and aftermarket reference numbers are provided to support accurate part identification.
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