Water Pump Impeller for Evinrude/Johnson OMC 35–55 HP Outboards – Cross-References 377230, 777213, 777821
Water Pump Impeller for Evinrude/Johnson OMC 35–55 HP Outboards – Cross-References 377230, 777213, 777821 is backordered and will ship as soon as it is back in stock.
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Water Pump Impeller for Evinrude/Johnson OMC 35–55 HP Outboards – C...
Water Pump Impeller for Evinrude/Johnson OMC 35–55 HP Outboards – Cross-References 377230, 777213, 777821 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket water pump impeller is listed for Evinrude, Johnson, and OMC outboards in the 35–55 HP range. The company fitment record covers 35 HP models from 1958–1959, 40 HP models from 1960–1970, and 50 HP and 55 HP models from 1971–1978.
Use the original impeller, engine model, year, and water-pump dimensions to confirm compatibility before ordering. This listing is for one impeller only; it is not a complete water-pump kit.
- Aftermarket replacement water-pump impeller.
- Designed for the cooling-system water pump in listed Evinrude, Johnson, and OMC applications.
- Reference dimensions: approximately 2.750 in outside diameter and 0.625 in inside diameter.
- Water-pump key is not included; confirm whether the original key is serviceable or order the required key separately.
Part Number Matrix
The following manufacturer and aftermarket numbers are cataloged as reference numbers for this impeller. Number formats may include leading zeros.
| Brand or source | Reference number |
|---|---|
| Johnson/Evinrude/OMC | 377230 |
| Johnson/Evinrude/OMC | 777213 |
| Johnson/Evinrude/OMC | 777821 |
| Sierra | 18-3083 |
| Mallory | 9-45209 |
Engine & Model Compatibility
Compatibility is organized by horsepower and model year. Because the available fitment record does not identify every individual model designation or serial-number range, compare your engine identification and original impeller before installation.
| Brand | Model coverage | Rated HP | Years | Reference number | Notes |
|---|---|---|---|---|---|
| Evinrude / Johnson / OMC | Various models | 35 | 1958–1959 | 377230, 777213, 777821 | Confirm the exact model and water-pump dimensions. |
| Evinrude / Johnson / OMC | Various models | 40 | 1960–1970 | 377230, 777213, 777821 | Confirm the exact model and water-pump dimensions. |
| Evinrude / Johnson / OMC | Various models | 50 | 1971–1978 | 377230, 777213, 777821 | Confirm the exact model and water-pump dimensions. |
| Evinrude / Johnson / OMC | Various models | 55 | 1971–1978 | 377230, 777213, 777821 | Confirm the exact model and water-pump dimensions. |
Technical Specifications
- Product type
- Water pump impeller
- Construction
- Rubber impeller with a drive hub
- Approximate outside diameter
- 2.750 in (69.85 mm)
- Approximate inside diameter
- 0.625 in (15.88 mm)
- Application
- Evinrude, Johnson, and OMC outboard water-pump applications listed above
- Installation
- Replacement in the water-pump housing after confirming the original part and dimensions
What’s in the Box
- 1 x Water pump impeller
- Water-pump key not included
Installation Notes
- Disconnect the battery and follow the engine manufacturer's service procedure.
- Remove the lower unit or water-pump housing as required for your specific engine.
- Remove the old impeller and inspect the housing, wear plate, drive key, and driveshaft for wear or damage.
- Clean the pump housing and confirm that the replacement impeller matches the original diameter and hub configuration.
- Install the drive key if required and position the impeller on the driveshaft.
- Lubricate the impeller with a suitable water-based or marine-safe lubricant recommended for impeller installation. Do not install it dry.
- Refit the pump housing, setting the vanes in the correct direction as the driveshaft is turned in its normal rotation.
- Reassemble the lower unit and all removed components according to the engine service instructions.
- Test the cooling-water flow using an adequate water supply before operating the outboard.
Troubleshooting & FAQ
How do I confirm fitment for my engine?
Match the manufacturer, horsepower, model year, and original impeller reference number. Also compare the approximately 2.750 in outside diameter and 0.625 in inside diameter. If your model or serial-number range is not clearly identified, consult the engine service manual before ordering.
Does this listing include the water-pump key?
No. This listing contains one impeller only. The key is not included, so inspect the existing key and replace it separately if it is worn or damaged.
What are common signs of a worn impeller?
Common signs include weak cooling-water flow, overheating, or an intermittent tell-tale stream. A damaged impeller can also leave rubber fragments in the cooling system. Stop operation if the engine overheats and inspect the cooling system.
How often should an impeller be replaced?
Replacement timing depends on engine use, storage conditions, and the manufacturer's maintenance schedule. Inspect the impeller regularly and replace it if the vanes are cracked, hardened, deformed, missing, or show signs of wear.
Can I run the outboard without water?
No. Never run an outboard dry. Use the correct flush attachment with a reliable water supply or test the engine in the water. Dry operation can damage the impeller within seconds.
Is this an OEM part?
No. This is an aftermarket replacement impeller. The listed manufacturer and aftermarket numbers are reference numbers used to help compare the original application.
Safety & Important Information
- Verify the exact engine model, year, original part number, and dimensions before ordering.
- Do not rely on horsepower alone to determine compatibility.
- Follow the engine manufacturer's service instructions and use appropriate safety procedures.
- Do not operate the engine without an adequate water supply.
- Professional installation is recommended when the lower unit or cooling system is unfamiliar.
About Sea Sierra
- Marine replacement parts — Practical replacement components for common marine-service applications.
- Application-focused listings — Fitment information is presented by brand, horsepower, and model year where available.
- Value-oriented solutions — Aftermarket alternatives for routine marine maintenance and repair.
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