Water Pump Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 377230, 777213)
Water Pump Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 377230, 777213) 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 Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 3772...
Water Pump Impeller – Fits Johnson/Evinrude 35-55 HP (Replaces 377230, 777213) is backordered and will ship as soon as it is back in stock.
Product Details
This Water Pump Impeller – Fits Johnson/Evinrude 35–55 HP (Replaces 377230, 777213) is an essential replacement part for maintaining your engine's cooling system. It is specifically designed for Johnson/Evinrude 2-Stroke outboard models, including 35 HP (1958–1959), 40 HP (1960–1970), 50 HP with a small housing (1971–1978), and 55 HP (1971–1978) engines.
It serves as a direct interchange for multiple OEM and aftermarket part numbers, including Johnson/Evinrude 377230, 777213; Sierra 18-3083; Mallory 9-45209; and GLM 89660.
- Engineered for direct OEM replacement fit and function.
- Constructed from durable rubber with a brass hub for saltwater resistance.
- Includes one water pump impeller for a complete installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number |
|---|---|
| Johnson/Evinrude | 377230 / 0377230 |
| Johnson/Evinrude | 777213 / 0777213 |
| Sierra | 18-3083 |
| Mallory | 9-45209 |
| GLM | 89660 |
| CEF | 500352 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
This part is compatible with select Johnson outboards from 35 HP to 55 HP made between 1958 and 1978.
This part is compatible with select Evinrude outboards from 35 HP to 55 HP made between 1958 and 1978.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Johnson | Various | 35 | 2-Stroke | 1958–1959 | 377230/0377230 | With Thermostat |
| Johnson | Various | 40 | 2-Stroke | 1960–1970 | 377230/0377230 | |
| Johnson | Small Housing | 50 | 2-Stroke | 1971–1978 | 377230/0377230, 777213/0777213 | |
| Johnson | Various | 55 | 2-Stroke | 1971–1978 | 377230/0377230, 777213/0777213 | |
| Evinrude | Various | 35 | 2-Stroke | 1958–1959 | 377230/0377230 | With Thermostat |
| Evinrude | Various | 40 | 2-Stroke | 1960–1970 | 377230/0377230 | |
| Evinrude | Small Housing | 50 | 2-Stroke | 1971–1978 | 377230/0377230, 777213/0777213 | |
| Evinrude | Various | 55 | 2-Stroke | 1971–1978 | 377230/0377230, 777213/0777213 |
Technical Specs
- Product Type
- Water Pump Impeller
- Installation
- Direct OEM replacement
- Housing Material
- Rubber with Brass Hub
- Dimensions
- A: 16.04 mm (inner/shaft diameter), B: 69.80 mm (external diameter), C: 22.10 mm (height/thickness)
- Other Technical Attributes
- 6 blades; designed for salt water resistance
What’s in the Box
- 1 x Water Pump Impeller (377230/777213)
Installation Notes
- Disconnect the battery before starting work.
- Remove the lower unit (gearcase) from the outboard motor.
- Unscrew the bolts holding the water pump housing and lift it off.
- Inspect the housing and wear plate for scoring or damage, replacing if necessary.
- Remove the old impeller, noting the direction its blades are curved.
- Install the new impeller, twisting it in the direction of engine rotation to bend the blades correctly.
- Reassemble the water pump housing, lower unit, and all connections.
- Reconnect the battery and test the engine in water, ensuring a steady stream from the tell-tale.
Troubleshooting & FAQ
How do I know if this impeller fits my Johnson/Evinrude engine?
This impeller fits specific HP and year ranges: 35 HP (1958–1959), 40 HP (1960–1970), 50 HP with Small Housing (1971–1978), and 55 HP (1971–1978). Cross-reference your OEM part number (377230 or 777213) and check the "Engine & Model Compatibility" table. It is critical for the 50 HP models that your engine has the "Small Housing."
What are the signs of a failing water pump impeller?
Common signs include a weak or non-existent water stream from the "tell-tale" outlet, engine overheating alerts, and reduced engine performance. Visible signs on the old impeller include cracked, brittle, or missing blades.
How often should I replace the impeller?
As a preventative maintenance measure, it's recommended to replace your water pump impeller every 1–2 years or every 100–200 hours of use, whichever comes first. Frequency should increase if operating in sandy or silty water.
Is this impeller resistant to saltwater?
Yes, it is designed for marine environments and is built with a durable rubber composite and brass hub to resist corrosion from saltwater exposure.
What’s the difference between OEM and this aftermarket part?
This is an aftermarket replacement, not an OEM component. It has been engineered to meet or exceed original manufacturer specifications for fit, form, and function, using comparable materials. Our parts are manufactured in an ISO 9002 certified facility and are batch-inspected for quality assurance.
How fast is shipping?
We ship worldwide quickly, with typical transit times of 5–15 days for standard delivery. Standard shipping is free to most regions, with expedited options available at checkout.
What is the warranty and return policy?
This product is covered by a 1-year warranty against manufacturing defects under normal use. Should an issue arise, please contact our support team with your order details. Returns are accepted within our standard window for unused items in their original condition. 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 proceed.
- This is an aftermarket replacement component, not an OEM part.
- Professional installation is highly recommended for safety and optimal performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.
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