377230 777213 Impeller for Johnson Evinrude OMC | JLM Marine

Outboard Rubber Impeller – Fits Johnson Evinrude OMC 35-55 HP (1958-1978)

This high-quality aftermarket water pump impeller is engineered to fit Johnson Evinrude OMC outboard motors ranging from 35 HP to 55 HP manufactured between 1958 and 1978. Designed with a durable neoprene construction and brass hub insert, this impeller ensures reliable cooling system performance for your vintage outboard engine.

This impeller directly replaces OEM part numbers 377230, 0377230, and 777213, as well as aftermarket equivalent Sierra 18-3083. It provides a cost-effective solution for maintaining your engine's water pump without compromising on quality or fit.

• Includes impeller with key/pin for secure installation
• Neoprene construction with brass hub for durability and corrosion resistance
• 6-blade design ensures optimal water flow and cooling efficiency

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here's a guide to help you identify your engine's serial/model: Johnson/Evinrude Serial Number Guide.

Technical Specifications

Package Contents

• 1 × Outboard Rubber Impeller with Key / Pin

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor following your engine's service manual.
2. Remove the water pump housing cover and carefully extract the old impeller from the pump housing.
3. Inspect the pump housing, faceplate, and seals for wear, corrosion, or damage. Replace any worn components.
4. Lubricate the new impeller with glycerin or a water-resistant grease (never use petroleum-based lubricants).
5. Insert the key/pin into the impeller hub, aligning it with the drive shaft slot.
6. Carefully slide the impeller onto the drive shaft, ensuring the blades are positioned in the correct rotation direction.
7. Install the pump housing faceplate and secure it with the original fasteners, tightening to manufacturer specifications.
8. Reinstall the lower unit onto the outboard motor, ensuring all gaskets and seals are properly seated.
9. Reconnect the fuel line and water supply, then perform a test run to verify proper water flow from the tell-tale indicator.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my engine?
A: Cross-reference your engine's horsepower and model year with the compatibility table above. Verify your original impeller's part number (377230, 0377230, 777213, or Sierra 18-3083) and compare the dimensions—especially the hub diameter (0.630"/16mm) and outer diameter (2.740"/69.85mm)—to ensure a perfect match.

Q: How often should I replace my water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2-3 years or 200-300 hours of operation, whichever comes first. If you frequently operate in sandy or debris-filled water, inspect and replace more often to prevent cooling system failure.

Q: What are the signs that my impeller is failing?
A: Common symptoms include reduced or no water discharge from the tell-tale outlet, engine overheating, steam from the engine, or visible damage such as cracked, broken, or missing impeller blades during inspection.

Q: Can I use petroleum-based grease when installing this impeller?
A: No, never use petroleum-based lubricants as they will degrade the neoprene material. Always use glycerin, silicone grease, or water pump-specific lubricant during installation to preserve the impeller's integrity.

Q: Is this an OEM or aftermarket part?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.