377230 777213 Impeller for Johnson Evinrude OMC | JLM Marine

Water Pump Impeller 377230 777213 – Fits Johnson Evinrude OMC 35–55 HP Outboard Motors

This precision-engineered water pump impeller is designed to fit Evinrude Johnson OMC outboard motors ranging from 35 HP to 55 HP, covering model years 1958 through 1978. Engineered with a durable neoprene body and brass hub insert, this impeller ensures reliable cooling system performance for your vintage outboard engine.

This aftermarket replacement directly cross-references OEM part numbers 377230, 0377230, and 777213, as well as aftermarket equivalents such as Sierra 18-3083. It provides a cost-effective solution without compromising on quality or fitment.

• 6-blade design for optimal water flow and cooling efficiency
• Constructed from neoprene rubber with brass hub insert for durability and corrosion resistance
• Direct replacement for multiple Johnson Evinrude OMC horsepower ratings across two decades

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 Serial Number Guide.

Technical Specifications

Package Contents

Your purchase includes:

• 1 × Outboard Water Pump Impeller

Installation Guide

1. Disconnect the fuel line and remove the lower unit from the outboard motor following your service manual. Ensure the engine is cool and the spark plug wire is disconnected.
2. Remove the water pump housing by unscrewing the retaining bolts. Carefully lift the housing to expose the old impeller.
3. Extract the old impeller from the shaft using a flat-head screwdriver or impeller puller if needed. Inspect the housing and plate for scoring or damage.
4. Clean all sealing surfaces thoroughly, removing old gasket material, debris, and corrosion. Replace the base gasket and O-rings as needed.
5. Lubricate the new impeller with water-resistant marine grease or liquid soap to ease installation and prevent tearing during initial startup.
6. Install the new impeller onto the drive shaft, ensuring the blades face the correct direction (typically counterclockwise rotation). Align the brass hub with the drive pin.
7. Rotate the impeller blades in the proper direction by hand to confirm smooth rotation and proper blade flex.
8. Reinstall the water pump housing carefully, ensuring the impeller blades do not fold backward. Align all dowel pins and guide marks.
9. Torque the housing bolts evenly in a criss-cross pattern to the manufacturer's specifications to avoid warping.
10. Reattach the lower unit to the motor, reconnect all linkages, and refill the lower unit with the correct marine gear oil.
11. Test the cooling system by running the engine in a test tank or on muffs. Verify strong, steady water discharge from the tell-tale outlet.
12. Inspect for leaks around the pump housing and lower unit seals during the first few minutes of operation.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson or Evinrude engine?
A: Cross-reference your engine's horsepower and year with the compatibility table above. Your original impeller should match part numbers 377230, 0377230, or 777213. If your engine falls within 35–55 HP and years 1958–1978, this impeller is the correct fit.

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 notice overheating, weak tell-tale flow, or the engine has been run dry, replace the impeller immediately.

Q: What are the signs my impeller is failing?
A: Common symptoms include reduced or no water flow from the tell-tale, engine overheating, steam from the engine, or the temperature alarm sounding. Inspect the impeller if any of these occur.

Q: Can I install this impeller myself?
A: Yes, if you have basic mechanical skills and the proper tools. Follow your engine's service manual closely, as lower unit removal and reassembly procedures vary by model. Professional installation is recommended if you're unfamiliar with outboard service.

Q: What's the difference between this impeller and the OEM version?
A: This is an aftermarket replacement built to OEM specifications using comparable neoprene and brass materials. It delivers the same performance and fitment at a more economical price point, manufactured in an ISO9002-certified facility.

Q: Is this an OEM part or aftermarket?
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.