377178;775519 Water Pump Impeller for Evinrude Johnson OMC BRP | JLM Marine

Water Pump Impeller – Fits Johnson Evinrude OMC BRP 9.5HP 10HP Outboard Motors

This high-quality water pump impeller is engineered to fit Johnson Evinrude OMC BRP outboard motors rated at 9.5HP and 10HP. Designed to maintain optimal cooling performance, this impeller ensures your engine operates at the correct temperature, protecting against overheating and extending the life of your outboard motor.

This aftermarket replacement directly replaces OEM part numbers 377178 and 775519, as well as Sierra part number 18-3003. Manufactured from premium neoprene rubber with a durable brass hub insert, it delivers reliable performance comparable to original equipment.

• Constructed with high-quality neoprene rubber and a brass hub for durability and corrosion resistance
• Precise dimensions: 69.00 mm (2.72") external diameter, 14.10 mm (0.56") internal shaft diameter
• Direct replacement for multiple OEM part numbers across Johnson, Evinrude, and OMC applications

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 package includes:

• 1 × Outboard Impeller

Installation Guide

1. Disconnect the fuel line and remove the spark plug wire to ensure the engine cannot start during maintenance.
2. Remove the lower unit from the outboard motor by loosening the mounting bolts and carefully sliding it downward.
3. Locate and remove the water pump housing cover to access the old impeller. Take note of the orientation and alignment.
4. Carefully extract the old impeller from the pump housing, checking for worn or broken blades that indicate the need for replacement.
5. Clean the pump housing thoroughly, removing any debris, old gasket material, or corrosion buildup.
6. Lubricate the new impeller with a water-resistant marine grease to ease installation and prevent blade damage.
7. Insert the new impeller into the housing, ensuring the blades are oriented in the correct rotation direction (usually marked on the housing).
8. Replace the water pump gaskets and seals with new ones to ensure a watertight seal and prevent leaks.
9. Reassemble the water pump housing cover, tightening bolts in a crisscross pattern to the manufacturer's specified torque.
10. Reinstall the lower unit onto the motor, aligning the driveshaft and water tube carefully, then secure all mounting bolts.
11. Reconnect the spark plug wire and fuel line, then test the engine in a water barrel or on the water to confirm proper cooling flow.
12. Inspect for leaks and verify that water is discharging from the tell-tale (pilot) hole, confirming successful installation.

Troubleshooting & FAQ

Q: How do I confirm this impeller fits my Johnson or Evinrude engine?
A: Cross-reference your engine's horsepower and year range with the compatibility table above. This impeller fits 9.5 HP models from 1964–1973 and 10 HP models from 1958–1963. Verify your original impeller's dimensions (69.00 mm external diameter, 14.10 mm internal shaft diameter) and confirm your OEM part number matches 377178 or 775519.

Q: How often should I replace my water pump impeller?
A: It is recommended to replace your impeller annually or every 200–300 hours of operation, whichever comes first. Impellers can degrade from heat, wear, and dry running, so regular replacement prevents overheating and costly engine damage.

Q: What are the signs that my impeller is failing?
A: Common symptoms include reduced or no water flow from the tell-tale hole, engine overheating, steam from the engine, or loss of power. If you notice any of these signs, inspect and replace the impeller immediately to avoid engine damage.

Q: Why does this impeller have a brass hub instead of a plastic one?
A: The brass hub provides superior durability and corrosion resistance compared to plastic, especially in saltwater environments. It ensures a secure fit on the driveshaft and reduces the risk of hub failure during operation, making it ideal for older Johnson and Evinrude models.

Q: Can I install this impeller myself, or do I need a professional?
A: If you have basic mechanical skills and the appropriate tools, you can install this impeller yourself by following the installation guide. However, professional installation is recommended if you are unfamiliar with lower unit disassembly to ensure proper alignment and sealing.

Q: What is the difference between OEM and aftermarket impellers?
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.