396725, 432594, 437080 Water Pump Impeller for Johnson Evinrude | JLM Marine

Water Pump Impeller for Johnson Evinrude 40HP-75HP Outboard Motors

This high-quality water pump impeller is designed to fit Johnson/Evinrude outboard motors ranging from 40HP to 75HP. Engineered to meet OEM specifications, this impeller ensures reliable cooling system performance and helps prevent engine overheating during operation.

This aftermarket impeller directly replaces OEM part numbers 396725, 432594, and 437080, as well as aftermarket equivalents including Sierra 18-3053 and CEF 500303. It provides a cost-effective solution for maintaining your outboard's water pump system.

• Compatible with Johnson/Evinrude 40HP, 50HP, 55HP, 60HP, 65HP, 70HP, and 75HP outboard motors
• Direct replacement for multiple OEM and aftermarket part numbers
• Ensures proper water circulation to prevent engine overheating

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 Impeller

Installation Guide

1. Disconnect the fuel line and remove the propeller for safety. Tilt the engine to access the lower unit.
2. Drain the lower unit gear oil completely by removing the drain and vent screws.
3. Remove the water pump housing bolts and carefully separate the lower unit from the mid-section.
4. Remove the old water pump housing and impeller from the drive shaft. Inspect the housing for wear or damage.
5. Clean all mating surfaces thoroughly, removing old gasket material and debris.
6. Lubricate the new impeller blades with glycerin or water-resistant grease to aid installation.
7. Install the new impeller onto the drive shaft, ensuring the blades are oriented in the correct rotation direction.
8. Replace the impeller plate and install a new gasket on the water pump housing.
9. Carefully reassemble the lower unit to the mid-section, aligning the drive shaft and water tube properly.
10. Torque all mounting bolts to manufacturer specifications in a cross-pattern sequence.
11. Refill the lower unit with the appropriate gear oil and reinstall drain/vent screws.
12. Test the engine with a water supply (muffs or tank) to confirm proper water flow from the telltale indicator.

Troubleshooting & FAQ

Q: How do I know if my water pump impeller needs replacement?
A: Common signs include overheating, reduced or no water flow from the telltale (indicator stream), steam from the engine, or the engine running hotter than normal. Impellers should typically be inspected annually and replaced every 2-3 years or sooner if damaged.

Q: How can I confirm this impeller fits my specific Johnson/Evinrude engine?
A: Cross-reference your current impeller's part number with the OEM numbers listed (396725, 432594, 437080, 0396725, or 432952). You can also verify compatibility using your engine's horsepower rating (40-75HP) and consult the Johnson/Evinrude serial number guide linked above.

Q: What's the difference between this aftermarket impeller and the OEM version?
A: This aftermarket impeller is manufactured to OEM specifications using comparable materials and quality standards. It delivers equivalent performance at a more competitive price point, making it an economical alternative without sacrificing reliability.

Q: How often should I replace my outboard's water pump impeller?
A: Most manufacturers recommend replacing the impeller every 2-3 years or every 300 hours of operation, whichever comes first. If you frequently operate in sandy or silty water, or if the engine sits unused for extended periods, more frequent replacement may be necessary.

Q: Can I install this impeller myself or do I need a professional?
A: While experienced boat owners with mechanical aptitude can perform this replacement, it requires separating the lower unit and proper reassembly techniques. If you're unfamiliar with outboard maintenance, professional installation is recommended to ensure correct alignment and prevent leaks.

Q: Is this an OEM part or an aftermarket replacement?
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.