438592 Water Pump Repair Kit for Johnson Evinrude 40HP 50HP | JLM Marine

438592 Water Pump Repair Kit for Johnson Evinrude 40HP 50HP | JLM Marine

This comprehensive water pump repair kit is engineered to fit Johnson and Evinrude 40HP and 50HP outboard engines manufactured between 1995 and 2005. Designed as a direct aftermarket replacement for OEM part number 438592, this kit ensures reliable cooling system performance and extends the service life of your outboard motor.

The kit serves as a direct replacement for Johnson Evinrude OEM part 438592, providing a cost-effective solution for routine maintenance or emergency repairs. Each kit includes essential cooling system components and complementary maintenance parts to support complete lower unit servicing.

• Includes water pump repair kit, thermostat, fuel filter, anode, drain screw gaskets, and gear oil pump
• Fits both 40HP and 50HP models from 1995 to 2005
• Complete maintenance package for lower unit and cooling system service

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

This complete maintenance package includes the following components:

• 438592 - Water Pump Repair Kit x1
• 436195 - Thermostat x1
• 329830 - Thermostat Gasket x1
• 0398319 - Fuel Filter x1
• 436745 - Anode x1
• 311598 - Drain Screw Gasket x2
• 24OP149 - Gear Oil Pump x1

Note: This package includes essential cooling system and lower unit maintenance components for a comprehensive service.

Installation Guide

1. Preparation: Disconnect the fuel line and remove the lower unit from the outboard motor following your engine's service manual. Drain all existing gear oil completely.
2. Remove Old Water Pump: Disassemble the water pump housing by removing mounting bolts and carefully extract the old impeller, wear plate, and gaskets.
3. Clean All Surfaces: Thoroughly clean the pump housing, drive shaft, and mating surfaces to remove old gasket material, corrosion, and debris.
4. Install New Components: Apply a thin layer of marine grease to the impeller vanes and insert the new impeller into the housing, ensuring blades are oriented in the correct rotation direction.
5. Replace Gaskets and Seals: Install all new gaskets, O-rings, and seals from the kit in their proper positions. Do not reuse old gaskets.
6. Replace Thermostat: Remove the old thermostat and install the new 436195 thermostat with the new 329830 gasket, ensuring proper sealing.
7. Install Fuel Filter: Replace the existing fuel filter with the included 0398319 fuel filter, ensuring fuel flow direction is correct.
8. Replace Anode: Install the new 436745 anode to provide corrosion protection for metal components.
9. Drain Screw Service: Replace both drain screw gaskets (311598) to prevent gear oil leakage.
10. Fill Gear Oil: Using the included 24OP149 gear oil pump, fill the lower unit with the manufacturer-recommended gear oil until it flows from the upper vent hole.
11. Reassemble Lower Unit: Reinstall the lower unit to the motor, torquing all fasteners to manufacturer specifications. Reconnect the fuel line.
12. Test Operation: Start the engine in a test tank or on the water and verify proper water flow from the telltale indicator. Check for leaks and proper operating temperature.

Troubleshooting & FAQ

Q: How do I know if my water pump needs replacement?
A: Common signs include reduced or no water flow from the telltale indicator, engine overheating, steam from the engine, or decreased performance. Water pumps should be inspected annually and replaced every 2-3 years or 200-300 hours of operation as preventive maintenance.

Q: Will this kit fit my specific Johnson or Evinrude engine?
A: This kit is designed for 40HP and 50HP Johnson Evinrude outboards manufactured between 1995 and 2005. Verify your engine's model year and horsepower rating before ordering. You can use the Johnson/Evinrude serial number guide linked above to confirm compatibility.

Q: Why does this kit include a fuel filter and anode?
A: This is a comprehensive maintenance package designed for complete lower unit servicing. The fuel filter ensures clean fuel delivery, the anode provides corrosion protection, and the drain screw gaskets prevent oil leaks—all items typically replaced during major lower unit maintenance.

Q: How often should I replace the water pump?
A: Manufacturers typically recommend water pump replacement every 2-3 years or every 200-300 hours of operation, whichever comes first. If you operate in sandy or silty water, more frequent replacement may be necessary.

Q: Can I install this kit myself or do I need a mechanic?
A: Installation requires moderate mechanical skill, including removing the lower unit and disassembling the water pump housing. If you have basic marine engine repair experience and proper tools, DIY installation is feasible by following your engine's service manual. Otherwise, professional installation is recommended.

Q: What's the difference between this aftermarket kit and the OEM version?
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.