338632 Thermostat Cover for Johnson Evinrude | JLM Marine

Thermostat Cover for Johnson Evinrude 90-175 HP V4 V6 Eagle Series – OEM 338632

This thermostat cover is designed as a direct replacement for Johnson/Evinrude outboard engines rated at 90–175 HP in the V4 and V6 Eagle Series. Engineered to meet OEM specifications, this cover ensures proper thermostat function and cooling system integrity.

Replaces OEM part number 338632 (also known as 0338632). Compatible with 60-degree thermostat configurations commonly found in these engine families.

• Fits Johnson/Evinrude V4 and V6 Eagle Series engines
• Designed for 60° thermostat applications
• One thermostat cap per package

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 × Thermostat Cover (Cap)

Installation Guide

1. Allow the engine to cool completely before beginning work on the cooling system.
2. Disconnect the battery to prevent accidental ignition during installation.
3. Drain coolant or be prepared to catch any residual fluid when removing the old cover.
4. Remove the fasteners securing the old thermostat cover and carefully lift it away from the housing.
5. Inspect the thermostat and housing surfaces for damage, corrosion, or debris; clean thoroughly.
6. Install a new gasket or O-ring (if applicable) onto the thermostat housing or cover.
7. Position the new thermostat cover onto the housing, ensuring proper alignment with mounting holes.
8. Hand-tighten the fasteners first, then torque evenly in a cross pattern to manufacturer specifications.
9. Refill the cooling system with the appropriate coolant or water mixture as specified by the engine manual.
10. Reconnect the battery and start the engine, allowing it to reach operating temperature.
11. Check for leaks around the thermostat cover and verify proper coolant circulation.
12. If you have any questions about fitment or installation, consult your local dealer before proceeding.

Troubleshooting & FAQ

Q: How do I confirm this thermostat cover fits my Johnson/Evinrude engine?
A: Cross-reference your engine's model and HP rating with the compatibility table above. Verify that your engine uses OEM part number 338632 or 0338632. If your engine is a V4 or V6 Eagle Series (90–175 HP) with a 60° thermostat, this cover should fit.

Q: What are the signs that my thermostat cover needs replacement?
A: Common symptoms include coolant leaks around the thermostat housing, overheating due to compromised seal integrity, visible cracks or corrosion on the cover, and loss of coolant pressure. Replace the cover if you notice any of these issues.

Q: Does this cover include a gasket or O-ring?
A: This package includes the thermostat cover only. Depending on your engine's design, you may need to purchase a gasket or O-ring separately. Inspect your old cover to determine what sealing components are required.

Q: Can I reuse the old fasteners when installing this cover?
A: You may reuse the original fasteners if they are in good condition (no corrosion, stripped threads, or damage). However, replacing fasteners during maintenance is often recommended to ensure a secure, leak-free seal.

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.