143°F (62°C) Thermostat – Fits OMC Johnson/Evinrude 55-75 HP (Replaces 396987, 382385)

143°F (62°C) Thermostat – Fits OMC Johnson/Evinrude 55-75 HP (Replaces 396987, 382385)

This marine thermostat is engineered to operate at a precise 143°F (62°C), ensuring optimal engine temperature for a wide range of OMC Johnson/Evinrude outboard motors. It is designed as a direct replacement part for 55, 60, 65, 70, and 75 HP models manufactured between 1968 and 1988.

This component directly replaces OEM and aftermarket part numbers from multiple brands, including OMC, Sierra, GLM, Volvo Penta, Chrysler/Force, and Mercruiser, providing broad compatibility.

• Operating Temperature: Maintains a consistent 143°F (62°C) for stable engine performance.
• Installation: Designed for direct replacement of your original thermostat.
• Cross-Brand Compatibility: Fits various Johnson/Evinrude, Chrysler/Force, Mercruiser, and Volvo Penta engines.

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.

For all other brands, confirm your engine model/year in the tables below.

OMC Johnson/Evinrude

Chrysler/Force

Mercruiser

Volvo Penta

Technical Specifications

Package Contents

• 1 x Thermostat (Replaces 396987, 382385)

Installation Guide

1. Safety First: Ensure the engine is cool and disconnect the battery.
2. Drain Coolant: Drain a sufficient amount of coolant from the system to prevent spills.
3. Locate Housing: Find the thermostat housing on the engine block or cylinder head.
4. Remove Housing: Loosen and remove the bolts securing the housing cover.
5. Remove Old Thermostat: Take out the old thermostat and any existing gasket material.
6. Clean Surfaces: Thoroughly clean the mating surfaces of the housing and engine block.
7. Install New Thermostat: Place the new thermostat in position, ensuring it is correctly oriented.
8. Install Gasket: Place the new gasket (sold separately) onto the housing.
9. Reassemble: Reattach the housing cover and tighten the bolts to the manufacturer's specified torque.
10. Refill System: Refill the cooling system with the appropriate coolant.
11. Check for Leaks: Reconnect the battery, start the engine, and let it reach operating temperature while checking carefully for any leaks.

Troubleshooting & FAQ

Q: How do I confirm this thermostat fits my engine?

A: The most reliable method is to match your engine's original part number to one of the numbers listed in our Part Number Cross-Reference table. Additionally, review the Compatible Engine Models tables to ensure your specific model and year range are listed.

Q: What are the common symptoms of a bad thermostat?

A: A faulty thermostat can cause the engine to overheat if it's stuck closed or run too cool if it's stuck open. You may notice your temperature gauge reading is unusually high, low, or fluctuates erratically.

Q: Is a gasket included with this thermostat?

A: No, this package contains only the thermostat. The required gasket must be purchased separately to ensure a proper seal during installation.

Q: OEM vs. 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.