Thermostat Kit 143° – Fits Johnson/Evinrude 60-75 HP (Replaces 396987, 382385)

Thermostat Kit 143° – Fits Johnson/Evinrude & Mercury 60-125 HP

This thermostat kit is designed for a range of 2-stroke outboard motors, including Johnson/Evinrude 60, 65, 70, and 75 HP models, as well as various Mercury/Mariner 3-cylinder and 4-cylinder engines.

It serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring compatibility and reliable performance for maintaining optimal engine operating temperature.

• Installation Type: Direct replacement for original stock parts.
• Operating Temperature: Kit features a 143°F thermostat, which begins to open at 122°F (50°C).
• Engine Application: Fits select 3-cylinder (L3) and 4-cylinder (L4) loop-charged carbureted 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.

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Thermostat (14586)
• 1 x Rubber Ring (27-62386, 27-62386001, 27-8M0204714)
• 1 x Gasket (27-43006-8)
• 1 x Washer (12-47533)

Installation Guide

1. Ensure the engine is completely cool before starting. Disconnect the battery for safety.
2. Locate the thermostat housing on the engine block or cylinder head.
3. Place a drain pan beneath the housing and carefully remove the housing cover bolts.
4. Gently pry the cover loose. Note the orientation of the old thermostat before removing it.
5. Remove the old thermostat and gasket. Clean both the housing and cover surfaces thoroughly.
6. Install the new thermostat in the correct orientation, followed by the new gasket and seals from the kit.
7. Re-install the housing cover and tighten the bolts to the manufacturer's specified torque.
8. Reconnect the engine's cooling hoses and the battery.
9. Start the engine and check for any leaks around the housing as it comes up to temperature.

Troubleshooting & FAQ

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

A: The best way is to cross-reference your engine's model and serial number with the compatibility tables provided. You can also verify that the OEM part numbers listed (e.g., 396987, 382385 for Johnson/Evinrude) match the part you are replacing.

Q: What is the operating temperature of this unit?

A: This is a 143°F rated thermostat. It is designed to start opening at 122°F (50°C) to allow coolant to circulate and maintain proper engine temperature.

Q: What are the common signs of a failing thermostat?

A: Key symptoms include engine overheating, especially at higher speeds, or running too cool at idle, which can lead to poor performance and fuel efficiency. You may also notice erratic readings on your temperature gauge.

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.