Thermostat Repair Kit – Fits Mercury/Mariner 2-Stroke 6-25 HP (Replaces 14586A3, 75692A9/A10/A11)

Thermostat Repair Kit – Fits Mercury/Mariner 2-Stroke 6-25 HP (Replaces 14586A3, 75692A9/A10/A11)

This thermostat repair kit is designed for Mercury and Mariner 2-stroke outboard engines with 6-25 HP, covering models from 1986 through 1998 and beyond. It fits Standard, Sea Pro, and Super series engines, providing reliable temperature regulation within the engine cooling system.

The kit serves as a direct replacement for several OEM part numbers to ensure proper fit and function.

• Includes thermostat, seal/ring rubber, cover gasket, and gasket components
• Compatible with 2-stroke engine models from Mercury/Mariner
• Simple direct replacement installation

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 Mercury owners, heres a guide to help you identify your engines 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 Thermostat Seal/Ring Rubber (62386001/27-62386)
• 1 x Thermostat Cover Gasket (14318/27-14318-3)
• 1 x Thermostat Gasket (19205/27-19205-1)

Installation Guide

1. Ensure the engine is cool and the ignition is off before beginning installation.
2. Drain the cooling system to prevent water spillage during thermostat replacement.
3. Remove the thermostat cover and carefully extract the old thermostat and gaskets.
4. Clean the thermostat housing surface to remove old gasket residue and debris.
5. Install the new thermostat ensuring it is oriented correctly according to the engine manufacturers specifications.
6. Replace the thermostat seal/ring rubber and gaskets included in the kit.
7. Reattach the thermostat cover and secure it with the original fasteners.
8. Refill the cooling system with fresh water or coolant as recommended by the engine manual.
9. Start the engine and monitor the temperature gauge to confirm proper thermostat operation.
10. Check for leaks around the thermostat housing after installation.
11. If any issues arise, shut off the engine and re-check the installation steps.

Troubleshooting & FAQ

• How do I confirm this fits my engine? Confirm your engine model and year against the compatible engine models table above, matching the serial range where applicable.
• Is this thermostat the same as the OEM part? 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.
• How often should I replace the thermostat? Replacement is generally recommended if your engine shows signs of overheating or if the thermostat fails to open at the specified temperature (120°F/50°C). Regular maintenance intervals vary by usage and environment.
• What are common signs of thermostat failure? Symptoms include engine overheating, fluctuating temperature gauge readings, or poor engine performance due to incorrect cooling.
• How fast do you ship and how much does it cost? 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.
• What is your warranty and return policy? 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.