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

Product Details

This Thermostat Repair Kit – Fits Mercury/Mariner 2-Stroke 6-25 HP (Replaces 14586A3, 75692A9/A10/A11) is designed for a precise fit on Mercury and Mariner 6–25 HP 2-stroke outboard engines from 1986 to 1998 and newer, including Standard, Sea Pro, and Super models. It ensures your engine maintains the correct operating temperature for optimal performance and longevity.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, including Mercury 14586A3, 75692A9/A10/A11, Sierra 18-43052, and Mallory 9-43052.

• Installation Method: Direct Replacement
• Operating Temperature: 120°F (50°C)
• Includes: Thermostat, seals, and gaskets for a complete service

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Mercury/Mariner engines, verify your serial number to ensure correct fitment, as ranges can vary by manufacturing location (USA, BEL, CAN).

Technical Specs

Product Type

Thermostat Repair Service Kit

Installation

Direct Replacement

Temperature Rating

120°F (50°C)

Operating Temperature

120°F (50°C) nominal

Housing Material

Metal, Plastic, Stainless Steel

Weight

0.06 kg (0.13 lb)

Warranty

30 days (GHmarine); 1 year (JLM Marine)

What’s in the Box

• 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 Notes

1. Ensure the engine is completely cool before beginning. Disconnect the battery for safety.
2. Locate the thermostat housing on the engine block. Place a drain pan underneath to catch any coolant.
3. Remove the bolts securing the thermostat cover. You may need to gently tap the cover to break the seal.
4. Note the orientation of the old thermostat before removing it from the housing.
5. Clean the mating surfaces of the housing and cover, removing all old gasket material.
6. Install the new thermostat in the correct orientation. Place the new gasket and seals in position.
7. Reinstall the thermostat cover and tighten the bolts to the manufacturer's specified torque. Do not overtighten.
8. Reconnect the battery, refill coolant if necessary, and check for leaks after starting the engine.

Troubleshooting & FAQ

Safety & Important Info

• Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
• This is an aftermarket replacement, not an OEM component.
• Professional installation is recommended for safety and performance.

About Sea Sierra

• Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
• Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
• Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.