Sierra 18-2546-9 Thermostat Gasket for Johnson/Evinrude V6 Outboard Engines, OEM 321184, Pack of 2

The Sierra 18-2546-9 Thermostat Gasket seals the thermostat cover on Johnson/Evinrude V6 outboard engines, preventing coolant leaks at the cover-to-housing joint so the cooling system maintains proper pressure and circulation. Each package contains two gaskets, giving you a spare on hand for the next service interval or a second engine. The gasket is molded from plastic and is designed as a direct fit for the thermostat cover assembly on applicable V6 outboards, correlating to OEM part number 321184.

This gasket is a wear item that should be replaced any time the thermostat cover is removed, whether during a thermostat replacement, cooling system inspection, or general engine service, since reusing a compressed or hardened gasket can allow coolant to seep past the cover and lead to overheating or reduced coolant flow. Installation is straightforward: remove the thermostat cover, clean the mating surfaces of old gasket material, position the new 18-2546-9 gasket, and reinstall the cover per the engine's service procedure. Sierra manufactures this part to meet or exceed the specifications of the original equipment part it replaces, making it a reliable choice for engine owners and marine service shops maintaining Johnson/Evinrude V6 outboards.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2546-9
• Product Type: Thermostat Cover Gasket
• Package Quantity: 2 gaskets per pack
• Material: Plastic
• Color: No Color
• Engine Compatibility: Johnson/Evinrude V6 outboard engines
• OEM Cross Reference: 321184
• UPC: 808282162818
• Weight: 0.03 pounds

Fitment

• Johnson/Evinrude V6 outboard engines

Replaces (OEM)

• 321184

Frequently Asked Questions

What does the Sierra 18-2546-9 gasket fit? The Sierra 18-2546-9 is designed for the thermostat cover on Johnson/Evinrude V6 outboard engines.

How many gaskets come in a pack? Each package of the Sierra 18-2546-9 contains two thermostat cover gaskets.

Is the 18-2546-9 gasket the same as OEM part 321184? Yes, the Sierra 18-2546-9 corresponds to OEM part number 321184 and is built to meet or exceed the original equipment specification.

What material is the thermostat gasket made from? The 18-2546-9 gasket is made of plastic, matching the material used for the original thermostat cover gasket.

When should I replace this gasket? Replace the 18-2546-9 gasket any time the thermostat cover is removed, such as during a thermostat swap or cooling system service, since a reused gasket can leak coolant.

How much does the gasket weigh? The Sierra 18-2546-9 thermostat gasket pack weighs 0.03 pounds.

Is this a genuine Sierra part or an aftermarket copy? The 18-2546-9 is a genuine Sierra part manufactured to meet or exceed the specification of the original equipment part it replaces.

Do I need any other parts to complete a thermostat cover reseal? The 18-2546-9 package supplies the two thermostat cover gaskets; the thermostat itself and other cover hardware are separate parts not included in this package.

What color is the gasket? The Sierra 18-2546-9 gasket has no distinct color, consistent with its plastic construction.

Is installation of the 18-2546-9 gasket difficult? No special tools are needed; installation involves removing the thermostat cover, cleaning the mating surfaces, and fitting the new 18-2546-9 gasket before reinstalling the cover.