Sierra 18-3862 Head Gasket, Replaces Mercury Marine 27-41246-1

The Sierra 18-3862 Head Gasket is a replacement head gasket engineered for Mercury outboard engines, designed to seal the cylinder head against the engine block and maintain proper compression and cooling passage integrity. As a Sierra part, it is built to meet or exceed the quality of the original equipment part it replaces, giving outboard owners a dependable option when servicing or rebuilding a powerhead. The gasket is finished in white and is supplied as a single unit for installation during head removal, cylinder work, or general engine maintenance.

This head gasket is intended for use where the original Mercury Marine 27-41246-1 head gasket was fitted, and it is cataloged under Sierra's Mercury Outboard Head Gaskets line. Installers should replace the head gasket any time the cylinder head is removed, since gaskets are single-use components that will not reseal properly if reinstalled. Keeping the correct gasket on hand ensures a proper seal is restored and helps prevent compression loss, coolant leaks, or exhaust leaks after reassembly.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-3862
• Product Type: Head Gasket
• Color: White
• UPC: 030999753700
• Weight: 0.17 pounds
• Unit Count: 1
• Category: Mercury Outboard Head Gaskets

Fitment

Fits Mercury outboard applications originally equipped with the Mercury Marine 27-41246-1 head gasket.

Replaces (OEM)

• 27-41246-1

Frequently Asked Questions

What does the Sierra 18-3862 Head Gasket fit? The Sierra 18-3862 Head Gasket is designed for Mercury outboard engines that originally used the Mercury Marine 27-41246-1 head gasket, and it is listed under Sierra's Mercury Outboard Head Gaskets category.

Is the Sierra 18-3862 the same as Mercury Marine 27-41246-1? Yes, the Sierra 18-3862 Head Gasket is a direct replacement for Mercury Marine part number 27-41246-1 and is built to meet or exceed the quality of that original equipment gasket.

How much does the 18-3862 head gasket weigh? The Sierra 18-3862 Head Gasket weighs 0.17 pounds.

How many gaskets come in a package? One Sierra 18-3862 Head Gasket is included per unit, sold as a single gasket.

What color is the Sierra 18-3862 Head Gasket? This head gasket has a white finish.

Can I reuse my old head gasket instead of buying the 18-3862? No, head gaskets such as the Sierra 18-3862 are single-use seals and should be replaced with a new gasket any time the cylinder head is removed to ensure a proper seal.

Is the Sierra 18-3862 genuine OEM or aftermarket? The Sierra 18-3862 Head Gasket is a Sierra-manufactured replacement part, made to meet or exceed the quality of the original Mercury Marine 27-41246-1 equipment gasket it replaces.

What is the UPC for the Sierra 18-3862 Head Gasket? The UPC for the Sierra 18-3862 Head Gasket is 030999753700.

When should the 18-3862 head gasket be replaced? The Sierra 18-3862 Head Gasket should be installed new any time the cylinder head is removed from the Mercury outboard powerhead for service or rebuilding.

What category does the 18-3862 gasket belong to? Sierra part 18-3862 is cataloged in the Mercury Outboard Head Gaskets category.