Sierra Cylinder Head Gasket for Mercury Mariner Outboard

The Sierra Cylinder Head Gasket is a replacement head gasket for Mercury and Mariner outboard engines. It seals the joint between the cylinder head and the engine block. That seal keeps combustion pressure in and keeps coolant and oil in their passages. A fresh gasket restores compression and helps prevent leaks and overheating after head removal or service.

Key Features:

• Aftermarket replacement head gasket made for Mercury and Mariner outboard engines
• Seals combustion gases, coolant passages, and oil passages between the head and block
• Helps restore proper compression and cooling system integrity
• Made for marine use, including heat cycling and exposure to water
• Sierra is a long-established marine engine parts brand known for replacement parts for outboard, sterndrive, and inboard engines

Each part number in this product line is made for a specific engine application. Use the individual item listings to choose the right gasket for your outboard. Replace the head gasket whenever the cylinder head is removed. Use clean, flat mating surfaces and tighten the head bolts to the engine manufacturer's torque specification and sequence.