Sierra Exhaust Manifold Gasket 18-2717 for Mercury Outboard

The Sierra 18-2717 is an exhaust manifold gasket engineered for Mercury outboard engines. It seals the mating surface between the exhaust manifold and the powerhead, maintaining a tight seal against combustion gases and cooling water to prevent leaks that can lead to overheating, corrosion, or loss of engine performance. As a direct-fit replacement part, it is designed to restore the factory seal when servicing or rebuilding the exhaust manifold assembly on compatible Mercury outboard engines.

Installing a fresh gasket at this joint is a routine part of exhaust manifold maintenance, especially any time the manifold is removed for inspection, cleaning, or replacement. Using the correct gasket helps ensure proper sealing and reduces the risk of exhaust or water leaks that can damage surrounding engine components over time.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2717
• Product Name: Exhaust Manifold Gasket
• Category: Mercury Outboard Gaskets
• Weight: 0.05 pounds
• UPC: 808282145811

Frequently Asked Questions

What is the Sierra 18-2717 used for? The Sierra 18-2717 is an exhaust manifold gasket that seals the joint between the exhaust manifold and the powerhead on a Mercury outboard engine, preventing exhaust and water leaks at that connection.

Which engines does the 18-2717 gasket fit? The 18-2717 is designated for Mercury outboard engines; check your engine's manifold part number to confirm compatibility before ordering.

How much does the 18-2717 exhaust manifold gasket weigh? This gasket weighs 0.05 pounds, consistent with its role as a thin sealing component rather than a structural part.

Is the Sierra 18-2717 a genuine Sierra part? Yes, part number 18-2717 is a Sierra branded exhaust manifold gasket, sold under the Sierra name for marine engine service.

When should I replace the exhaust manifold gasket on my Mercury outboard? The 18-2717 gasket should be replaced any time the exhaust manifold is removed for service, or if you notice exhaust or water leakage at the manifold joint, since gaskets are single-use seals that should not be reused.

What is included when I order the 18-2717? Ordering the Sierra 18-2717 gets you one exhaust manifold gasket sized for the mating surface between the manifold and the powerhead on applicable Mercury outboard engines.

Can the 18-2717 gasket be reused after removal? No, like most engine gaskets, the 18-2717 is intended for one-time use and should be replaced with a new gasket whenever the exhaust manifold is disassembled.

What happens if I don't replace a worn exhaust manifold gasket? A worn or damaged gasket at the exhaust manifold joint, such as where the 18-2717 seals, can allow exhaust gas or cooling water to leak, potentially leading to overheating or corrosion of nearby engine components.

Is the 18-2717 gasket specific to Mercury outboards? Yes, the Sierra 18-2717 is categorized as a Mercury outboard gasket, made for the exhaust manifold sealing point on Mercury outboard engines.

How do I identify if I need the 18-2717 gasket? If you are servicing the exhaust manifold on a Mercury outboard and need a replacement seal for that mating surface, the Sierra 18-2717 is the gasket designated for that job.