Sierra 18-2894-9 Exhaust Housing Gasket, Replaces 304314, Johnson/Evinrude 35/40 HP, Pack of 2

The Sierra 18-2894-9 Exhaust Housing Gasket is a marine engine gasket built for Johnson and Evinrude outboard applications, sized for 35/40 HP powerheads. It seals the exhaust housing to prevent exhaust leakage and water intrusion at the joint, helping maintain proper exhaust flow and cooling performance. Each package contains two gaskets, giving you a spare on hand or enough to service two units in a single order. This gasket is interchangeable with Johnson/Evinrude Outboard part number 304314, so it installs as a direct equivalent during a housing rebuild or routine maintenance. Sierra manufactures each gasket to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for outboard owners and marine technicians performing exhaust housing service. Use it whenever the exhaust housing is disassembled for inspection, cleaning, or repair, since gaskets should always be replaced rather than reused once the housing has been separated.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2894-9
• Product Name: Exhaust Housing Gasket
• Package Quantity: 2 gaskets
• Weight: 0.1 pounds
• UPC: 808282163990

Fitment

• Johnson and Evinrude outboards, 35/40 HP

Replaces (OEM)

• 304314

Frequently Asked Questions

What does the Sierra 18-2894-9 gasket fit? The 18-2894-9 exhaust housing gasket fits Johnson and Evinrude outboards in the 35/40 HP range.

Is this the same as Johnson/Evinrude part 304314? Yes, the Sierra 18-2894-9 is interchangeable with Johnson/Evinrude Outboard part number 304314.

How many gaskets come in a package? Each 18-2894-9 package includes two exhaust housing gaskets.

How much does this gasket weigh? The 18-2894-9 exhaust housing gasket weighs 0.1 pounds per package.

Can I reuse the old exhaust housing gasket instead of buying a new one? No, once the exhaust housing has been separated the original gasket should be discarded and replaced with a new Sierra 18-2894-9 gasket to ensure a proper seal.

Is the Sierra 18-2894-9 genuine or aftermarket? The 18-2894-9 is a Sierra-manufactured aftermarket gasket engineered to meet or exceed the performance of the original Johnson/Evinrude equipment part it replaces.

What is included when I order this part? An order of the Sierra 18-2894-9 includes two exhaust housing gaskets, sold as a pair per package.

Will this gasket work on any outboard horsepower? No, the 18-2894-9 exhaust housing gasket is designed specifically for Johnson and Evinrude 35/40 HP outboard applications.

Why would I need to replace the exhaust housing gasket? The exhaust housing gasket seals the joint between the exhaust housing and powerhead; a worn or damaged gasket like the original 304314 equivalent can allow exhaust or water leakage, which is when the 18-2894-9 should be installed.

What brand makes part number 18-2894-9? Sierra manufactures the 18-2894-9 exhaust housing gasket for Johnson and Evinrude outboards.