Sierra 18-2857-9 Air Silencer Gasket, Replaces 319771 386573, Johnson/Evinrude Outboard, Pack of 2

The Sierra 18-2857-9 Air Silencer Gasket seals the air silencer housing on Johnson/Evinrude outboard engines, preventing unmetered air leaks that can upset the carburetor's air/fuel mixture and cause rough running or hard starting. Each package contains 2 gaskets, so buyers replacing both sides of a housing or keeping a spare on hand get exactly what they need in one purchase.

Sierra builds this gasket to precise O.E. Fitment using materials selected for durability under engine heat and vibration, so it seats correctly against the mating surfaces and holds a consistent seal over time. Because it is a direct-fit replacement for the OEM numbers it replaces, installation follows the same steps as removing and reinstalling the factory gasket, with no modification needed. It is backed by Sierra's manufacturer warranty.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2857-9
• Product Name: Air Silencer Gasket
• Package Quantity: Pack of 2
• Material: Other
• Shape: Round
• Weight: 0.03 pounds
• UPC: 808282163624
• Category: Evinrude Outboard Gasket Sets

Fitment

• Johnson/Evinrude outboard engines

Replaces (OEM)

• 319771
• 386573

Frequently Asked Questions

What does the Sierra 18-2857-9 Air Silencer Gasket fit? The 18-2857-9 is designed for Johnson/Evinrude outboard engines, sealing the air silencer housing to the carburetor or air box.

How many gaskets come in a package? Sierra part 18-2857-9 is sold as a pack of 2 gaskets, covering both sides of the air silencer housing in one purchase.

What OEM part numbers does this gasket replace? It replaces Johnson/Evinrude OEM numbers 319771 and 386573.

Is the 18-2857-9 gasket genuine OEM or aftermarket? It is a Sierra-manufactured aftermarket gasket engineered for precise O.E. Fitment, not a Johnson/Evinrude branded original part, but it is built to match the original sealing surfaces and dimensions.

What material is the air silencer gasket made from? The 18-2857-9 gasket is made from a gasket-grade material listed as 'Other,' selected by Sierra for reliable sealing under engine heat and vibration.

How much does the 18-2857-9 gasket weigh? Each package of the Sierra 18-2857-9 Air Silencer Gasket weighs 0.03 pounds.

Is installation of this gasket straightforward? Yes, the 18-2857-9 is a direct replacement for the factory air silencer gasket, so it installs in the same position without modification when removing and reassembling the air silencer housing.

Does this gasket come with a warranty? The Sierra 18-2857-9 Air Silencer Gasket is backed by Sierra's manufacturer warranty.

What shape is the air silencer gasket? The 18-2857-9 gasket is round in shape.

Will one package of 18-2857-9 be enough for a full air silencer rebuild? Each package contains 2 gaskets, which is typically enough for a complete air silencer housing seal, though buyers with multiple housings should order accordingly.