Sierra 18-2873-9 Water Jacket Gasket, Replaces 318335, V-4 Johnson/Evinrude Outboard, Pack of 2

The Sierra 18-2873-9 Water Jacket Gasket seals the water jacket on V-4 Johnson and Evinrude outboard engines, sitting between the powerhead and cylinder block to maintain the cooling water passage and prevent leaks at this joint. It is sold as a pack of 2, giving you a spare or enough material for both a repair and a future service without a second purchase. The gasket is black in color and is designed as a direct fit for the water jacket location on applicable V-4 Johnson and Evinrude outboards, replacing the original equipment gasket bearing part number 318335.

This is a maintenance-grade sealing component intended for use during powerhead service, cylinder block reassembly, or when addressing a water jacket leak. Because it is packaged in a set of 2, it also suits shops or owners servicing more than one engine, or who want a gasket on hand for the next teardown.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2873-9
• Product Type: Water Jacket Gasket
• Package Quantity: 2 gaskets per package
• Engine Type: V-4
• Color: Black
• Weight: 0.26 pounds
• UPC: 808282163785

Fitment

• V-4 Johnson and Evinrude outboard engines

Replaces (OEM)

• 318335

Frequently Asked Questions

What engines does the Sierra 18-2873-9 water jacket gasket fit? The 18-2873-9 is designed for V-4 Johnson and Evinrude outboard engines, sealing the water jacket between the powerhead and cylinder block.

What OEM part number does this gasket replace? It replaces original equipment part number 318335 on applicable V-4 Johnson and Evinrude outboards.

How many gaskets come in a package of 18-2873-9? Each package contains 2 water jacket gaskets, so you get a spare or enough for a repeat service.

What color is the Sierra 18-2873-9 gasket? It is black, matching the appearance of the original water jacket gasket it replaces.

How much does the 18-2873-9 water jacket gasket weigh? The Sierra 18-2873-9, packaged as a set of 2, weighs 0.26 pounds.

Is the Sierra 18-2873-9 a genuine OEM part or an aftermarket replacement? It is an aftermarket replacement gasket manufactured by Sierra to fit in place of the original 318335 water jacket gasket.

When would I need to replace the water jacket gasket on my outboard? This gasket is typically replaced during powerhead service or cylinder block reassembly, or if a water jacket leak develops on a V-4 Johnson or Evinrude outboard.

Does the 18-2873-9 come with any other gaskets or hardware? The package includes only the 2 water jacket gaskets identified by part number 18-2873-9; no additional hardware is included.

Can I use the 18-2873-9 gasket on both Johnson and Evinrude engines? Yes, the Sierra 18-2873-9 is made to fit V-4 Johnson and Evinrude outboard engines.

What is the UPC for the Sierra 18-2873-9 water jacket gasket? The UPC for this pack of 2 gaskets is 808282163785.