Sierra 18-2956 Water Jacket Head Gasket for Johnson/Evinrude Outboard Motors, Replaces 0339620

The Sierra 18-2956 is a water jacket head gasket engineered for Johnson and Evinrude outboard motor applications. It seals the cylinder head against the engine block, maintaining proper compression and directing coolant flow through the water jacket passages to keep the powerhead running at the correct operating temperature. Each package contains one gasket, sized and cut to seat correctly against the mating surfaces of the applicable Johnson/Evinrude powerhead.

This gasket is manufactured to meet or exceed the performance of the original equipment part it replaces, making it a reliable choice for a head gasket replacement during a powerhead rebuild or routine maintenance. It is finished in white and is a direct fit for the Johnson/Evinrude applications it is designed for.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2956
• Product Name: Water Jacket Head Gasket
• Application: Johnson/Evinrude outboard motors
• Color: White
• Unit Count: 1 gasket per package
• Weight: 0.12 pounds
• UPC: 030999314550

Fitment

Johnson and Evinrude outboard motor applications.

Replaces (OEM)

• 0339620

Frequently Asked Questions

What engines does the Sierra 18-2956 head gasket fit? The Sierra 18-2956 is designed for Johnson and Evinrude outboard motor applications, where it serves as the water jacket head gasket between the cylinder head and engine block.

What OEM part number does the 18-2956 replace? The Sierra 18-2956 water jacket head gasket replaces OEM number 0339620.

How many gaskets come in a package? Each package of the Sierra 18-2956 contains one water jacket head gasket.

What color is the 18-2956 gasket? It is white.

How much does the 18-2956 head gasket weigh? The Sierra 18-2956 weighs 0.12 pounds.

Is the Sierra 18-2956 a genuine OEM part or an aftermarket replacement? The 18-2956 is a Sierra-manufactured replacement gasket built to meet or exceed the performance of the original equipment water jacket head gasket it replaces, rather than a part sourced directly from Johnson or Evinrude.

What is this gasket used for during installation? The 18-2956 seals the mating surface between the cylinder head and engine block on applicable Johnson/Evinrude outboards, maintaining compression and proper coolant flow through the water jacket during a head gasket or powerhead rebuild.

Does the 18-2956 include installation hardware or bolts? No, the package includes only the water jacket head gasket itself; no bolts or additional hardware are included.

Can I use the 18-2956 on any Johnson or Evinrude outboard? The 18-2956 is designed specifically for Johnson and Evinrude outboard motor applications; confirm the OEM number 0339620 against your engine's original gasket before ordering.

What is the UPC for the Sierra 18-2956? The UPC for the Sierra 18-2956 head gasket is 030999314550.