Sierra 18-0779 Water Jacket Gasket for Yamaha Outboards - Replaces 6G5-11193-A0-00

The Sierra 18-0779 Water Jacket Gasket is a replacement gasket engineered for Yamaha outboard engines, sealing the water jacket to maintain proper cooling system integrity. Manufactured to meet or exceed original equipment quality, this gasket is a direct interchange for Yamaha part number 6G5-11193-A0-00. Each engine application requires 2 of these gaskets to complete the water jacket seal properly, so buyers should order accordingly for a full repair. The gasket is finished in white and is sold as a single unit per package. Sierra manufactures its marine gaskets to original equipment tolerances, helping ensure a proper seal against coolant leaks and preventing overheating issues caused by a failed or degraded water jacket gasket. This part is intended for technicians and boat owners performing water jacket maintenance, cylinder head service, or general cooling system repair on compatible Yamaha outboard engines. Installing a quality replacement gasket like the 18-0779 helps restore proper sealing after disassembly for maintenance or repair work.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0779
• Product Type: Water Jacket Gasket
• Color: White
• Quantity Required Per Engine: 2
• Weight: 0.24 pounds
• OEM Cross Reference: 6G5-11193-A0-00

Fitment

• Yamaha outboard engines

Replaces (OEM)

• 6G5-11193-A0-00

Frequently Asked Questions

What engines does the Sierra 18-0779 water jacket gasket fit? The Sierra 18-0779 is designed for Yamaha outboard engines, sealing the water jacket area of the powerhead.

What OEM part number does 18-0779 replace? It is a direct interchange for Yamaha part number 6G5-11193-A0-00.

How many gaskets do I need for one engine? Each engine application requires 2 of the 18-0779 gaskets, so plan to order enough to cover that quantity.

Is the Sierra 18-0779 sold as a single gasket or a set? The 18-0779 is sold as a single water jacket gasket per package, not as part of a multi-piece kit.

What color is the 18-0779 gasket? This water jacket gasket is white in color.

How much does the 18-0779 gasket weigh? The Sierra 18-0779 weighs 0.24 pounds.

Is Sierra 18-0779 a genuine OEM part or aftermarket? The 18-0779 is a Sierra-manufactured replacement gasket built to meet or exceed the quality of the original Yamaha 6G5-11193-A0-00 equipment it replaces.

When would I need to replace the water jacket gasket on a Yamaha outboard? The 18-0779 water jacket gasket should be replaced any time the powerhead is disassembled for service or if the original gasket has failed and is causing a coolant leak or overheating.

Does the 18-0779 come with installation instructions? The Sierra 18-0779 is a gasket component intended for installation by someone familiar with Yamaha outboard powerhead service; it does not include a separate instruction sheet.

Can the 18-0779 be used on other engine brands besides Yamaha? The 18-0779 is designed specifically for Yamaha outboard engines using the 6G5-11193-A0-00 water jacket gasket.