Sierra Water Jacket Cover Gasket 18-0767 for Yamaha Outboard Engines

The Sierra Water Jacket Cover Gasket, part number 18-0767, is a replacement gasket engineered to seal the water jacket cover on applicable Yamaha outboard engines. Positioned in the cooling passage assembly, this gasket creates a reliable seal between the water jacket cover and the engine block, helping prevent coolant leaks and maintain proper cooling system pressure. Installing a correctly sized, properly fitted gasket at this joint is essential to keeping raw water or coolant contained within the intended passages during engine operation.

This gasket is manufactured to precise dimensions for a consistent, drop-in fit at the water jacket cover interface. Sierra Marine produces this part under its own part numbering system for the marine aftermarket, giving boat owners and marine technicians a dedicated replacement option when servicing the cooling system on a Yamaha outboard. Because gaskets are wear items that harden, compress, or degrade with heat cycling and time, replacing the water jacket cover gasket whenever the cover is removed for inspection or service helps ensure a leak-free reseal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0767
• Product Category: Yamaha Outboard Gasket
• UPC: 030999874641
• Weight: 0.22 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches

Fitment

• Designed for applicable Yamaha outboard engines (water jacket cover application)

Replaces (OEM)

• No verified OEM cross-reference number is available for this part

Frequently Asked Questions

What is the Sierra 18-0767 gasket used for? It seals the water jacket cover on applicable Yamaha outboard engines, sitting between the cover and the engine block to help contain coolant within the cooling passages.

Is the 18-0767 gasket a genuine Sierra part? Yes, 18-0767 is Sierra's own part number for this Water Jacket Cover Gasket, manufactured for the marine aftermarket rather than sold under a third-party label.

What size is the Sierra Water Jacket Cover Gasket? The gasket measures 0.39 x 0.39 x 0.39 inches and weighs 0.22 pounds.

Which engines does part number 18-0767 fit? This gasket is designed for the water jacket cover application on applicable Yamaha outboard engines.

Does Sierra list an OEM cross-reference number for 18-0767? No verified OEM cross-reference number is documented for the Sierra 18-0767 Water Jacket Cover Gasket.

How do I know if I need to replace this gasket? Coolant or water seepage around the water jacket cover, visible gasket hardening, or a compressed/damaged gasket surface after removing the cover are signs the 18-0767 gasket should be replaced.

Can I reuse the old gasket when reinstalling the water jacket cover? It is best practice to install a new gasket, such as the Sierra 18-0767, any time the water jacket cover is removed, since gaskets are designed as one-time-use sealing components.

What comes in the package with part 18-0767? The listing includes one Sierra Water Jacket Cover Gasket, part number 18-0767.

Is this gasket sold individually or as part of a kit? Part number 18-0767 is sold as a single, individual Water Jacket Cover Gasket.

How is the Sierra 18-0767 different from a generic aftermarket gasket? It carries Sierra's own manufacturer part number and is produced to defined dimensions specifically for the water jacket cover application on applicable Yamaha outboards, rather than being a generic, unspecified-fit gasket.