Sierra Cover Gasket 18-0232 for Yamaha Outboard Engines, Replaces 27-81031M

The Sierra 18-0232 is a cover gasket built for Yamaha outboard engines. It seals the mating surface between the engine cover and the block, preventing oil, coolant, or air leaks at that joint and helping the covered components run reliably. As a direct-fit replacement, it is engineered to match the exact profile and thickness of the original equipment gasket it replaces, so it installs without modification and restores a proper seal after the old gasket has hardened, torn, or compressed with age.

This gasket is manufactured by Sierra, a long-established supplier of marine engine parts, and is cross-referenced to the OEM Yamaha part number it replaces. It ships as a single gasket and is lightweight at just 0.01 pounds, reflecting its thin, flat construction typical of cover gaskets. Because gaskets are wear items that lose their sealing ability once removed or over time, keeping a replacement like the 18-0232 on hand makes routine cover maintenance straightforward.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0232
• Product Type: Cover Gasket
• Fitment: Yamaha outboard engines
• Replaces (OEM): 27-81031M
• Weight: 0.01 pounds
• Number of Items: 1
• UPC: 030999973788
• GTIN: 00030999973788

Fitment

Designed for Yamaha outboard engines.

Replaces (OEM)

27-81031M

Frequently Asked Questions

What engines does the Sierra 18-0232 cover gasket fit? The Sierra 18-0232 cover gasket is designed for Yamaha outboard engines and installs in place of the original cover gasket without modification.

Does the 18-0232 replace OEM part 27-81031M? Yes, the Sierra 18-0232 is a direct replacement for OEM Yamaha part 27-81031M and is built to the same fit and seal profile.

How much does the 18-0232 cover gasket weigh? The Sierra 18-0232 cover gasket weighs 0.01 pounds, consistent with its thin, flat gasket construction.

Is the 18-0232 sold as a single gasket or in a multi-pack? The Sierra 18-0232 is sold as a single cover gasket, with one item per package.

What is the UPC for the Sierra 18-0232 cover gasket? The UPC for the Sierra 18-0232 cover gasket is 030999973788, with a corresponding GTIN of 00030999973788.

What does a cover gasket like the 18-0232 actually do? A cover gasket seals the joint between an engine cover and the block it mounts to, preventing leaks at that surface; the 18-0232 performs this function on applicable Yamaha outboard engines.

Is the Sierra 18-0232 an OEM part or an aftermarket replacement? The 18-0232 is a Sierra aftermarket gasket manufactured to replace OEM Yamaha part 27-81031M, not an OEM-branded part.

When should the 18-0232 cover gasket be replaced? A cover gasket such as the 18-0232 should be replaced any time the cover it seals is removed, or if it shows signs of hardening, tearing, or leaking.

Can the 18-0232 gasket be reused after removal? No, cover gaskets including the 18-0232 are designed for one-time use and should be replaced with a new gasket any time the cover is taken off.

What comes in the package with the Sierra 18-0232? The package contains one Sierra 18-0232 cover gasket and no additional hardware or components.