Sierra 18-2876-9 Bypass Cover Gasket, Replaces 307133, Johnson/Evinrude Outboard - Pack of 2

The Sierra 18-2876-9 is a bypass cover gasket built for Johnson and Evinrude outboard applications. It seals the bypass cover against the engine block or exhaust housing, preventing coolant or exhaust leakage at this joint during operation. Each Sierra 18-2876-9 is sold as a pack of 2 gaskets, so you have a spare on hand or enough to service two mating surfaces in the same job.

Sierra manufactures this gasket to meet or exceed the specification of the original equipment part it replaces, giving you a reliable, properly-fitting seal without sourcing a discontinued OEM number. It is designed as a direct fit for the Johnson and Evinrude outboard bypass cover location that uses OEM part 307133, making it a straightforward drop-in replacement during a bypass cover service, water pump job, or general gasket set refresh.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2876-9
• Product Name: Bypass Cover Gasket
• Package Quantity: 2 gaskets per pack
• Application: Johnson and Evinrude outboard
• Weight: 0.04 pounds
• UPC: 808282163815
• GTIN: 00808282163815

Fitment

• Johnson and Evinrude outboard applications

Replaces (OEM)

• 307133

Frequently Asked Questions

What does the Sierra 18-2876-9 bypass cover gasket fit? The Sierra 18-2876-9 is designed for Johnson and Evinrude outboard applications, sealing the bypass cover on these engines.

How many gaskets come in a pack of the 18-2876-9? Each pack of the Sierra 18-2876-9 bypass cover gasket contains 2 gaskets.

Is the 18-2876-9 a direct replacement for OEM part 307133? Yes, the Sierra 18-2876-9 replaces OEM number 307133 on applicable Johnson and Evinrude outboards.

How much does the 18-2876-9 bypass cover gasket weigh? The Sierra 18-2876-9 bypass cover gasket weighs 0.04 pounds.

Does Sierra make this gasket to OEM quality standards? Sierra states that the 18-2876-9 bypass cover gasket meets or exceeds the original equipment part it replaces.

Is the Sierra 18-2876-9 genuine Sierra or aftermarket? The 18-2876-9 is manufactured by Sierra International as a replacement gasket, not a genuine Johnson/Evinrude OEM part, though it is designed to match OEM fit and function.

What is the UPC for the Sierra 18-2876-9 bypass cover gasket? The UPC for the Sierra 18-2876-9 bypass cover gasket is 808282163815.

When would I need to replace the bypass cover gasket on my outboard? A bypass cover gasket like the Sierra 18-2876-9 should be replaced whenever the bypass cover is removed for service, such as during a water pump or cooling system job, to ensure a proper seal.

Can I buy just one 18-2876-9 gasket instead of a pack of 2? The Sierra 18-2876-9 is sold as a pack of 2 gaskets and is not offered as a single unit.

What category of part is the Sierra 18-2876-9? The Sierra 18-2876-9 is a bypass cover gasket, part of Sierra's Evinrude outboard gasket offerings.