Sierra 18-2901-9 Exhaust Housing Gasket, Replaces 313065 306205, for Johnson/Evinrude 5, 5.5, 6 HP Outboards, Pack of 2

The Sierra 18-2901-9 Exhaust Housing Gasket is a replacement gasket engineered to seal the exhaust housing on Johnson and Evinrude (OMC/BRP) outboard motors in the 5, 5.5, and 6 HP range. It is sold as a pack of 2, giving you a spare on hand or enough to service two engines in one order. The gasket is designed to restore a tight, leak-free seal at the exhaust housing joint, preventing exhaust gas and water leakage that can occur once the original gasket hardens or compresses with age and heat cycling. As a direct-fit replacement, it is built to the original dimensions and mounting pattern so it installs in the same location as the factory gasket without modification. Sierra manufactures this gasket to meet or exceed the specifications of the original equipment part it replaces, making it a straightforward choice when servicing the exhaust housing during a tune-up, gasket set replacement, or troubleshooting an exhaust leak. It cross-references directly to Johnson/Evinrude OEM part numbers 313065 and 306205, so it is easy to confirm as the correct part before ordering. This gasket is intended specifically for the 5, 5.5, and 6 HP Johnson/Evinrude outboard family and is not a universal fit for other horsepower ranges.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2901-9
• Product Type: Exhaust Housing Gasket
• Package Quantity: Pack of 2
• Fitment: Johnson/Evinrude (OMC/BRP) Outboard, 5, 5.5, 6 HP
• Replaces (OEM): 313065, 306205
• Weight: 0.09 pounds
• UPC: 808282164041

Fitment

• Johnson/Evinrude (OMC/BRP) Outboard, 5, 5.5, 6 HP

Replaces (OEM)

• 313065
• 306205

Frequently Asked Questions

What engines does the Sierra 18-2901-9 exhaust housing gasket fit? The Sierra 18-2901-9 is designed for Johnson and Evinrude (OMC/BRP) outboard motors rated 5, 5.5, and 6 HP.

How many gaskets come in one order of 18-2901-9? Each order of the Sierra 18-2901-9 exhaust housing gasket includes a pack of 2 gaskets.

What OEM part numbers does this gasket replace? Sierra 18-2901-9 replaces Johnson/Evinrude OEM part numbers 313065 and 306205.

Is the Sierra 18-2901-9 gasket genuine OEM or aftermarket? It is a Sierra aftermarket replacement gasket, manufactured to meet or exceed the specifications of the original Johnson/Evinrude equipment part it replaces (313065, 306205).

How much does the 18-2901-9 exhaust housing gasket weigh? The Sierra 18-2901-9 exhaust housing gasket weighs 0.09 pounds.

Where is the exhaust housing gasket located on the outboard? The 18-2901-9 seals the exhaust housing joint on 5, 5.5, and 6 HP Johnson/Evinrude outboards to prevent exhaust and water leakage at that connection.

Can I use 18-2901-9 on a larger horsepower Johnson/Evinrude outboard? No, the Sierra 18-2901-9 exhaust housing gasket is specified for the 5, 5.5, and 6 HP Johnson/Evinrude engine family and is not listed as a fit for other horsepower ranges.

Do I need any special tools to install this gasket? Installation involves removing the exhaust housing to access the old gasket and fitting the new Sierra 18-2901-9 gasket in its place; no specialty tools beyond standard outboard service tools are indicated for this part.

What is the UPC for the Sierra 18-2901-9 gasket? The UPC for the Sierra 18-2901-9 exhaust housing gasket, pack of 2, is 808282164041.

Why would I need to replace the exhaust housing gasket? Exhaust housing gaskets like the Sierra 18-2901-9 can harden or compress over time, leading to exhaust or water leaks at the housing joint, which is when replacement with a fresh gasket set is needed.