Sierra 18-0933 Air Silencer Gasket, Replaces 314115, for Johnson/Evinrude Outboard Motors

The Sierra 18-0933 Air Silencer Gasket is a round replacement gasket engineered to seal the air silencer to the carburetor intake on Johnson/Evinrude outboard motors. It is built to meet or exceed original equipment quality, giving it the fit and sealing performance of the factory gasket it replaces. This gasket restores a proper air-tight seal at the air silencer mounting point, which is essential for correct carburetor airflow and preventing intake leaks that can cause rough running or hard starting.

As a low-cost, frequently replaced maintenance part, the 18-0933 is typically installed whenever the air silencer is removed for carburetor service, cleaning, or general outboard maintenance. Its round shape and OEM-equivalent construction make it a direct swap for the original Johnson/Evinrude gasket, and it is sold individually for a single air silencer location.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0933
• Category: Evinrude Outboard Gasket Sets
• Shape: Round
• Weight: 0.1 pounds
• UPC: 030999755414
• Compatible With: Johnson/Evinrude Outboard Motor
• OEM Cross-Reference: 314115

Fitment

• Johnson/Evinrude Outboard Motor (air silencer to carburetor location)

Replaces (OEM)

• 314115

Frequently Asked Questions

What does the Sierra 18-0933 gasket fit? The Sierra 18-0933 Air Silencer Gasket is designed for Johnson/Evinrude outboard motors, sealing the air silencer to the carburetor intake.

What OEM part number does the 18-0933 replace? It replaces OEM number 314115, so any listing that references 314115 for a Johnson/Evinrude air silencer gasket corresponds to the Sierra 18-0933.

Is the Sierra 18-0933 an OEM-equivalent gasket? Yes, the 18-0933 is built to meet or exceed original equipment quality, making it a direct equivalent to the factory Johnson/Evinrude air silencer gasket.

What shape is the 18-0933 gasket? The 18-0933 Air Silencer Gasket is round in shape, matching the mounting flange of the air silencer it seals.

How much does the 18-0933 gasket weigh? The Sierra 18-0933 weighs 0.1 pounds, consistent with its use as a thin sealing gasket rather than a structural component.

When should I replace the air silencer gasket? Replace the 18-0933 any time the air silencer is removed for carburetor cleaning or service, since gaskets should not be reused once broken loose from their seal.

What is included when I order the 18-0933? Each order includes one Sierra 18-0933 Air Silencer Gasket for a single air silencer location on a Johnson/Evinrude outboard motor.

Does the UPC 030999755414 match the Sierra 18-0933? Yes, UPC 030999755414 is the identifier for the Sierra 18-0933 Air Silencer Gasket.

Can I install the 18-0933 myself? Yes, the 18-0933 is a straightforward drop-in gasket that installs at the air silencer to carburetor joint during routine outboard maintenance.

Is the Sierra 18-0933 a genuine Sierra part or aftermarket? The 18-0933 is a genuine Sierra part manufactured to meet or exceed original equipment specifications for Johnson/Evinrude outboard motors.