Sierra Carburetor Gasket 18-0384, Replaces 27-89221-1, Mercury Outboard

The Sierra Carburetor Gasket 18-0384 is a replacement carburetor gasket sold for Mercury outboard carburetor service and rebuild work. It is used during carburetor overhaul or reassembly to restore a proper seal at the carburetor mounting or body joint, helping prevent air and fuel leaks that can cause rough idle, hard starting, or an inconsistent air/fuel mixture. This gasket is a genuine Sierra part identified by Sierra part number 18-0384 and is cross-referenced to OEM number 27-89221-1, so it can be ordered as a direct equivalent when that OEM number is called out in a service manual or parts diagram. It is a compact, precision-cut gasket with a small footprint suited to carburetor-body sealing rather than larger engine gaskets, and it ships as an individual gasket rather than a full kit. Because carburetor gaskets are compressed and can take a permanent set once installed, Sierra recommends replacing this gasket any time the carburetor is disassembled rather than reusing the old one. It is intended for Mercury outboard carburetor applications.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0384
• Product Type: Carburetor Gasket
• Application: Mercury outboard carburetor
• Replaces (OEM): 27-89221-1
• Weight: 0.01 pounds
• Product Dimensions: 0.39 x 0.39 x 0.39 inches
• UPC: 030999949622

Fitment

Fits Mercury outboard carburetors that use OEM gasket 27-89221-1.

Replaces (OEM)

• 27-89221-1

Frequently Asked Questions

What is the Sierra 18-0384 gasket used for? Sierra 18-0384 is a carburetor gasket used to seal a joint on Mercury outboard carburetors during rebuild or reassembly, helping prevent air and fuel leaks.

Does 18-0384 replace OEM part 27-89221-1? Yes, Sierra part 18-0384 is the equivalent for OEM number 27-89221-1 and can be ordered in place of that number.

What are the dimensions of the 18-0384 carburetor gasket? The gasket measures 0.39 x 0.39 x 0.39 inches, a small, compact size suited to a carburetor body joint rather than a full engine gasket.

How much does the Sierra 18-0384 gasket weigh? It weighs 0.01 pounds, consistent with a small individual carburetor gasket.

Is this a genuine Sierra part or an aftermarket copy? 18-0384 is a genuine Sierra-branded carburetor gasket, not a generic aftermarket copy, though it is built to be a direct equivalent to OEM gasket 27-89221-1.

Can I reuse my old carburetor gasket instead of buying 18-0384? It is not recommended; carburetor gaskets like the Sierra 18-0384 take a compression set once installed, so a fresh gasket is needed any time the carburetor is opened up to maintain a proper seal.

What comes in the package for part number 18-0384? The listing for Sierra 18-0384 includes the carburetor gasket itself; it is sold as an individual gasket, not a multi-piece kit.

What engines or applications is the 18-0384 gasket used on? Sierra 18-0384 is intended for Mercury outboard carburetor applications that use OEM gasket 27-89221-1.

Is Sierra 18-0384 a full carburetor kit or a single gasket? It is a single carburetor gasket, part number 18-0384, not a complete carburetor rebuild kit.

How do I know if 18-0384 is the correct gasket for my carburetor? Check your carburetor's parts diagram or old gasket for OEM number 27-89221-1; if that number is listed, Sierra 18-0384 is the correct replacement.