Sierra 18-0644 Reed Plate Gasket for Mercury Outboards, Replaces 27-146972

The Sierra 18-0644 Reed Plate Gasket is a replacement gasket engineered to seal the reed plate assembly on applicable Mercury outboard engines. It is built to meet or exceed the quality of the original equipment part it replaces, giving boaters a reliable seal that helps maintain proper crankcase compression and prevent air leaks at the reed block interface. The gasket is white in color and is sized to match the original reed plate mounting surface it is designed for.

Reed plate gaskets are a wear item that should be replaced any time the reed valve assembly is removed for inspection or service, since a used gasket can lose its ability to seal properly once disturbed. Installing a fresh Sierra 18-0644 gasket during reed plate maintenance helps restore a tight seal between mating surfaces and supports consistent engine performance. This part cross-references directly to GLM 37530 and Mercury 27-146972, making it straightforward to identify as a correct match when replacing a worn or damaged original gasket.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0644
• Product Type: Reed Plate Gasket
• Color: White
• UPC: 808282242824
• Weight: 0.2 pounds
• Package Dimensions: 0.508 centimeters H x 17.78 centimeters L x 35.56 centimeters W
• Country of Origin: China
• OEM Cross-Reference: GLM 37530, Mercury 27-146972

Fitment

Specific engine models and year ranges are not specified for this part; it is cross-referenced to GLM 37530 and Mercury 27-146972.

Replaces (OEM)

• GLM 37530
• Mercury 27-146972

Frequently Asked Questions

What is the Sierra 18-0644 Reed Plate Gasket used for? It seals the reed plate assembly on applicable Mercury outboard engines, helping maintain proper compression and preventing air leaks at the reed block.

Does the 18-0644 gasket cross-reference to any OEM numbers? Yes, the Sierra 18-0644 is interchangeable with GLM 37530 and Mercury 27-146972.

Is the Sierra 18-0644 equivalent to the Mercury 27-146972 gasket? Yes, Mercury 27-146972 is a direct cross-reference for the Sierra 18-0644 Reed Plate Gasket.

What color is the reed plate gasket? The Sierra 18-0644 Reed Plate Gasket is white.

How much does the 18-0644 gasket weigh? It weighs 0.2 pounds.

What are the package dimensions of the Sierra 18-0644 gasket? The package measures 0.508 centimeters H by 17.78 centimeters L by 35.56 centimeters W.

Where is the Sierra 18-0644 Reed Plate Gasket manufactured? The country of origin for the Sierra 18-0644 is China.

Is this a genuine Sierra part or aftermarket? The 18-0644 is a genuine Sierra branded part, manufactured to meet or exceed the quality of the original equipment gasket it replaces.

When should the reed plate gasket be replaced? Any time the reed valve assembly on the outboard is removed for inspection or service, since a used gasket can lose its ability to seal once disturbed; the Sierra 18-0644 is designed as a fresh replacement for that job.

What is included when ordering part 18-0644? The order includes one Sierra 18-0644 Reed Plate Gasket.

Is the GLM 37530 gasket the same as the Sierra 18-0644? Yes, GLM 37530 is listed as an interchangeable cross-reference for the Sierra 18-0644 Reed Plate Gasket.