Sierra Carburetor Mounting Gasket 18-0685, Replaces 27-64692 & 27-32910, For Rochester Carburetors

The Sierra 18-0685 is a carburetor mounting gasket designed for Rochester carburetors on marine inboard and sterndrive engines. It seals the joint between the carburetor base and the intake manifold, preventing vacuum leaks and unmetered air from entering the intake tract that can cause rough idle, hard starting, or an incorrect air-fuel mixture. Installing a properly sized, marine-grade gasket at this joint is a standard step whenever a carburetor is removed for service, rebuilt, or replaced.

This gasket is a direct-fit replacement for Rochester carburetor applications and cross-references to OEM part numbers 27-64692 and 27-32910, so it can be ordered using either the Sierra part number or the original OEM number. It is built to seal reliably against the heat, vibration, and fuel exposure found at the carburetor base on a running marine engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-0685
• Product Type: Carburetor Mounting Gasket
• Compatibility: For Rochester carburetors
• OEM Cross-Reference: 27-64692, 27-32910
• Weight: 0.3 pounds
• UPC: 808282120061

Fitment

• For Rochester carburetors

Replaces (OEM)

• 27-64692
• 27-32910

Frequently Asked Questions

What does the Sierra 18-0685 gasket fit? The Sierra 18-0685 is a carburetor mounting gasket made for Rochester carburetors, sealing the base of the carburetor to the intake manifold.

Is the 18-0685 gasket the same as OEM part 27-64692? Yes, Sierra 18-0685 directly cross-references to OEM numbers 27-64692 and 27-32910, so it can be used as a like-for-like replacement for either of those part numbers.

What OEM numbers does this gasket replace? This gasket replaces OEM numbers 27-64692 and 27-32910.

How much does the 18-0685 gasket weigh? The Sierra 18-0685 carburetor mounting gasket weighs 0.3 pounds.

Will this gasket work with any carburetor? No, the 18-0685 is designed specifically for Rochester carburetors and should be matched to that application.

Do I need a new gasket every time I remove the carburetor? Yes, a carburetor mounting gasket like the Sierra 18-0685 should be replaced whenever the carburetor is removed, since reusing a compressed gasket can lead to vacuum leaks.

What symptoms indicate a failed carburetor mounting gasket? A failing carburetor base gasket, such as the one replaced by Sierra 18-0685, can cause rough idle, hesitation, or an inconsistent air-fuel mixture from unmetered air entering at the carburetor base.

Is Sierra 18-0685 an OEM or aftermarket part? Sierra 18-0685 is a Sierra-branded replacement gasket engineered to match the fit and sealing performance of the OEM carburetor mounting gaskets it cross-references, 27-64692 and 27-32910.

What is included when I order part 18-0685? Ordering Sierra 18-0685 provides one carburetor mounting gasket sized for Rochester carburetor applications.

Can I order this gasket using the OEM part number instead of the Sierra number? Yes, since 18-0685 cross-references to OEM numbers 27-64692 and 27-32910, either number identifies the same gasket.