Mercury MerCruiser Quicksilver Carburetor Base Gasket 64692 | 27-64692
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Mercury / Quicksilver OEM Carburetor Base Gasket — Part No. 64692 / 27-64692
| Part Number | 64692 / 27-64692 |
|---|---|
| Brand | Mercury Marine / Quicksilver |
| Product Type | Carburetor Base Mounting Gasket |
| Sold As | Individually (one gasket per carburetor) |
| System | Fuel System / Carburetor |
| Diagram Position | Between carburetor base and intake manifold cover (120-series) or exhaust manifold (140-series) |
| Supersedes | 32910 (earlier reference on selected applications) |
| Aftermarket Cross-Reference | Sierra 18-0356 |
About This Part
The 64692 / 27-64692 is a genuine Mercury Marine / Quicksilver OEM carburetor base mounting gasket used on older MerCruiser carbureted gasoline engines. It seals the carburetor to the manifold or manifold cover, preventing vacuum leaks at the carburetor base. A compromised gasket at this location allows unmetered air into the intake, which can cause lean running conditions, unstable idle, and tuning problems. This gasket should be replaced any time the carburetor is removed.
Compatible Applications
Confirm the engine model, serial number, carburetor type, and exact manifold configuration before ordering. The most reliable fitment method is to verify 27-64692 directly in your engine’s carburetor or fuel-system schematic. Documented applications include selected:
- GM 120 / 2.5L / 153 CID inline-4 — carburetor-to-intake-manifold-cover gasket
- GM 140 / 3.0L / 181 CID inline-4 — carburetor-to-exhaust-manifold gasket
- Other older MerCruiser carbureted gasoline engines where the factory carburetor diagram specifically calls for 64692
Note: Mercury parts catalogs describe this gasket slightly differently across engine families (manifold cover vs. exhaust manifold). The OEM part number 64692 is the most reliable identifier — match it directly to your engine’s diagram rather than relying on the description alone.
When to Replace
- Any time the carburetor is removed — always install a new gasket on reassembly
- Old gasket is crushed, torn, hardened, or fuel-soaked
- Suspected vacuum leak at the carburetor base
- Unstable idle or lean running that points to unmetered air ingestion
- Carburetor mounting surface disturbed during service work
Installation Notes
- Remove all old gasket material from both mating surfaces before installation
- Clean and inspect the carburetor base and manifold flange for warping, corrosion, or pitting
- Confirm the gasket opening and mounting holes align correctly before seating
- Do not reuse the old gasket — always fit a new one when the carburetor is reinstalled
- Mercury diagrams typically show the carburetor retained by four mounting studs and nuts directly above this gasket
- Tighten mounting hardware evenly per the applicable MerCruiser service manual torque specification
Cross-Reference / Alternate Part Numbers
- 64692 — primary SKU (this item)
- 27-64692 — Mercury-prefixed number
- 32910 — earlier / superseded reference on selected applications
- Sierra 18-0356 — aftermarket replacement cross-reference
Related Products
- Mercury MerCruiser 2-Barrel Carburetor Repair Kit 823427A1 — complete carburetor rebuild kit for applicable MerCruiser 2-barrel carbureted engines
Parts Desk Insights
This is a straightforward annual-service or carburetor-rebuild item, but it’s easy to overlook when ordering a carburetor repair kit — not all kits include the base mounting gasket. If you’re pulling the carb for a rebuild or cleaning, order this gasket separately to ensure you have it on hand. The most common issue we see is customers identifying this part by description rather than part number: Mercury describes it differently in different engine diagrams (manifold cover vs. exhaust manifold), so go straight to the diagram for your engine’s serial number and confirm 64692 is the number shown before ordering.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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Item must be in new, unused condition
Product must be in its original packaging
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Packaging must be undamaged and suitable for resale
Important:
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