Carburetor Gasket – Fits Mercury Marine Outboards (Replaces 27-31402)
Carburetor Gasket – Fits Mercury Marine Outboards (Replaces 27-31402) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Carburetor Gasket – Fits Mercury Marine Outboards (Replaces 27-31402)
Product Details
This aftermarket Carburetor Gasket is a reliable replacement for use in various Mercury outboard engine carburetors. It is designed to ensure a proper seal and restore engine performance for the specified models.
It serves as a direct replacement for Mercury Marine OEM part number 27-31402.
- Installation Type: Direct Replacement
- Ensures a reliable seal to prevent fuel and air leaks.
- Weight: 6 pounds (2.72 kg)
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine | 27-31402 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury Marine engines, check your model and serial number range to ensure correct fitment. Serial number breaks are critical for identifying the correct part.
| Brand | Model | Rated HP | OEM Part No. | Notes |
|---|---|---|---|---|
| Mercury | 200 | 200 | 27-31402 | Used on serial numbers 2296267-2827676, 2827677-3226957, 3226958-3537530 |
| Mercury | 350 | 350 | 27-31402 | Used on serial numbers 1571114-1812753, 1812754-1960826, 1960827-2874703 |
| Mercury | 500 | 500 | 27-31402 | Used across multiple serial number ranges |
| Mercury | 650 (4 CYL.) | 650 | 27-31402 | Used across multiple serial number ranges |
| Mercury | 850 (6 CYL.) | 850 | 27-31402 | Used on serial numbers 1460999-1766823 |
| Mercury | 900 (6 CYL.) | 900 | 27-31402 | Used on serial numbers 1766824-1869775 |
| Mercury | 950 (6 CYL.) | 950 | 27-31402 | Used on serial numbers 1869776-2318585 |
| Mercury | 1000 | 1000 | 27-31402 | Used on serial numbers 1464949-1768403, 1768404-2318585 |
| Mercury | 1000SS | 1000 | 27-31402 | Used on serial numbers 2318586-2836018 |
| Mercury | 1100 | 1100 | 27-31402 | Used on serial numbers 1870204-2314955 |
Technical Specs
- Product Type
- Carburetor Gasket
- Installation
- Direct Replacement
- Brand
- Mercury Marine
- Part Number
- 27-31402
- Dimensions
- 5.13 in x 4.0 in x 1.13 in
- Weight
- 6 pounds (2.72 kg)
- UPC
- 745061135017
What’s in the Box
- 1 x Carburetor Gasket (27-31402)
Installation Notes
- Disconnect the battery and ensure the engine is cool. Relieve any pressure in the fuel system.
- Remove the engine cowling and air silencer to access the carburetor.
- Carefully disconnect fuel lines, linkage cables, and any electrical connectors attached to the carburetor. Note their positions for reassembly.
- Unbolt and remove the carburetor from the intake manifold.
- Remove the old gasket and thoroughly clean both mounting surfaces. Ensure no old gasket material or debris remains.
- Position the new gasket correctly on the intake manifold.
- Reinstall the carburetor, ensuring it is seated properly against the new gasket. Tighten the mounting bolts to the manufacturer's specified torque.
- Reconnect all fuel lines, linkages, and electrical connectors.
- Reinstall the air silencer and engine cowling.
- Reconnect the battery. Prime the fuel system and check for any leaks before starting the engine.
Troubleshooting & FAQ
How do I know if my carburetor gasket has failed?
Common signs of a bad carburetor gasket include a rough idle, engine stalling, poor acceleration, fuel leaks around the carburetor, or a hissing sound indicating a vacuum leak. A visual inspection may reveal cracks or deterioration of the gasket material.
Is this gasket compatible with ethanol-blended fuels?
This gasket is made from materials designed to be resistant to modern fuels, including those containing ethanol. However, prolonged exposure to high concentrations of ethanol can degrade any gasket material over time.
Can I reuse my old gasket?
No. Carburetor gaskets are single-use "crush" style gaskets. Once compressed, they will not provide a reliable seal if removed and reinstalled. Always use a new gasket when installing a carburetor.
What is the difference between this part and the OEM version?
This is an aftermarket part designed to meet or exceed OEM specifications for fit, form, and function. It provides comparable performance and sealing capabilities at a better value.
Do I need sealant for this gasket?
Generally, carburetor gaskets are designed to be installed dry without any additional sealants. Applying sealant can interfere with the seal or contaminate the fuel system. Always follow the engine manufacturer's service manual for specific instructions.
What if my serial number is not listed?
If your engine's model and serial number are not explicitly listed in the compatibility chart, do not assume fitment. Please contact us with your engine details before purchasing to verify compatibility.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.
Shipping speed & cost
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns
Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.
Safety & Important Info
- Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
- This is an aftermarket replacement, not an OEM component.
- Professional installation is recommended for safety and performance.
About Sea Sierra
- Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
- Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
- Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.
Payment & Security
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