Carburetor Gasket – Fits Mercury/Mariner 50-60 HP 3-Cylinder (Replaces 27-733771)
Carburetor Gasket – Fits Mercury/Mariner 50-60 HP 3-Cylinder (Replaces 27-733771) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
Worry-free returns
You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).
You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).
If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.
Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Product Details
This Carburetor Gasket is a high-quality replacement part designed for Mercury/Mariner 50–60 HP 3-cylinder engines manufactured between 1984 and 1990. It ensures a proper seal between the carburetor and the intake manifold for optimal engine performance.
It serves as a direct replacement for Mercury part numbers 27-73377 and 27-733771, and provides an interchange for Sierra 18-2804-9, WSM 516-16, and GLM 31810.
- Installs as a direct replacement for the original OEM part.
- Crafted from industry-standard gasket material for a durable, reliable seal.
- Made in Italy (WSM brand), ensuring quality manufacturing.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 27-73377 |
| Mercury | 27-733771 |
| Sierra | 18-2804-9 |
| WSM | 516-16 |
| GLM | 31810 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury/Mariner engines, it is recommended to check your engine's serial number against the ranges provided to ensure an exact match.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 3-Cylinder Cross Flow | 50 | 2-Stroke | 1986–1990 | 27-733771 | 2.875" Bore |
| Mercury | 3-Cylinder Cross Flow | 60 | 2-Stroke | 1984–1990 | 27-733771 | 2.875" Bore |
| Mercury | 3-Cylinder | 50 | 2-Stroke | 1984–1990 | 27-733771 | Serial #9469200-9683054 |
| Mercury | 3-Cylinder | 50 | 2-Stroke | 1984–1990 | 27-733771 | Serial #0B122930-0D000749 |
| Mercury | 3-Cylinder | 60 | 2-Stroke | 1984–1990 | 27-733771 | Serial #9469200-9683054 |
| Mercury | 3-Cylinder | 60 | 2-Stroke | 1984–1990 | 27-733771 | Serial #0B122930-0D000749 |
| Mercury | 3-Cylinder | 60 | 2-Stroke | 1984–1990 | 27-733771 | Serial #0A721308 & Up |
Technical Specs
- Product Type
- Carburetor Gasket
- Installation
- Direct replacement
- Fuel Type
- Gasoline
- Housing Material
- Industry-standard gasket material
- Dimensions
- 7.5 × 6.0 × 1.13 inches (190.5 × 152.4 × 28.7 mm)
- Weight
- 0.02 lbs (0.009 kg)
- Other Technical Attributes
- Made in Italy (WSM brand)
What’s in the Box
- 1 x Carburetor Gasket (Replaces 27-733771)
Installation Notes
- Disconnect the negative battery cable for safety.
- Shut off the fuel supply and place a rag under the carburetor to catch any spillage.
- Carefully disconnect the fuel line, throttle linkage, and any other connections to the carburetor.
- Remove the mounting nuts or bolts securing the carburetor to the intake manifold and carefully lift the carburetor off.
- Remove the old carburetor gasket and thoroughly clean both mating surfaces to remove any old material or residue.
- Place the new gasket onto the intake manifold, ensuring it is properly aligned with the mounting studs.
- Reinstall the carburetor, tightening the mounting hardware to the manufacturer's recommended torque specification.
- Reconnect the fuel line, throttle linkage, and any other previously disconnected components.
- Turn the fuel supply back on and reconnect the battery cable.
- Start the engine and carefully inspect for any fuel leaks around the gasket area before operation.
Troubleshooting & FAQ
How do I confirm this gasket will fit my engine?
This gasket fits specific Mercury/Mariner 50-60 HP 3-Cylinder engines from 1984–1990. Always cross-reference your engine's model and serial number with our compatibility chart and verify the OEM part number (27-733771) in your service manual.
What are the signs of a a bad carburetor gasket?
Common symptoms include fuel leaking from the carburetor base, a rough or unstable idle, engine stalling, or difficulty starting. A visual inspection may reveal cracks, brittleness, or deterioration of the old gasket.
Do I need to use a sealant with this gasket?
Typically, this gasket is designed to be installed dry without any additional sealant. Using sealant can sometimes interfere with a proper seal or cause obstruction if excess material squeezes into the intake path. Always consult your engine's service manual for manufacturer-specific recommendations.
Is this a single gasket or part of a larger kit?
This listing is for a single carburetor gasket, as specified in the "What’s in the Box" section of this page.
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.
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