Exhaust Manifold Gasket – Fits Mercury Marine/Quicksilver Outboards (Replaces 27-8M6000365)
Exhaust Manifold Gasket – Fits Mercury Marine/Quicksilver Outboards (Replaces 27-8M6000365) 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
Exhaust Manifold Gasket – Fits Mercury Marine/Quicksilver Outboards...
Product Details
This is a high-quality replacement Exhaust Manifold Gasket designed for various Mercury and Mariner outboard models. It is engineered to create a secure seal between the exhaust manifold and the engine block, preventing exhaust leaks.
This part is a direct interchange for Mercury Marine/Quicksilver part number 27-8M6000365.
- Engineered for direct replacement and easy installation.
- Compatible with all standard marine fuels.
- Built to withstand the high temperatures and pressures of marine environments.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury Marine/Quicksilver | 27-8M6000365 |
Engine & Model Compatibility
Specific engine model compatibility information is limited. To ensure a correct fit, please verify your engine's required part number against the references provided in our Part Number Matrix.
Technical Specs
- Product Type
- Exhaust Manifold Gasket
- Installation
- Direct replacement
- Fuel Type
- Compatible with all standard marine fuels
- Dimensions
- 50.0 cm x 12.1 cm x 0.2 cm
- Weight
- Approx. 0.10 lbs (0.045 kg)
- Warranty
- 1 year factory warranty against defects (Mercury Marine/Quicksilver)
What’s in the Box
- 1 x Exhaust Manifold Gasket (27-8M6000365)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery for safety.
- If required by your engine model, drain the engine coolant.
- Carefully unbolt and remove the exhaust manifold.
- Remove the old gasket completely. Thoroughly clean both the manifold and engine block surfaces, ensuring they are free of old gasket material, carbon, and debris.
- Position the new gasket correctly according to your service manual's instructions.
- Reinstall the exhaust manifold, tightening the bolts in the specified sequence and to the recommended torque values.
- Refill coolant if it was drained and reconnect the battery.
- Start the engine and carefully check for any exhaust or coolant leaks around the manifold.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
The best way to ensure compatibility is to verify that your existing part's number is 27-8M6000365. Since full engine model lists are not available, matching the part number is the most reliable method.
What are the signs of a failing exhaust manifold gasket?
Common symptoms include a loud exhaust noise from the engine bay, visible soot or black streaks around the manifold, reduced engine performance, or an exhaust smell inside the boat.
Can I reuse the old gasket or do I need a sealant?
No, gaskets are single-use components and should never be reused as they crush to create a seal. This gasket is designed to be installed dry; do not use any additional sealants unless explicitly specified by your engine's service manual.
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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