Gasket – Fits Mercury/Mariner 200–400 HP Verado 6-Cylinder Outboards
Gasket – Fits Mercury/Mariner 200–400 HP Verado 6-Cylinder Outboards 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 is a replacement Gasket – Fits Mercury/Mariner 200–400 HP Verado 6-Cylinder Outboards designed for 4-stroke models manufactured between 2005 and 2018. It is specifically used in the adapter plate-lower assembly and is a component in powerhead gasket sets, ensuring a precise seal to prevent fluid leaks.
This part offers a direct interchange for Mercury part numbers 889618001, 27-889618001, and Quicksilver 27-889618001.
- Installation Location: Adapter Plate-Lower
- Engine Compatibility: Verado 6-Cylinder (200–400 HP)
- Built to meet or exceed original factory part specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket brands.
| Brand | Part Number |
|---|---|
| Mercury | 889618001 |
| Mercury | 27-889618001 |
| Quicksilver | 27-889618001 |
Engine & Model Compatibility
Confirm your engine model and year in the table below.
This gasket is designed for the following Mercury and Mariner Verado 6-cylinder outboard engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 200 VERADO (6 CYL.) | 200 | 4-Stroke | 2005–2018 | 889618001 | Serial numbers: 0T980000-1B226999, 1B227000-1B381711, 1B381712-1B517433, 1B517434-2B144122, 0P409357-0P464487, 0P464488-0P520552, 0P520553-2B144122, 2B144123-2B578935 |
| Mercury | 200 PRO VERADO (6 CYL.) | 200 | 4-Stroke | 2013–2018 | 889618001 | Serial numbers: 2B034840-2B144122, 2B144123-2B577715 |
| Mercury | 225 VERADO (6 CYL.) | 225 | 4-Stroke | 2005–2018 | 889618001 | Same serial number ranges as 200 VERADO |
| Mercury | 250 VERADO (6 CYL.) | 250 | 4-Stroke | 2005–2018 | 889618001 | Same serial number ranges as 200 VERADO |
| Mercury | 250 PRO VERADO (6 CYL.) | 250 | 4-Stroke | 2011–2018 | 889618001 | Serial numbers: 1B830170-2B144122, 2B144123-2B577715 |
| Mercury | 275 VERADO (6 CYL.) | 275 | 4-Stroke | 2005–2018 | 889618001 | Same serial number ranges as 200 VERADO |
| Mercury | 300 VERADO (6 CYL.) | 300 | 4-Stroke | 2009–2018 | 889618001 | Serial numbers: 0P520553-2B144122, 1B517434-2B144122, 2B144123-2B578935 |
| Mercury | 300 PRO VERADO (6 CYL.) | 300 | 4-Stroke | 2011–2018 | 889618001 | Serial numbers: 1B830170-2B144122, 2B144123-2B577715 |
| Mercury | 350 VERADO (6 CYL.) | 350 | 4-Stroke | 2015–2018 | 889618001 | Serial numbers: 2B141617 & Up |
| Mercury | 350 PRO VERADO (6 CYL.) | 350 | 4-Stroke | 2015–2018 | 889618001 | Serial numbers: 2B141124 & Up |
| Mercury | 350 SCi VERADO | 350 | 4-Stroke | 2007–2013 | 889618001 | Serial numbers: 1B716557-2B143542 |
| Mercury | 400 VERADO (6 CYL.) | 400 | 4-Stroke | 2015–2018 | 889618001 | Serial numbers: 2B141124 & Up |
| Mercury | 400R RACING (6 CYL.) | 400 | 4-Stroke | 2015–2018 | 889618001 | Serial numbers: 2B141124-3B342962 |
| Mariner | 200-400 VERADO (6 CYL.) | 200-400 | 4-Stroke | 2005–2018 | 889618001 | Same applications as Mercury models |
Technical Specs
- Product Type
- Gasket
- Installation
- Adapter Plate-Lower
- Dimensions
- Length: 29.1 cm, Width: 28.2 cm, Height: 0.3 cm
- Weight
- 0.02 lb (0.009 kg)
What’s in the Box
- 1 x GASKET (889618001)
Installation Notes
- Ensure the engine is off, cool, and disconnected from the battery.
- Drain necessary fluids like engine oil or coolant to prevent spills during disassembly.
- Remove any components obstructing access to the adapter plate.
- Carefully unbolt and detach the component that the gasket seals.
- Thoroughly clean both mating surfaces, removing all old gasket material and debris. Use a plastic scraper to avoid damaging the metal surfaces.
- Position the new gasket, ensuring all bolt holes are perfectly aligned.
- Reinstall the plate or component, tightening bolts to the manufacturer-specified torque and sequence.
- Reassemble any other parts that were removed.
- Refill the engine with the correct fluids to the proper levels.
- Reconnect the battery, start the engine, and meticulously check for any leaks around the newly sealed area.
Troubleshooting & FAQ
How do I confirm this gasket fits my Verado engine?
Check the compatibility table. This gasket fits specific Mercury/Mariner 200–400 HP Verado 6-cylinder outboards from 2005–2018. Verify your engine model, HP, and serial number range against the list to ensure a correct match.
What are the signs of a failing adapter plate gasket?
Common symptoms include external water or oil leaks around the adapter plate area, engine overheating, or water contamination in the engine oil (which often gives it a milky appearance). Any of these signs warrant an inspection.
When should this gasket be replaced?
This gasket should be replaced whenever the component it seals (like the adapter plate) is removed for service or if any signs of leakage are detected. It is not considered a routine scheduled maintenance item but is critical for preventing leaks when components are serviced.
Is this an OEM part or an aftermarket replacement?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. All parts are manufactured in an ISO 9002 facility and are batch-inspected for quality and consistency.
What are the shipping speed and cost?
We ship worldwide quickly—typical transit time is 5–15 days. Standard shipping is free for most orders, and expedited options will appear at checkout if they are available for your location.
What is the warranty and return policy?
This part is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter any issues, please contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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 quality control.
Payment & Security
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