GASKET – Mercury Outboard 20-25 HP (Replaces Quicksilver 27-41670006, 416705)
GASKET – Mercury Outboard 20-25 HP (Replaces Quicksilver 27-41670006, 416705) 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).
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
GASKET – Mercury Outboard 20-25 HP (Replaces Quicksilver 27-4167000...
Product Details
This replacement GASKET – Mercury Outboard 20-25 HP is designed for Mercury 2-Cylinder 2-Stroke outboards in the 20 to 25 HP range. It provides a reliable seal between the cylinder block and the mounting plate for models with serial numbers 1B000001 & Up, 0P325500 & Up, and 0T980000 THRU 0T999999.
This part is a direct replacement for Quicksilver part number 27-41670006, which superseded part number 416705.
- Installs between the cylinder block and mounting plate.
- Engineered to meet or exceed original equipment specifications for sealing and durability.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Quicksilver | 27-41670006 | Current part number |
| Quicksilver | 416705 | Superseded by 27-41670006 |
Engine & Model Compatibility
Confirm your engine model and year range in the table below to ensure correct fitment.
This gasket is specifically for select 2-stroke Mercury outboard engines ranging from 20 to 25 HP.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 20 (2 CYL.) | 20 | 2-Stroke | 0P325500 & Up | 27-41670006 |
| Mercury | 20 JET | 20 | 2-Stroke | 0T980000–0T999999 | 27-41670006 |
| Mercury | 20 JET | 20 | 2-Stroke | 1B000001 & Up | 27-41670006 |
| Mercury | 25 (2 CYL.) | 25 | 2-Stroke | 0P325500 & Up | 27-41670006 |
| Mercury | 25 (2 CYL.) | 25 | 2-Stroke | 0T980000–0T999999 | 27-41670006 |
| Mercury | 25 (2 CYL.) | 25 | 2-Stroke | 1B000001 & Up | 27-41670006 |
Technical Specs
- Product Type
- Gasket
- Installation Location
- Cylinder Block to Mounting Plate
- Weight
- 0.029 kg (0.06 lbs)
- Dimensions
- 10.88 in x 8.0 in x 1.13 in
- Other Technical Attributes
- Refer to OEM service manual for specific installation instructions.
What’s in the Box
- 1x Gasket (Replaces 27-41670006)
Installation Notes
- Ensure the engine is off and cool before starting. Disconnect the battery for safety.
- Access the area where the cylinder block meets the mounting plate.
- Carefully remove the old, worn gasket. Thoroughly clean both mating surfaces to remove any old adhesive or gasket residue.
- Align the new gasket correctly. Do not use sealants unless specified by the manufacturer's service manual.
- Reassemble the components, tightening bolts to the torque values specified in your OEM service manual.
- After reassembly, reconnect the battery, start the engine, and check for any exhaust or water leaks around the new gasket.
Troubleshooting & FAQ
How do I confirm this gasket is correct for my Mercury outboard?
Verify your engine's model, horsepower, and serial number against the "Engine & Model Compatibility" table. This part fits specific 20-25 HP 2-cylinder, 2-stroke models within the listed serial number ranges.
What are the common signs of a failed mounting plate gasket?
Symptoms may include water leaks around the engine block, exhaust leaks, engine overheating, or a noticeable loss of power and compression. Visual inspection may reveal cracks or degradation of the old gasket material.
Is any sealant required when installing this gasket?
Generally, this type of gasket is installed dry. However, always consult your engine's official OEM service manual for the most accurate installation procedures, as some applications may have specific requirements.
How does this part compare to the original Quicksilver 27-41670006?
This is an aftermarket component manufactured to meet or exceed the performance specifications of the original OEM part. It is made with comparable materials to ensure a proper seal and long service life under marine conditions.
Can I reuse my old bolts for this installation?
It is best practice to inspect bolts for corrosion or thread damage. If any wear is detected, they should be replaced. Always follow the torque specifications in the service manual to ensure a proper and secure seal.
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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