Mercruiser Mercury End Cap Gasket – Fits Mercury Marine Stern Drives (Replaces 27-39917)
Mercruiser Mercury End Cap Gasket – Fits Mercury Marine Stern Drives (Replaces 27-39917) 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
Mercruiser Mercury End Cap Gasket – Fits Mercury Marine Stern Drive...
Product Details
This high-quality aftermarket Mercruiser Mercury End Cap Gasket is designed for various Mercury Marine stern drives. It is an essential component for creating a secure seal in applicable housing units.
This part serves as a direct replacement for Quicksilver part number 27-39917 and Mercury part number 27-39917.
- Engineered as a direct replacement for the original part.
- Designed to create a reliable, long-lasting seal.
- This is a New Old Stock (NOS) item, ensuring fit and function.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Quicksilver | 27-39917 |
| Mercury | 27-39917 |
Technical Specs
- Product Type
- End Cap Gasket
- Dimensions
- 12.0" L x 11.0" W x 0.5" H
- Other Technical Attributes
- OEM Quicksilver Part
What’s in the Box
- 1 x End Cap Gasket (27-39917)
Installation Notes
- Ensure the engine is off and cool, and disconnect the battery for safety.
- Locate the assembly where the end cap gasket is situated.
- Remove the cover or component to access the old gasket.
- Carefully remove the old gasket, ensuring the mating surfaces are completely clean of any old material or residue.
- Compare the new gasket with the old one to confirm an exact match.
- Position the new gasket correctly.
- Reassemble the components, tightening any fasteners to the manufacturer’s recommended torque specifications.
- After reassembly, reconnect the battery, start the engine, and check for any leaks.
Troubleshooting & FAQ
How do I know if this is the right gasket for my stern drive?
The most reliable way to confirm fitment is by matching the part number 27-39917 to the one listed in your engine's service manual or by comparing it directly to your old part.
What are the signs of a failing end cap gasket?
Common symptoms include fluid leaks (oil or water) around the sealed area, evidence of corrosion, or pressure loss, which may affect engine performance.
Does this gasket require a sealant upon installation?
Most gaskets of this type are designed to be installed dry. However, it is always best practice to consult your specific service manual for any recommendations regarding the use of sealants.
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
Payment methods
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