GASKET – Fits Mercury/MerCruiser (Replaces 27-995061)
GASKET – Fits Mercury/MerCruiser (Replaces 27-995061) is backordered and will ship as soon as it is back in stock.
Couldn't load pickup availability
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
GASKET – Fits Mercury/MerCruiser (Replaces 27-995061)
Product Details
This aftermarket GASKET – Fits Mercury/MerCruiser (Replaces 27-995061) is designed for a precise fit on a wide range of MerCruiser sterndrives and transom assemblies. It is compatible with R/MR/Alpha One models (1983–1990), Alpha One Gen II (1991 and up), and Bravo I/II/III sterndrives, covering various serial number ranges for reliable sealing.
It serves as a direct cross-reference for Sierra part 18-0667 and GLM part 32160, and supersedes the original Mercury part 99506.
- Installs on the connector cover and anodic plate.
- Engineered to meet or exceed OEM specifications for material and fit.
- Ensures a proper seal to prevent water intrusion and corrosion.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury / MerCruiser / Quicksilver | 27-995061 | Supersedes part number 99506. |
| Sierra | 18-0667 | Aftermarket replacement. |
| GLM | 32160 | Aftermarket replacement. |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is verified to fit the following MerCruiser models based on the specified serial number ranges.
| Brand | Model | Years | OEM Part No. | Notes |
|---|---|---|---|---|
| MerCruiser | R/MR/Alpha One (Sterndrive) | 1983–1990 | 27-995061 | Serial: 6225577 THRU 0F386995 |
| MerCruiser | R/MR/Alpha One (Transom Assembly) | 1983–1990 | 27-995061 | Serial: 6216687 THRU 0F386995 |
| MerCruiser | Alpha One (GEN. II) | 1991–1995 | 27-995061 | Serial: 0D469859 THRU 0F679999 |
| MerCruiser | Alpha One (GEN. II) | 1996–1997 | 27-995061 | Serial: 0F680000 THRU 0K999999 |
| MerCruiser | Alpha One (GEN. II) | 1998 and up | 27-995061 | Serial: 0L100040 & Up |
| MerCruiser | Bravo I/II/III (Sterndrive & Transom Assembly) | 27-995061 | Serial: 0B664190 THRU 0F729999 |
Technical Specs
- Product Type
- Gasket
- Installation
- Connector Cover, Anodic Plate
- Weight
- 0.007 kg (0.015 lbs)
- Dimensions
- 5.13" x 4.0" x 1.13"
- Warranty
- Limited Lifetime (Aftermarket Sierra)
What’s in the Box
- 1 x Gasket (Replaces 27-995061)
Installation Notes
- Disconnect the battery or main power source to prevent electrical hazards.
- Access the component requiring the new gasket (e.g., gimbal housing or transom assembly).
- Carefully remove the old, worn gasket. Ensure the mating surfaces are completely clean of any old gasket material, sealant, or corrosion.
- Align the new gasket correctly on the cleaned surface. Do not use sealant unless specified by the manufacturer for your application.
- Reassemble all components, tightening fasteners to the manufacturer's recommended torque specifications in the correct sequence.
- After reassembly, reconnect power and test the engine in a safe environment, checking thoroughly for any leaks.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific engine?
The most reliable method is to match your sterndrive or transom assembly's serial number to the ranges listed in the Engine & Model Compatibility table. Do not rely on model and year alone.
What are the signs of a failing connector cover gasket?
Common signs include water leakage around the gimbal housing or transom assembly, visible corrosion on or around the connector cover, and potential electrical issues if water has intruded into a connector.
Is this a single gasket or a pack of two?
This listing is for a single aftermarket gasket. While some OEM or other aftermarket kits may be sold in pairs (e.g., Sierra 18-0667 is often packaged as a 2-pack), this product is sold individually.
Should I use sealant when installing this gasket?
Generally, this type of gasket is designed to be installed dry. Using sealant can sometimes cause the gasket to slip or squeeze out of place. Always follow your engine's service manual recommendations.
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
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
