Aftermarket Oil Pan Drain Plug Gasket, 2-Pack – Replaces Mercury Marine 27-49955 and 8M0077608
Aftermarket Oil Pan Drain Plug Gasket, 2-Pack – Replaces Mercury Marine 27-49955 and 8M0077608 is backordered and will ship as soon as it is back in stock.
Worry-free returns
Worry-free returns
Shop with confidence. If you’re not completely satisfied, eligible items may be returned within the return window, provided they are unused and in original packaging.
If the return is due to our error or a defective item, we’ll make it right.
Please contact us before returning any item.
Delivery and Shipping
Delivery and Shipping
Orders are typically processed within 1–2 business days.
U.S. orders usually arrive within 6–15 days, depending on stock location and destination.
International delivery times may vary due to customs processing.
Tracking information will be provided once your order ships.
Aftermarket Oil Pan Drain Plug Gasket, 2-Pack – Replaces Mercury Ma...
Aftermarket Oil Pan Drain Plug Gasket, 2-Pack – Replaces Mercury Marine 27-49955 and 8M0077608 is backordered and will ship as soon as it is back in stock.
Product Details
This aftermarket oil pan drain plug gasket is designed as a replacement sealing washer for applicable Mercury Marine and MerCruiser marine-engine drain plug applications. It helps create a fresh seal when servicing engine oil and is intended to help prevent seepage around the drain plug.
The cataloged replacement reference is Mercury Marine 27-49955, superseded or cross-referenced with 8M0077608. Sierra lists its corresponding replacement as 18-0905, supplied as a package of two.
- For applicable oil pan drain plug applications
- Helps seal the drain plug during routine oil service
- Aftermarket replacement for the listed Mercury Marine references
- Sold as a 2-piece package
Part Number Matrix
Use the references below to compare the gasket with the part removed from your engine. A number match should be confirmed against the engine service manual or parts catalog before installation.
| Brand or Source | Part Number | Role |
|---|---|---|
| Mercury Marine | 27-49955 | OEM reference |
| Mercury Marine | 8M0077608 | Superseding or replacement reference |
| Mercury Marine | 27-34502 | Additional replacement reference listed by Sierra |
| Mercury Marine | 27-60721 | Additional replacement reference listed by Sierra |
| Sierra | 18-0905 | Aftermarket replacement; package of 2 |
Compatibility Information
Catalog references identify this gasket for applicable Mercury Marine and MerCruiser oil pan drain plug applications. The available catalog evidence does not establish one universal fitment across every engine, horsepower rating, year, or serial-number range.
Before ordering, compare the removed gasket and verify the reference number in the correct parts diagram for your exact engine model, year, and serial number. Do not rely on horsepower alone to determine fitment.
| Application | Verified Reference | Fitment Note |
|---|---|---|
| Mercury Marine and MerCruiser oil pan drain plug applications | 27-49955 | Confirm the exact engine parts catalog before installation |
| Replacement or superseded reference | 8M0077608 | Use only where the engine catalog identifies this reference |
| Aftermarket cross-reference | Sierra 18-0905 | Cataloged as an oil pan drain plug gasket, package of 2 |
Technical Specs
- Product Type
- Oil pan drain plug gasket
- Application
- Applicable Mercury Marine and MerCruiser oil pan drain plugs
- Construction
- Replacement sealing washer; material and exact dimensions are not specified in the available catalog evidence
- Package Quantity
- 2 gaskets
- Product Status
- Aftermarket replacement, not a genuine Mercury Marine component
What’s in the Box
- 2 x aftermarket oil pan drain plug gaskets
Installation Notes
- Place an appropriate drain pan beneath the oil pan drain plug.
- Remove the drain plug and allow the oil to drain according to the engine manufacturer’s service procedure.
- Remove the old gasket and clean the drain plug and mating surface. Make sure both surfaces are free of oil residue, debris, and old sealing material.
- Install one new gasket on the drain plug. Do not stack gaskets.
- Reinstall the drain plug and tighten it to the torque specified in the service manual. Do not overtighten.
- Refill the engine with the specified oil, then inspect the drain plug area for seepage before returning the engine to service.
Troubleshooting & FAQ
How do I confirm whether this gasket fits my engine?
Confirm that your engine’s parts catalog or service manual lists Mercury Marine 27-49955, 8M0077608, or the applicable replacement reference. Check the exact model, year, and serial-number range rather than relying only on engine horsepower.
Is this gasket for the oil pan or the gear case?
The available catalog evidence identifies the matching replacement as an oil pan drain plug gasket. Do not use it for a gear-case drain plug unless your exact parts catalog specifies the same reference for that application.
How many gaskets are included?
This listing includes two aftermarket gaskets. Install one new gasket each time the applicable drain plug is removed, and retain the second gasket as a spare.
Should the gasket be reused?
Drain plug sealing washers are generally intended to be replaced whenever the drain plug is removed. Reusing a compressed or damaged gasket can increase the risk of oil seepage.
Is this an OEM Mercury Marine gasket?
No. This listing is for an aftermarket replacement. The Mercury Marine numbers shown above are reference numbers used to help identify the applicable replacement.
Safety & Important Info
- Allow hot oil and engine components to cool before service.
- Verify the exact part reference, engine model, year, and serial-number range before ordering.
- Use the correct lubricant, fill quantity, and drain-plug torque specified by the engine manufacturer.
- Inspect for leaks after installation and before operating the engine.
- This is an aftermarket replacement, not an OEM component.
About Sea Sierra
- Marine replacement parts selected for common service and repair applications.
- Product references are provided to support part-number comparison and fitment checks.
- For the most reliable match, compare the original part and consult the manufacturer’s parts documentation.
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.
