Gasket – Fits Mercury Marine/Mercruiser, Outboards & MerCruiser (Replaces 27-46111, 27-72488, 27-85492, 27-854921, 27-854922)
Gasket – Fits Mercury Marine/Mercruiser, Outboards & MerCruiser (Replaces 27-46111, 27-72488, 27-85492, 27-854921, 27-854922) 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
Gasket – Fits Mercury Marine/Mercruiser, Outboards & MerCruiser...
Product Details
This is a high-quality aftermarket Gasket designed for specific Mercury Marine and Mercruiser outboard and sterndrive engines, including 30 JET and 40 (4 CYL.) models with specified serial numbers. It ensures a precise seal for the engine's baffle plate to the exhaust cover, preventing leaks and maintaining performance.
It serves as a direct replacement for Mercury Marine part number 27-854924, and its superseded numbers 27-46111, 27-72488, 27-85492, 27-854921, 27-854922, as well as Mercury/Quicksilver MM-854924.
- Installs between the engine baffle plate and exhaust cover.
- Built to meet or exceed original equipment specifications.
- Package contains one gasket.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Notes |
|---|---|---|
| Mercury Marine | 27-854924 | Supersedes 27-46111, 27-72488, 27-85492, 27-854921, 27-854922 |
| Mercury/Quicksilver | MM-854924 | Interchange part number |
Engine & Model Compatibility
Confirm your engine model and serial number range in the table below to ensure correct fitment.
For Mercury Marine engines, this part fits select 30 HP and 40 HP models.
For Mercruiser sterndrives, this part is used on specific 30 JET and 40 (4 CYL.) models.
| Brand | Model | Years / Serial Range |
|---|---|---|
| Mercury Marine | 30 JET | 9570790 and up |
| Mercury Marine | 40 (4 CYL.) | 0C159200 and up |
| Mercury Marine | 40 (4 CYL.) | 9570790 and up |
| Mercury Marine | 40 HP, 30 JET | 0C159200–0G589999 |
| Mercruiser | 30 JET | 9570790 and up |
| Mercruiser | 40 (4 CYL.) | 0C159200 and up |
Technical Specs
- Product Type
- Gasket
- Installation
- Engine (Baffle Plate to Exhaust Cover)
- Dimensions
- Length: 17.13 in (approx. 435.1 mm), Width: 14.0 in (approx. 355.6 mm), Height: 0.13 in (approx. 3.3 mm)
- Weight
- 0.09 lb (0.0408 kg)
- Warranty
- No Warranty
What’s in the Box
- 1 x Gasket (Replaces 27-854924)
Installation Notes
- Ensure the engine is off, cool, and the battery is disconnected before starting.
- Access the baffle plate and exhaust cover assembly on your engine.
- Carefully remove the old, worn gasket. Ensure no debris or old material remains on the mating surfaces.
- Thoroughly clean both the baffle plate and exhaust cover surfaces to guarantee a proper seal.
- Position the new gasket correctly according to your engine's service manual.
- Reassemble the exhaust cover and tighten all fasteners to the manufacturer-specified torque settings.
- Reconnect the battery, start the engine, and carefully inspect for any exhaust or water leaks around the newly sealed area.
Troubleshooting & FAQ
How do I know if this gasket will fit my engine?
Please verify your engine model and serial number against the compatibility list provided. This gasket is specifically for certain Mercruiser and Mercury Marine models like the 30 JET and 40 (4 CYL.) within the specified serial number ranges.
What are the signs of a failing exhaust cover gasket?
Common symptoms include visible exhaust or water leaks around the exhaust cover area, a noticeable change in engine sound (louder or sputtering), or a decrease in overall engine performance and efficiency.
Can I reuse my old gasket?
No. Gaskets are single-use components that compress to create a seal. Reusing an old gasket will likely result in leaks and poor performance. Always install a new gasket whenever a component is removed for service.
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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