Cylinder Block Cover Gasket – Fits Mercury Outboard 6-15 HP (Replaces 27-19207002)
Cylinder Block Cover Gasket – Fits Mercury Outboard 6-15 HP (Replaces 27-19207002) 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
Cylinder Block Cover Gasket – Fits Mercury Outboard 6-15 HP (Replac...
Product Details
This is a replacement Cylinder Block Cover Gasket – Fits Mercury Outboard 6-15 HP (Replaces 27-19207002) designed for various Mercury and Mariner 2-stroke outboard engines from the 1990s and later. It provides a reliable seal between the engine block and the cylinder cover, preventing coolant leaks and ensuring proper engine function.
This part is a direct interchange for Mercury part numbers 27-19207002, 27-192071, 27-421202, 27-421201, and 27-42120.
- Installs between the engine block and cylinder cover.
- Engineered to meet or exceed original equipment specifications.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket suppliers.
| Brand | Part Number | Superseded By | Notes |
|---|---|---|---|
| Mercury | 27-42120 | 27-421201 | Superseded |
| Mercury | 27-421201 | 27-421202 | Superseded |
| Mercury | 27-421202 | 27-192071 | Superseded |
| Mercury | 27-192071 | 27-19207002 | Superseded |
| Mercury | 27-19207002 | Current Part |
Engine & Model Compatibility
Confirm your engine model and serial number range in the table below to ensure correct fitment.
This gasket fits various 6–15 HP 2-stroke outboards under the Mercury and Mariner brands. Check your engine's serial number to verify it matches the ranges provided.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 6 | 6 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 8 | 8 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 8 | 8 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 8 | 8 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 9.9 | 9.9 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 9.9 | 9.9 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 10 MARATHON | 10 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 10 SEA PRO | 10 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 10 VIKING | 10 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 15 | 15 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 15 | 15 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 15 | 15 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 15 MARATHON | 15 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0P325500 & Up | 27-19207002 |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 0T980000-0T999999 | 27-19207002 |
| Mercury | 15 SEA PRO | 15 | 2-Stroke | 1B000001 & Up | 27-19207002 |
| Mercury | 15 VIKING | 15 | 2-Stroke | 0P325500 & Up | 27-19207002 |
Technical Specs
- Product Type
- Cylinder Block Cover Gasket
- Installation
- Engine Block to Cylinder Cover
- Dimensions
- Length: 25.5 in, Width: 14.5 in, Height: 0.1 in
- Weight
- 0.014 kg (0.03 lb)
What’s in the Box
- 1 x Gasket-Cylb Cover (27-19207002)
Installation Notes
- Disconnect the negative battery cable and drain the engine's cooling system.
- Remove any components obstructing access to the cylinder block cover.
- Carefully unbolt and remove the cover, followed by the old gasket.
- Thoroughly clean both the cover and the engine block mating surfaces. Remove all old gasket material and residue.
- Position the new gasket, ensuring it aligns correctly with the bolt holes and passages.
- Reinstall the cylinder block cover. Hand-tighten bolts first, then torque them to the manufacturer's specified values in the recommended sequence.
- Reassemble all components removed earlier, reconnect the battery, and refill the cooling system.
- Start the engine and carefully inspect for any leaks around the cover.
Troubleshooting & FAQ
How do I confirm this gasket fits my specific engine model?
Verify your engine's model and, most importantly, its serial number against the compatibility table. Your serial number should fall within one of the specified ranges (e.g., 0P325500 & Up, 0T980000-0T999999) for a confirmed fit.
What are the signs of a failing cylinder block cover gasket?
Common symptoms include visible coolant leaks on the exterior of the engine block, engine overheating, poor performance, or milky, discolored engine oil, which indicates coolant has mixed with the oil.
Is any sealant required when installing this gasket?
Typically, this type of gasket is designed for a dry installation. However, always consult your engine's official service manual for the most accurate procedure, as some applications may require a light application of a specific sealant.
OEM vs. Aftermarket?
This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, it's batch-inspected for consistency.
Shipping speed & cost?
We ship worldwide quickly—typical transit is 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
Warranty & returns?
This part is 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 if the part is unused and in its original condition. See our policy page or reach out for instructions.
Safety & Important Info
- Verify images and specifications against 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.
