Gasket-Head – Fits Mercury/Mercruiser 75-200 HP 4-Stroke Outboards (Replaces 27-8M0024565)
Gasket-Head – Fits Mercury/Mercruiser 75-200 HP 4-Stroke Outboards (Replaces 27-8M0024565) 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-Head – Fits Mercury/Mercruiser 75-200 HP 4-Stroke Outboards ...
Product Details
This aftermarket Gasket-Head is designed for a precise fit on Mercury/Mercruiser 75-115 HP 4-Stroke EFI outboards (2000–Present) and 135-200 HP Verado 4-Stroke 4-cylinder outboards (2005–Present).
It serves as a direct replacement for Mercury/Mercruiser part number 27-8M0024565 and Quicksilver 8M0024565.
- Installation: OEM Direct Replacement
- Fuel System: Designed for gasoline engines
- Engineered for Performance: Built to meet or exceed original equipment standards
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury/Mercruiser | 27-8M0024565 |
| Quicksilver | 8M0024565 |
Engine & Model Compatibility
Confirm your engine model and serial number range in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Mercury | 75 EFI | 75 | 4-Stroke | 1B366823 thru 2B094995 | 27-8M0024565 | |
| Mercury | 80 EFI | 80 | 4-Stroke | 0P459572 thru 2B094995 | 27-8M0024565 | |
| Mercury | 80 EFI | 80 | 4-Stroke | 1B366823 thru 2B094995 | 27-8M0024565 | |
| Mercury | 90 EFI | 90 | 4-Stroke | 1B366823 thru 2B094995 | 27-8M0024565 | |
| Mercury | 100 EFI | 100 | 4-Stroke | 0P459572 thru 2B094995 | 27-8M0024565 | |
| Mercury | 100 EFI | 100 | 4-Stroke | 1B366823 thru 2B094995 | 27-8M0024565 | |
| Mercury | 115 EFI | 115 | 4-Stroke | 1B366823 thru 2B094995 | 27-8M0024565 | |
| Mercury | 135 Verado | 135 | 4-Stroke | 0P514869 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 135 Verado | 135 | 4-Stroke | 1B517159 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 150 Verado | 150 | 4-Stroke | 0P514869 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 150 Verado | 150 | 4-Stroke | 1B517159 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 175 Verado | 175 | 4-Stroke | 0P514869 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 175 Verado | 175 | 4-Stroke | 1B517159 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 200 Verado | 200 | 4-Stroke | 0P514869 & Up | 27-8M0024565 | 4-Cylinder |
| Mercury | 200 Verado | 200 | 4-Stroke | 1B517159 & Up | 27-8M0024565 | 4-Cylinder |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- OEM Direct Replacement
- Fuel Type
- Gasoline
- Dimensions
- 19.50 x 10.75 x 0.13 in (495.3 x 273.05 x 3.3 mm)
- Weight
- 0.44 lb (0.2 kg)
- Warranty
- Standard Manufacturer Warranty
What’s in the Box
- 1 x Gasket-Head (Replaces 27-8M0024565/8M0024565)
Installation Notes
- Disconnect the battery and drain the engine coolant completely.
- Remove the cylinder head cover, intake and exhaust manifolds, and any other components obstructing access to the head bolts.
- Following the manufacturer's service manual, loosen the cylinder head bolts in several passes in the reverse order of the tightening sequence.
- Carefully lift the cylinder head from the engine block. Avoid scratching the mating surfaces.
- Remove the old head gasket. Thoroughly clean the mating surfaces on both the engine block and cylinder head.
- Position the new gasket correctly on the engine block; check for proper orientation.
- Carefully lower the cylinder head back into place over the dowel pins.
- lubricate and install new head bolts. Tighten them in the specified sequence and torque stages according to your service manual.
- Reassemble all components, refill the cooling system, and reconnect the battery.
- Start the engine and check for any coolant or oil leaks.
Troubleshooting & FAQ
How do I know if this head gasket fits my engine?
Verify your engine's serial number against the ranges provided in the "Engine & Model Compatibility" table. This part is specifically designed for certain Mercury/Mercruiser 75-200 HP 4-stroke engine models. Cross-referencing the OEM part number (27-8M0024565) is the most reliable method.
What are the common signs of a blown head gasket?
Typical symptoms include engine overheating, a noticeable loss of power, white smoke from the exhaust (indicating burning coolant), milky or frothy engine oil, and unexplained coolant loss. Any of these signs warrant an inspection.
Does this gasket require sealant during installation?
This gasket is designed to be installed dry. Do not use any additional sealants or adhesives unless explicitly instructed by your engine's official service manual, as this can interfere with proper sealing.
Can I reuse my old cylinder head bolts?
No. Most modern engines, including those listed, use torque-to-yield (TTY) bolts that permanently stretch upon first use. Reusing them can result in improper clamping force and lead to premature gasket failure. Always install new head bolts.
How is an aftermarket part different from OEM?
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.
What is the recommended replacement interval?
Cylinder head gaskets are not considered a routine maintenance part. They are only replaced when there is a failure. With proper installation, a quality aftermarket gasket should last for many years under normal operating conditions.
What are typical shipping speed & cost?
We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.
What is your warranty & return policy?
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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