Cylinder Head Cover Gasket – Fits Mercury/Tohatsu 8-9.9HP (Replaces 5041271, 3V1-01024-0)
Cylinder Head Cover Gasket – Fits Mercury/Tohatsu 8-9.9HP (Replaces 5041271, 3V1-01024-0) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Cover Gasket – Fits Mercury/Tohatsu 8-9.9HP (Replaces...
Product Details
This is a high-quality aftermarket Cylinder Head Cover Gasket designed for Mercury and Tohatsu 8HP and 9.9HP 4-Stroke (209cc) outboard engines. It ensures a precise seal to prevent oil leaks and maintain engine performance. Made from durable materials, it provides a reliable, long-lasting solution for your engine maintenance needs.
This part is a direct replacement for Mercury 27-803508017, Evinrude/Johnson 5041271, Tohatsu/Nissan 3V1-01024-0, and Sierra 18-60917.
- Engineered for a direct fit, requiring removal of the cylinder head cover for installation.
- Creates a secure seal to prevent compression loss and oil leaks.
- The package contains a single gasket for one engine service.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Mercury | 27-803508017 / 803508017 |
| Evinrude / Johnson / OMC / BRP | 5041271 |
| Tohatsu / Nissan | 3V1-01024-0 / 3V1010240 / 3V1010240M |
| Sierra | 18-60917 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Mercury and Mariner outboards, this gasket is compatible with the 209cc 4-stroke 8HP and 9.9HP models.
For Tohatsu and Nissan outboards, this gasket fits the MFS8/MFS9.9 and NSFS8/NSFS9.9 series engines.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Mercury | 8HP (209cc) | 8 | 4-Stroke | 27-803508017 / 803508017 | |
| Mercury | 9.9HP (209cc) | 9.9 | 4-Stroke | 27-803508017 / 803508017 | |
| Tohatsu | MFS8 | 8 | 4-Stroke | 3V1-01024-0 / 3V1010240 / 3V1010240M | |
| Tohatsu | MFS9.9 | 9.9 | 4-Stroke | 3V1-01024-0 / 3V1010240 / 3V1010240M | |
| Nissan | NSFS8 | 8 | 4-Stroke | 3V1-01024-0 / 3V1010240 / 3V1010240M | |
| Nissan | NSFS9.9 | 9.9 | 4-Stroke | 3V1-01024-0 / 3V1010240 / 3V1010240M |
Technical Specs
- Product Type
- Cylinder Head Cover Gasket
- Weight
- 0.01 kg (0.02 lb)
- Dimensions
- 14.5 cm L x 10.0 cm W x 0.3 cm H
What’s in the Box
- 1x Cylinder Head Cover Gasket (Replaces PAF8-05000002)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Thoroughly clean the area around the cylinder head cover to prevent debris from entering the engine.
- Carefully remove any components blocking access to the head cover.
- Unscrew the bolts holding the cover in place and gently remove the cover.
- Remove the old gasket and clean both the cover and the engine block surfaces meticulously. Ensure they are free of old gasket material, oil, and dirt.
- Position the new gasket correctly on the engine block.
- Reinstall the cylinder head cover and tighten the bolts in the sequence and to the torque specified by the manufacturer.
- Reconnect the battery and start the engine, checking carefully for any signs of oil leaks around the cover.
Troubleshooting & FAQ
How do I know if my cylinder head cover gasket is failing?
Common signs include visible oil leaks around the edge of the head cover, a smell of burning oil, or a dirty, grimy engine top due to accumulated oil and dirt. Reduced engine performance can also occur, though less common for this specific gasket.
Is this gasket reusable?
No. This is a single-use crush-style gasket. It is designed to be replaced any time the cylinder head cover is removed to ensure a proper, leak-free seal.
What is the difference between a cylinder head gasket and a cylinder head cover gasket?
A cylinder head gasket seals the engine block to the cylinder head, which is critical for maintaining compression. This part, the cylinder head *cover* gasket (or rocker cover gasket), seals the cover on top of the head to prevent lubricating oil from leaking out.
Do I need to use a sealant with this gasket?
Generally, no sealant is required for this type of gasket. Applying sealant can sometimes interfere with its ability to seal correctly. Always follow the specific instructions in your engine's service manual.
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.
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