Cylinder Head Gasket – Fits Yamaha & Mercury Mariner 40HP 2-Stroke (Replaces 676-11181-01)
Cylinder Head Gasket – Fits Yamaha & Mercury Mariner 40HP 2-Stroke (Replaces 676-11181-01) is backordered and will ship as soon as it is back in stock.
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Delivery and Shipping
Free standard shipping on all orders under 1 KG
Cylinder Head Gasket – Fits Yamaha & Mercury Mariner 40HP 2-Str...
Product Details
This is a high-quality aftermarket Cylinder Head Gasket – Fits Yamaha & Mercury Mariner 40HP 2-Stroke (Replaces 676-11181-01), designed to create a reliable seal between the cylinder head and the engine block. It is engineered for Yamaha 40HP 2-stroke outboard engines from approximately 1990–1998 and select Mercury Mariner 40HP 2-stroke outboards.
It serves as a direct replacement for Yamaha part numbers including 676-11181-01-00, 676-11181-A2-00, and 676-11181-A1-00, as well as Mercury equivalents 95414/95414M, Sierra 18-3892, and Mallory 9-63956.
- Installs between the cylinder head and engine block.
- Made from a high-temperature resistant composite material for durability.
- Ensures a proper seal to maintain engine compression and prevent leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 676-11181-01-00 |
| Yamaha | 676-11181-A2-00 |
| Yamaha | 676-11181-03-00 |
| Yamaha | 676-11181-A0-00 |
| Yamaha | 676-11181-A1-00 |
| Mercury | 95414 / 95414M |
| Mercury / Mariner | 83332M / 97702M |
| Sierra | 18-3892 |
| Mallory | 9-63956 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
This part is known to fit a range of Yamaha 40HP 2-stroke outboards from the 1990s.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | 40QE/QM/QWC | 40 | 2-Stroke | 1990–1998 | 676-11181-01 | |
| Yamaha | C40PLRV | 40 | 2-Stroke | 1997 | 676-11181-A1-00 | |
| Yamaha | C40ELRV | 40 | 2-Stroke | 1997 | 676-11181-A1-00 | |
| Yamaha | C40MSHV | 40 | 2-Stroke | 1997 | 676-11181-A1-00 | |
| Yamaha | C40ESHV | 40 | 2-Stroke | 1997 | 676-11181-A1-00 | |
| Yamaha | 40B/40C/40D/40F | 40 | 2-Stroke | 676-11181-01-00 | ||
| Mercury | 40 | 40 | 2-Stroke | 95414/95414M |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation Location
- Between cylinder head and engine block
- Material
- High-temperature resistant composite
- Product Dimensions
- 9.5" L x 6.5" H x 0.19" W
- Weight
- 0.05 kg (0.11 lb)
What’s in the Box
- 1 x Cylinder Head Gasket (Replaces 676-11181-01-00)
Installation Notes
- Disconnect the battery and ensure the engine is cool.
- Remove the engine cowling and any interfering components to access the cylinder head.
- Carefully disconnect spark plug wires and remove the cylinder head bolts in the sequence recommended by your service manual.
- Lift the cylinder head off the engine block and remove the old gasket.
- Thoroughly clean both the cylinder head and engine block surfaces, removing all old gasket material and debris.
- Position the new gasket correctly on the engine block; do not use any sealant unless specified by the manufacturer.
- Carefully place the cylinder head back onto the block.
- Install and tighten the head bolts in the correct sequence and to the specified torque values.
- Reconnect spark plug wires and all other components. Reconnect the battery and test the engine.
Troubleshooting & FAQ
How do I know if my cylinder head gasket is failing?
Common symptoms of a blown head gasket include engine overheating, loss of power, white smoke from the exhaust (coolant burning), or a milky appearance in the engine oil (oil and coolant mixing). A compression test can help diagnose the issue definitively.
Is this gasket compatible with my specific Mercury engine serial number?
This gasket fits select 40HP Mercury Mariner 2-stroke models. Because full compatibility lists are extensive and vary by serial number, we strongly advise cross-referencing the OEM part number (e.g., 95414, 95414M) from your engine's parts diagram before ordering.
Can I reuse my old cylinder head bolts?
It is best practice to use new cylinder head bolts, as they can stretch when torqued to specification (Torque-to-Yield bolts). Reusing old bolts may result in improper clamping force and lead to premature gasket failure.
Do I need to apply sealant to this gasket?
Most modern head gaskets like this one are designed to be installed dry. Applying sealant can interfere with the gasket's ability to seal correctly and may cause it to fail. Always follow the instructions in your engine's service manual.
What is the difference between this and a genuine Yamaha part?
This is a high-quality aftermarket part designed to meet or exceed OEM specifications. While it is not sourced from the original equipment manufacturer, it provides comparable performance and sealing capability at a better value.
How often should a head gasket be replaced?
A cylinder head gasket is not a routine maintenance item. It is designed to last the life of the engine and is typically only replaced when it has failed due to overheating or other engine problems.
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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