Cylinder Head Gasket – Fits Yamaha F300/F350 V8 4-Stroke Outboards (Replaces 6AW-11182-00-00)
Cylinder Head Gasket – Fits Yamaha F300/F350 V8 4-Stroke Outboards (Replaces 6AW-11182-00-00) is backordered and will ship as soon as it is back in stock.
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Cylinder Head Gasket – Fits Yamaha F300/F350 V8 4-Stroke Outboards ...
Product Details
This is a replacement Cylinder Head Gasket – Fits Yamaha F300/F350 V8 4-Stroke Outboards for the starboard (right) side of the engine block. It is designed for compatibility with Yamaha 300–350 HP, V8 4-stroke models manufactured from 2007 to the present.
This component serves as a direct interchange for Yamaha part number 6AW-11182-00-00 and EMP 27-00646.
- Installs on the starboard (right) side of the engine.
- Engineered with OEM-grade composite materials for a reliable seal.
- Designed as a direct-fit replacement for straightforward installation.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 6AW-11182-00-00 |
| EMP | 27-00646 |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. | Notes |
|---|---|---|---|---|---|---|
| Yamaha | F300 | 300 | 4-Stroke | 2007–present | 6AW-11182-00-00 | Starboard (right) side |
| Yamaha | F350 | 350 | 4-Stroke | 2007–present | 6AW-11182-00-00 | Starboard (right) side |
| Yamaha | FL300 | 300 | 4-Stroke | 2007–present | 6AW-11182-00-00 | Starboard (right) side |
| Yamaha | FL350 | 350 | 4-Stroke | 2007–present | 6AW-11182-00-00 | Starboard (right) side |
Technical Specs
- Product Type
- Cylinder Head Gasket
- Installation
- Starboard Side (Right)
- Housing Material
- OEM Composite Materials
- Dimensions
- 58.5cm L x 27.5cm W x 0.5cm H
- Fitting Type
- Direct Fit
- Other Technical Attributes
- This is the right side (starboard) cylinder head gasket for Yamaha V8 4-stroke outboard engines
What’s in the Box
- 1 x Gasket, Cylinder Head 2 (6AW-11182-00-00)
Installation Notes
- Disconnect the battery and drain the engine coolant/oil as required.
- Remove the engine cover, exhaust manifolds, intake components, and any other parts obstructing access to the cylinder head.
- Carefully unbolt and remove the cylinder head. Keep fasteners organized.
- Remove the old head gasket and thoroughly clean any residue from both the engine block and cylinder head surfaces. Ensure both surfaces are completely flat and free of debris.
- Position the new gasket correctly on the engine block; check for any "UP" or "FRONT" markings.
- Carefully reinstall the cylinder head and torque the head bolts in the sequence and to the specifications recommended by the manufacturer.
- Reassemble all previously removed components.
- Refill engine fluids and reconnect the battery.
- Start the engine and carefully check for any coolant, oil, or exhaust leaks around the gasket.
Troubleshooting & FAQ
Is this the correct gasket for my engine?
This is the starboard (right) side gasket for Yamaha V8 4-stroke outboard engines (300–350 HP) from 2007 to present. Verify your model and year in the compatibility table. Do not use this for the port (left) side, which requires part number 6AW-11181-00-00.
What are the signs of a bad cylinder head gasket?
Common symptoms include engine overheating, white smoke from the exhaust (burning coolant), loss of compression, milky or discolored engine oil, and bubbling in the coolant reservoir. These signs indicate a leak between the combustion chamber and coolant or oil passages.
Should I use sealant with this head gasket?
No. This gasket is designed to be installed dry. Applying sealants can interfere with its ability to crush and seal correctly, potentially causing leaks or premature failure. Always install on clean, dry surfaces.
Can a head gasket be reused?
Never reuse a cylinder head gasket. Head gaskets are "crush" type gaskets that deform upon installation to create a perfect seal. Once torqued down and heat-cycled, they will not seal properly a second time.
Why is there a separate gasket for the right and left side?
The V-engine configuration results in cylinder heads that are often mirror images of each other, not identical. Coolant and oil passages may be located in different positions, requiring a specific gasket for each side to ensure proper fluid flow and sealing.
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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