Exhaust Inner Cover Gasket – Fits Yamaha 40HP 2-Cylinder Commercial Outboard (Replaces 676-41112-A0-00)
Exhaust Inner Cover Gasket – Fits Yamaha 40HP 2-Cylinder Commercial Outboard (Replaces 676-41112-A0-00) is backordered and will ship as soon as it is back in stock.
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Worry-free returns
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Delivery and Shipping
Delivery and Shipping
Free standard shipping on all orders under 1 KG
Exhaust Inner Cover Gasket – Fits Yamaha 40HP 2-Cylinder Commercial...
Product Details
This Exhaust Inner Cover Gasket is a reliable aftermarket component designed to fit Yamaha 40HP 2-Cylinder Commercial outboard engines (1990–1997) and Mercury 40HP Commercial outboard engines.
It serves as a direct interchange for Yamaha part number 676-41112-A0-00 and Mercury part number 27-83338M.
- Designed for direct replacement, ensuring a precise fit.
- Manufactured to meet or exceed factory original equipment specifications.
- Made from durable, high-quality gasket material to prevent exhaust leaks.
Part Number Matrix
Use this matrix to confirm equivalent references across OEM and aftermarket.
| Brand | Part Number |
|---|---|
| Yamaha | 676-41112-A0-00 |
| Mercury | 27-83338M |
Engine & Model Compatibility
Confirm your engine model/year in the table below.
For Yamaha Owners: This part is confirmed to fit the 40HP 2-Cylinder Commercial series from 1990 through 1997.
For Mercury Owners: This part is cross-referenced for 40HP Commercial models. Please verify engine specifications before ordering, as specific years are not available.
| Brand | Model | Rated HP | Stroke | Years | OEM Part No. |
|---|---|---|---|---|---|
| Yamaha | 2-Cylinder Commercial | 40 | 2-Stroke | 1990–1997 | 676-41112-A0-00 |
| Mercury | Commercial | 40 | 27-83338M |
Technical Specs
- Product Type
- Exhaust Inner Cover Gasket
- Installation
- Direct replacement
- Housing Material
- Gasket material (specific composition not specified)
- Product Dimensions
- Height: 7.0 in, Width: 8.5 in, Length: 0.63 in
- Other Technical Attributes
- Factory original equipment specification
What’s in the Box
- 1 x Exhaust Inner Cover Gasket (Replaces 676-41112-A0-00)
Installation Notes
- Ensure the engine is completely cool and disconnect the battery for safety.
- Locate and carefully remove the fasteners securing the exhaust inner cover.
- Gently detach the cover and remove the old gasket. Take note of its orientation.
- Thoroughly clean both mating surfaces on the engine block and the cover. All old gasket material and sealant must be removed for a proper seal.
- Position the new gasket, ensuring all holes align perfectly.
- Re-install the exhaust cover and tighten the fasteners in a star or crisscross pattern to the manufacturer-specified torque values.
- Reconnect the battery, start the engine, and carefully check for any signs of exhaust leaks around the cover.
Troubleshooting & FAQ
How do I confirm this gasket fits my exact engine model?
The most reliable method is to match your engine's original part number to the numbers listed in our Part Number Matrix. If you're unsure, consult your engine's service manual or check the compatibility table on this page. For Mercury engines where the year is not specified, visual comparison with your old part is critical.
What are the signs of a failing exhaust inner cover gasket?
Common symptoms include a noticeable exhaust leak (hissing or ticking sound from the engine), visible soot or black streaks around the exhaust cover, reduced engine performance, and potentially higher engine operating temperatures. A visual inspection may reveal cracks or deterioration in the old gasket.
Can I reuse my old gasket after removing the cover?
No. Gaskets are designed for single use. They compress and deform to create a seal and will not provide a reliable seal if re-installed. Always use a new gasket whenever a sealed component is removed.
How often does this gasket need to be replaced?
This gasket should last for many years under normal conditions. It generally only needs replacement when the exhaust cover is removed for other service or if it fails and an exhaust leak develops.
Is this part different from the original OEM gasket?
This is an aftermarket part designed to function identically to the OEM original. It is manufactured to meet OEM specifications for fit, form, and function, using comparable high-quality materials to ensure a durable and long-lasting seal.
Why are the dimensions important?
The dimensions ensure a perfect fit between the engine block and the exhaust cover, which is essential for creating a proper seal. An incorrectly sized gasket will fail to prevent exhaust leaks, leading to poor performance and potential engine damage.
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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