Cylinder Head Cover Gasket – Fits Yamaha 40HP 2-Stroke (Replaces 6E9-11193-A0-00)

$7.14 $11.00

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Cylinder Head Cover Gasket – Fits Yamaha 40HP 2-Stroke (Replaces 6E9-11193-A0-00) is backordered and will ship as soon as it is back in stock.

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Product Details

This is a direct-fit Cylinder Head Cover Gasket – Fits Yamaha 40HP 2-Stroke (Replaces 6E9-11193-A0-00) engines from 1990–1998. It is designed for both commercial and recreational models, including the Yamaha 40F and 40Q series, ensuring reliable sealing and performance.

This part provides a direct interchange for Yamaha part numbers 6E9-11193-A0-00 and 6E9-11193-00-00, Mercury 27-97704M, and Sierra 18-99106.

Installation Method: Installs as a direct replacement for the original part.
Design: Engineered to meet or exceed OEM-equivalent specifications.
Operating Environment: Designed for use with gasoline (petrol) engines in marine conditions.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket brands.

Brand	Part Number	Notes
Yamaha	6E9-11193-A0-00	Primary OEM
Yamaha	6E9-11193-00-00	Superseded by 6E9-11193-A0-00
Mercury	27-97704M	OEM Equivalent
Sierra	18-99106	Aftermarket Replacement

Engine & Model Compatibility

Confirm your engine model and year in the table below to ensure correct fitment.

For Yamaha Engines: This gasket fits specific 40 HP commercial and recreational two-stroke models produced between 1990 and 1998.

For Mercury Engines: This part is compatible with select 40 HP commercial two-stroke outboards from 1991 to 1997.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Yamaha	40F	40	2-Stroke	1990–1998	6E9-11193-A0-00
Yamaha	40Q	40	2-Stroke	1990–1998	6E9-11193-A0-00
Yamaha	CV40ED (6R60)	40	2-Stroke	1990–1991	6E9-11193-A0-00	Commercial model
Mercury	40HP Commercial	40	2-Stroke	1991–1997	27-97704M

Technical Specs

Product Type: Cylinder Head Cover Gasket
Installation: Direct replacement
Fuel Type: Gasoline (Petrol)
Housing Material: Gasket material (paper/composite)
Dimensions: 12.0" H x 8.0" W x 0.25" L
Other Technical Attributes: OEM-equivalent design

What’s in the Box

1 x Gasket, Head Cover 1 (Replaces 6E9-11193-A0-00)

Installation Notes

Ensure the engine is completely cool and disconnect the battery for safety.
Remove any external components that obstruct access to the cylinder head cover.
Carefully unfasten and remove the head cover, then peel off the old gasket.
Thoroughly clean the mating surfaces of both the cylinder head and the cover, ensuring they are free of any old material or residue.
Place the new gasket into position on the cylinder head, aligning it correctly.
Reinstall the head cover. Tighten the bolts in the sequence and to the torque values specified in your engine's service manual.
Re-attach all components removed in step 2 and reconnect the battery.
After reassembly, start the engine and carefully inspect for any oil leaks around the cover.

Troubleshooting & FAQ

How do I know if this gasket will fit my engine?

The best way to confirm fitment is to check your original part number against the references in our Part Number Matrix. You should also consult the Engine & Model Compatibility table to see if your specific model and year are listed.

What are the signs of a failed head cover gasket?

Common symptoms include visible oil leaks around the edges of the cylinder head cover, a smell of burning oil, or a dirty, grimy engine bay due to accumulated oil and dirt.

Is sealant required with this gasket?

Typically, this type of gasket is designed to be installed dry. However, always consult your engine-specific service manual, as some applications may recommend a small amount of sealant in certain areas, like sharp corners.

What is the difference between a head gasket and a head cover gasket?

A head cover gasket seals the join between the engine block's top cover (valve cover) and the cylinder head to prevent oil from leaking out. A head gasket, which is a more critical component, seals the cylinder head to the engine block itself, containing combustion pressure and coolant.

My engine model isn't listed, but the part number matches. Will it fit?

If your old part's number is listed in our Part Number Matrix, there is a very high probability of a match. Our compatibility lists are extensive but may not cover every single sub-model. Cross-referencing by part number is a reliable method.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It's built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility and batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit is 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 and specifications against 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

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