Air Inlet Gasket – Fits Mercury Racing 2.5L EFI (Replaces 27-993163)

$33.82 $54.00

Shipping calculated at checkout.

Worry-free returns

You may return most new, unopened items within 7 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Delivery and Shipping

Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This Air Inlet Gasket provides a precision seal for the air intake system on various Mercury Racing 2.5L (EFI) and 2.5L (EFI-OFFSHORE) outboard engines from the 1990s through the 2000s. It ensures proper air-fuel mixture by preventing unmetered air from entering the engine.

It is a direct interchange for Mercury Marine part numbers 27-993163, 27-993161, and 27-993162.

Engineered for direct-fit installation.
Specifically designed for gasoline Electronic Fuel Injection (EFI) systems.
Seals the air inlet to the engine block for optimal performance.

Part Number Matrix

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

Brand	Part Number
Mercury Marine	27-993163
Mercury Marine	27-993161
Mercury Marine	27-993162

Engine & Model Compatibility

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

Brand	Model	Years	OEM Part No.
Mercury Marine	2.5L (EFI)	0D935271-0G366999	27-993163
Mercury Marine	2.5L (EFI)	0G367000-0G610238	27-993163
Mercury Marine	2.5L (EFI)/(EFI-OFFSHORE)	0G367000-0G610238	27-993163
Mercury Marine	2.5L (EFI)/(EFI-OFFSHORE)	0G610239-0G856999	27-993163
Mercury Marine	2.5L (EFI)/(EFI-OFFSHORE)	0G857000-0T999519	27-993163
Mercury Marine	FORMULA I (2 LITRE EFI)	0A953232-0A953245	27-993163
Mercury Marine	S3000	0D181027 & Up	27-993163

Technical Specs

Product Type: Air Inlet Gasket
Installation: Direct fit
Fuel Type: Gasoline (EFI systems)
Dimensions: 35.0 cm L x 21.5 cm W x 0.3 cm H
Other Technical Attributes: Component of Engine/Powerhead Gasket Set 849770A1
Component of Powerhead/Partial Engine 848040T40

What’s in the Box

1 x Gasket (Replaces 27-993163)

Installation Notes

For a secure, leak-free installation, follow these general steps:

Disconnect the battery and ensure the engine is completely cool before starting.
Remove the engine cowling and any components obstructing access to the air inlet.
Carefully disconnect any sensors and linkages attached to the air inlet assembly, noting their positions.
Unbolt and remove the air inlet assembly from the engine block.
Remove the old gasket and thoroughly clean both mating surfaces. Ensure they are completely free of old gasket material, oil, and debris.
Position the new gasket correctly on the engine block.
Reinstall the air inlet assembly and tighten fasteners to the manufacturer's specified torque in the correct sequence.
Reconnect all sensors and linkages, re-attach the battery, and check for air leaks upon starting.

Troubleshooting & FAQ

What are the signs of a failing air inlet gasket?

Common symptoms include a hissing sound from the engine bay, a rough or unstable idle, decreased engine performance, and potentially a "check engine" light with lean fuel mixture diagnostic codes.

Is this gasket for fuel-injected or carbureted models?

This gasket is specifically designed for the Electronic Fuel Injection (EFI) engine models listed in the compatibility table. It is not intended for carbureted versions.

How can I confirm this part fits my specific 2.5L engine?

The most reliable method is to match your engine's serial number to the serial ranges provided in the "Engine & Model Compatibility" table. Do not rely on the model name alone.

Can I reuse my old gasket?

No. Gaskets are single-use components designed to compress and create a seal. Once compressed and heat-cycled, they lose their sealing ability and must be replaced whenever the component is removed.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It is built to OEM-level specifications with comparable materials. Our parts are manufactured in an ISO 9002 facility and are 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?

This part is covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact our support team with your order details. Returns are accepted within our standard window for unused items 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

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 quality control.

Payment & Security

Payment methods

Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.