Air Silencer Gasket – Fits Johnson/Evinrude 50-75 HP Outboards (Replaces 321794)

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Product Details

This replacement Air Silencer Gasket ensures a proper seal between the air silencer and carburetor assembly on Johnson/Evinrude 50-75 HP 3-cylinder outboard engines manufactured between 1977 and 2001. It is designed to meet or exceed original equipment specifications for reliable performance.

It serves as a direct interchange for Johnson/Evinrude part 321794, Sierra 18-0989, and other aftermarket equivalents.

Engineered for a direct-fit installation.
Mounts directly between the air silencer and carburetor.
Constructed from durable, OEM-specification materials for a long service life.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	321794
Sierra	18-0989
Pro Marine	Gasket Air Silencer
RAREELECTRICAL	321794

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Designed for specific Johnson and Evinrude 3-cylinder outboard models. Please verify your engine's horsepower and year range to ensure compatibility.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	3-cylinder outboards	70	2-Stroke	1977–2001	321794
Johnson/Evinrude	3-cylinder outboards	75	2-Stroke	1977–1988	321794
Johnson/Evinrude	3-cylinder outboards	60	2-Stroke	1986–2001	321794
Johnson/Evinrude	3-cylinder outboards	65	2-Stroke	1984–2001	321794

Technical Specs

Product Type: Air Silencer Gasket
Installation: Direct replacement
Fuel Type: Gasoline
Connection: Mounts between air silencer and carburetor assembly
Housing Material: OEM specification material
Housing Color: Black
Product Dimensions: 24.0" L x 21.0" W x 5.0" H
Other Technical Attributes: For use with 3-cylinder outboard engines

What’s in the Box

1 x Air Silencer Gasket (321794)

Installation Notes

Disconnect the battery and ensure the engine is cool before beginning work.
Carefully remove the air silencer cover and assembly to access the old gasket.
Clean both mating surfaces thoroughly to remove any old gasket material or debris.
Install the new gasket, ensuring it is correctly aligned with the mounting holes.
Reinstall the air silencer assembly and cover, tightening fasteners to the manufacturer’s specified torque.
Reconnect the battery and test the engine for proper operation.

Troubleshooting & FAQ

How do I know if this gasket fits my specific engine model?

This gasket is designed for Johnson/Evinrude 50-75 HP 3-cylinder outboards from 1977–2001. Please review the 'Engine & Model Compatibility' table on this page and compare the OEM part number (321794) to your service manual to confirm an exact match.

What are the signs of a failed air silencer gasket?

A failing gasket can cause an air leak, leading to symptoms like a rough idle, poor engine performance, stalling, or an unusual whistling or hissing sound from the engine compartment. Visual inspection may reveal cracks or brittleness in the old gasket.

How often should this gasket be replaced?

This gasket does not have a fixed replacement interval. It should be replaced whenever the air silencer is removed for service, or if you notice any signs of a leak or gasket failure.

Is this gasket different from the original OEM part?

While this is an aftermarket part, it is manufactured to meet or exceed OEM specifications for fit, form, and function. It is made from comparable materials to ensure a reliable seal and long service life.

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

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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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