Outer Exhaust Cover Gasket – Fits Johnson/Evinrude 20-35 HP (Replaces 324323, 0324323)

$4.56

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Product Details

This replacement Outer Exhaust Cover Gasket is engineered to create a reliable seal between the outer exhaust cover and the inner exhaust housing. It is designed specifically for Johnson and Evinrude 20-35 HP, 2-stroke outboard engines manufactured from 1979 to 2004.

It serves as a direct replacement for Johnson/Evinrude OEM part numbers 324323, 0324323, 0777445, and 777445, as well as Sierra 18-0106 / 18-0106-9 and GLM 33690.

Creates a precise seal to prevent exhaust and water leaks.
Engineered to withstand the demanding marine environment.
Designed for a direct-fit installation with no modifications required.

Part Number Matrix

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

Brand	Part Number	Superseded By
Johnson/Evinrude	324323 / 0324323	777445 / 0777445
Sierra	18-0106 / 18-0106-9
GLM	33690

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Evinrude	Various	20	2-Stroke	1981, 1985–1986, 1989, 1992, 1996–1998	324323/0324323
Evinrude	Various	25	2-Stroke	1980–1984, 1986, 1988–1997	324323/0324323
Evinrude	Various	28	2-Stroke	1994, 1996	324323/0324323
Evinrude	Various	30	2-Stroke	1989–1991, 1993	324323/0324323
Evinrude	Various	35	2-Stroke	1979, 1982, 1984, 1986, 1988	324323/0324323
Johnson	Various	20	2-Stroke	1979, 1981, 1986, 1996, 1997	324323/0324323
Johnson	Various	25	2-Stroke	1979, 1981, 1984, 1989–1991, 1994–1998, 2001, 2004	324323/0324323
Johnson	Various	30	2-Stroke	1984, 1989, 1992–1993, 1995–1996, 2001, 2004	324323/0324323
Johnson	Various	35	2-Stroke	1979, 1981–1982, 1988	324323/0324323

Technical Specs

Product Type: Exhaust Cover Gasket
Installation: Outer exhaust cover to inner exhaust housing
Dimensions: Height: 0.5 in; Width: 14.0 in; Length: 22.0 in;
Weight: 0.03 lb (0.014 kg)
Warranty: Manufacturer standard warranty
Other Technical Attributes: Seals between outer exhaust cover and inner exhaust housing

What’s in the Box

1 x Outer Exhaust Cover Gasket (324323/0324323)

Installation Notes

Ensure the engine is off and the battery is disconnected. Allow the engine to cool completely.
Remove the engine cowl and locate the outer exhaust cover.
Carefully unbolt and remove the exhaust cover. You may need to gently pry it loose.
Remove the old gasket. Thoroughly clean any old gasket material or residue from both the cover and the engine block mating surfaces. A plastic scraper can help avoid gouging the metal.
Position the new gasket, making sure it aligns perfectly with the bolt holes and passages.
Reinstall the outer exhaust cover, tightening the bolts in a crisscross pattern to the manufacturer's recommended torque specification to ensure an even seal.
Reconnect the battery and start the engine. Check for any signs of exhaust or water leaks around the newly sealed cover.

Troubleshooting & FAQ

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

This gasket fits a wide range of Johnson/Evinrude 2-stroke outboards from 20-35 HP made between 1979 and 2004. The best way to confirm fitment is to check if your original part number matches one of the direct replacements: 324323, 0324323, 777445, or 0777445. You can also consult the compatibility table on this page.

What are the signs of a failed exhaust cover gasket?

Common symptoms include visible water or exhaust fumes leaking from the seam of the exhaust cover, engine overheating, reduced performance, or an unusually loud exhaust note. A visual inspection may reveal corrosion or degradation of the old gasket.

Do I need to use gasket sealant or adhesive with this part?

In most cases, this gasket is designed to be installed dry. The material is formulated to create a tight seal on its own. However, always consult your engine's official service manual for model-specific recommendations, as some applications may suggest a light tacking agent.

Where is this gasket located on the engine?

This gasket creates the seal between the outer exhaust cover and the inner exhaust housing on the side of the engine powerhead.

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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Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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