Carburetor Mounting Gasket – Fits Johnson/Evinrude Outboards (Replaces OMC 318932)

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Product Details

This Carburetor Mounting Gasket provides a reliable seal between the carburetor and intake manifold on a wide range of Johnson/Evinrude outboards from 35 to 235 HP, covering models produced between 1977 and 1988.

It serves as a direct interchange for Sierra 18-0961-9 and OMC part number 318932.

Engineered for a direct-fit installation.
Constructed from high-quality paper/composite gasket material to ensure a proper seal.
Sold in a convenient pack of two for servicing engines with multiple carburetors or for keeping a spare.

Part Number Matrix

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

Brand	Part Number
Sierra	18-0961-9
OMC	318932

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket is designed for a wide variety of Johnson/Evinrude outboard engines. Please verify your specific model and year range to ensure correct fitment.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	V4 Outboards	100-140	2-Stroke	1977–1988	318932
Johnson/Evinrude	V6 Outboards	150-235	2-Stroke	1977–1988	318932
Johnson/Evinrude	3-Cylinder	60-75	2-Stroke	1977–1988	318932
Johnson/Evinrude	4-Cylinder Inline	85-115	2-Stroke	1977–1988	318932
Johnson/Evinrude	Select 2-Cylinder Models	35-55	2-Stroke	1977–1988	318932

Technical Specs

Product Type: Carburetor Mounting Gasket
Installation: Direct replacement
Package Contents: Sold in packs of 2
Fuel Type: Gasoline
Connection: Between carburetor and intake manifold
Housing Material: Paper/composite gasket material
Housing Color: Tan/brown
Dimensions: Height: 5.13", Width: 4.0", Length: 1.13"
Fitting Type: Flat gasket

What’s in the Box

2 x Carburetor Mounting Gasket (Replaces OMC 318932)

Installation Notes

Disconnect the battery and shut off the fuel supply.
Remove the engine cover and airbox/flame arrestor to access the carburetor.
Carefully disconnect any fuel lines, linkages, and electrical connectors attached to the carburetor.
Unbolt and remove the carburetor from the intake manifold.
Remove the old gasket. Thoroughly clean both mating surfaces to remove all old gasket material and residue.
Position the new gasket correctly onto the intake manifold.
Reinstall the carburetor and tighten the mounting bolts to the manufacturer's specified torque.
Reconnect all fuel lines, linkages, and connectors.
Reinstall the airbox and engine cover.
Turn on the fuel supply, reconnect the battery, and check for any leaks before starting the engine.

Troubleshooting & FAQ

How do I know if this gasket fits my engine?

This gasket fits a wide range of Johnson/Evinrude outboards from 35-235 HP, manufactured between 1977 and 1988. Always verify your engine model and year against the compatibility list and check for OEM part number 318932 in your service manual to ensure a perfect match.

What are the signs of a failing carburetor gasket?

Common symptoms include a rough idle, engine stalling, fuel leaks around the carburetor base, or a hissing sound indicating a vacuum leak. Poor engine performance and decreased fuel efficiency can also point to a faulty gasket.

Do I need to use sealant with this gasket?

Generally, this type of paper/composite gasket is designed to be installed dry. Applying sealant can sometimes cause it to swell or break down prematurely, leading to leaks. Always follow your engine's service manual for the most accurate installation instructions.

Why is this sold in a two-pack?

This part is sold in a pack of two for convenience, as many compatible engine configurations (like V4 and V6 models) have multiple carburetors. Servicing all carburetors at the same time is recommended for balanced performance. It also provides a useful spare for future maintenance.

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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