Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 88-140HP (Replaces 318358, 318335)

$27.50 $44.00

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Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 88-140HP (Replaces 318358, 318335) is backordered and will ship as soon as it is back in stock.

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Product Details

This UanofCn Head Gasket and Water Jacket Gasket Set is designed for Johnson and Evinrude 85-140HP V4 outboard engines manufactured between 1973 and 1995, primarily fitting 90° V4 Crossflow models. It provides a reliable seal for the engine's cylinder head and water jacket cover.

The set serves as a direct replacement for Johnson/Evinrude parts 318358 (Head Gasket) and 318335 (Cover Gasket), and also interchanges with Sierra 18-2956, 18-2873-9; GLM 33540, 33530; and Mallory 9-63828, 9-60454.

Engineered for direct-fit installation.
Constructed from durable non-asbestos material with a metal skeleton for enhanced strength.
Includes two essential gaskets for a complete V4 head service.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	318358
Johnson/Evinrude	318335
Sierra	18-2956
Sierra	18-2873-9
GLM	33540
GLM	33530
Mallory	9-63828
Mallory	9-60454

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Years	OEM Part No.	Notes
Johnson/Evinrude	V4	65 JET	1991–1995	318358, 318335
Johnson/Evinrude	V4	80 JET	1991–1996	318358, 318335
Johnson/Evinrude	V4	85	1979–1980, 1991–1995	318358, 318335
Johnson/Evinrude	V4	88	1987–1995	318358, 318335
Johnson/Evinrude	V4	90	1981–1995	318358, 318335
Johnson/Evinrude	V4	100	1979–1995	318358, 318335	Includes Commercial models
Johnson/Evinrude	V4	110	1986–1989	318358, 318335
Johnson/Evinrude	V4	115	1973–1995	318358, 318335
Johnson/Evinrude	V4	135	1973–1976	318358, 318335
Johnson/Evinrude	V4	140	1977–1984	318358, 318335
Johnson/Evinrude	V4	1.6L	1983–1990	318358, 318335	1600CC (1988)
OMC Stern Drive	V4	90		318335	Cover gasket only

Technical Specs

Product Type: Head and Cover Gasket Set
Installation: Direct replacement
Material: Non-asbestos Gasket with Metal Skeleton
Housing Color: Black
Dimensions: 28.5" L x 18.5" W x 1.5" H
Manufacturer: UA-OFN Marine Parts R&D Manufacturer
UPC: 788934575329

What’s in the Box

1 x Head Gasket (Replaces 318358)
1 x Water Jacket Cover Gasket (Replaces 318335)

Installation Notes

Disconnect the battery and drain the engine's cooling system completely.
Carefully remove the cylinder head cover and any interfering components.
Loosen and remove the cylinder head bolts in the reverse order specified by the manufacturer's service manual to prevent head warping.
Remove the old head gasket and water jacket gasket. Thoroughly clean all mating surfaces on the engine block and cylinder head, ensuring they are free of old gasket material, oil, and debris.
Position the new head gasket and water jacket gasket correctly. Do not use sealant unless specifically required by your service manual.
Reinstall the cylinder head and torque the bolts in the correct sequence and to the specified values. This is critical for a proper seal.
Reassemble all remaining components, refill the cooling system, and reconnect the battery.
Start the engine and check for any leaks around the cylinder head and cover.

Troubleshooting & FAQ

How do I know if this is the right gasket set for my engine?

Verify your engine's model, horsepower, and year against the compatibility table. It is also essential to cross-reference the OEM part numbers (318358, 318335) listed in your service manual with those provided in the product description.

What are the signs of a failed head gasket?

Common symptoms include engine overheating, loss of power or compression, water in the engine oil (milky appearance), or white smoke from the exhaust. A visual inspection may also reveal water or oil leaks from the cylinder head area.

What is the difference between the head gasket and the water jacket gasket?

The head gasket (318358) seals the combustion chamber between the cylinder head and the engine block. The water jacket cover gasket (318335) seals the cover that encloses the cooling passages around the cylinders, preventing external water leaks.

Is any sealant required during installation?

These gaskets are typically designed to be installed dry. Applying sealants can interfere with the gasket's ability to seal properly. Always follow the specific instructions in your engine's official service manual.

How often should these gaskets be replaced?

Head gaskets are not a regular maintenance item. They are typically replaced only when the cylinder head is removed for other service or if the gasket has failed.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). It is 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 will appear at checkout where available.

Warranty & returns

This product is covered by a 1-year warranty against manufacturing defects under normal use. If any issues arise, contact our support team with your order details. Returns are accepted within our standard window, provided the item is unused and in its original condition. Please 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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