Head and Cover Gasket Set – Fits Johnson/Evinrude V4 85-140 HP (Replaces 318358, 318335)

Head and Cover Gasket Set – Fits Johnson/Evinrude V4 85-140 HP (Replaces 318358, 318335)Head and Cover Gasket Set Fits Johnson Evinrude V4 85 140 HP This head and cover gasket set is designed for Johnson Evinrude 85 140 HP, V4 Crossflow, 2 Stroke outboard motors from 19731998. It provides a reliable seal for the cylinder head and exhaust cover, manufactured to meet or exceed original equipment specifications. The set serves as a direct replacement for Johnson Evinrude head gasket 318358 and cover gasket 318335, as well as Sierra part

Head and Cover Gasket Set – Fits Johnson/Evinrude V4 85-140 HP

This head and cover gasket set is designed for Johnson/Evinrude 85-140 HP, V4 Crossflow, 2-Stroke outboard motors from 1973–1998. It provides a reliable seal for the cylinder head and exhaust cover, manufactured to meet or exceed original equipment specifications.

The set serves as a direct replacement for Johnson/Evinrude head gasket 318358 and cover gasket 318335, as well as Sierra part numbers 18-2956 and 18-2873-9.

• Installation: Direct replacement for a straightforward installation.
• Material: Made from high-quality composite gasket material for durability and a proper seal.
• Package Includes: Contains both the cylinder head gasket and the exhaust cover gasket.

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Johnson/Evinrude owners, here’s a guide to help you identify your engine’s serial/model: Johnson/Evinrude Serial Number Guide.

For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

• 1 x Head Gasket (Replaces 318358)
• 1 x Cover Gasket (Replaces 318335)

Installation Guide

1. Safety First: Disconnect the battery and ensure the engine is cool.
2. Drain Fluids: Drain the engine coolant to prevent spills.
3. Access Components: Remove the engine cowl and any components obstructing access to the cylinder head and exhaust cover.
4. Remove Old Gaskets: Carefully unbolt and remove the cylinder head and/or exhaust cover. Remove the old gaskets.
5. Clean Surfaces: Thoroughly clean both mating surfaces, ensuring they are free of old gasket material, oil, and debris.
6. Install New Gaskets: Position the new gaskets correctly. Do not use any sealant unless specified by the manufacturer.
7. Reassemble: Reinstall the cover and/or head. Tighten the bolts in the correct sequence and to the manufacturer's torque specifications.
8. Final Checks: Reconnect all components, refill the coolant, and reconnect the battery. Start the engine and check for any leaks.

Troubleshooting & FAQ

Q: How do I confirm this set fits my V4 engine?
A: Start by checking your OEM part number against our cross-reference list. Then, verify your engine's HP and year falls within the ranges shown in the "Compatible Engine Models" table. For Johnson/Evinrude engines, our serial number guide can help you pinpoint your exact model and year.

Q: What are the common symptoms of a blown head or cover gasket?
A: Signs of a faulty gasket include engine overheating, a noticeable loss of power or compression, milky or discolored oil, or visible water/steam exiting the exhaust. These symptoms indicate a leak between the combustion chamber and cooling passages.

Q: Is this one gasket or a full set?
A: This is a complete set for the V4 Crossflow powerhead, containing one cylinder head gasket (replaces OEM 318358) and one exhaust cover gasket (replaces OEM 318335).

Q: OEM vs. Aftermarket?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.