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

Head Gasket and Water Jacket Gasket Set – Fits Johnson/Evinrude V4 88–140 HP

This gasket set is designed for Johnson/Evinrude V4 Crossflow 85–140 HP (2-Stroke) outboard engines manufactured between 1973 and 1995. It provides the essential gaskets required to service one cylinder bank of your V4 engine.

This kit serves as a direct replacement for multiple OEM and aftermarket part numbers, ensuring a precise fit and reliable seal for your engine maintenance or rebuild project.

• Includes both the head gasket and water jacket cover gasket for one side.
• Made from high-quality, non-asbestos material with a durable metal skeleton for longevity.
• Note: Two (2) sets are required to service the entire V4 engine.

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.

Technical Specifications

Package Contents

• 1 x Head Gasket (Replaces OEM 318358)
• 1 x Water Jacket/Cover Gasket (Replaces OEM 318335)
• This set provides gaskets for ONE SIDE of the V4 engine; two identical sets are required for a complete engine service.

Installation Guide

Professional installation is recommended. Always consult your engine’s service manual for detailed procedures and torque specifications.

1. Safety First: Disconnect the battery and ensure the engine is cool.
2. Drain Coolant: Drain the engine block's cooling system completely.
3. Remove Components: Detach the engine cover, spark plug leads, ignition coils, and any other components obstructing access to the cylinder head and water jacket cover.
4. Loosen Bolts: Following the sequence in your service manual, carefully loosen and remove the water jacket and cylinder head bolts.
5. Remove Old Gaskets: Gently lift off the water jacket cover and cylinder head. Remove and discard the old gaskets.
6. Clean Surfaces: Thoroughly clean the mounting surfaces on the engine block and cylinder head. Ensure they are free of any old gasket material, sealant, or debris.
7. Position New Gaskets: Carefully place the new head gasket and water jacket gasket in their correct positions. Do not use sealant unless specified by the manufacturer.
8. Reinstall Head & Cover: Re-position the cylinder head and water jacket cover.
9. Torque Bolts: Install and tighten the bolts in the specified sequence and to the correct torque values using a torque wrench. This is critical for a proper seal.
10. Reassemble & Refill: Reinstall all previously removed components, refill the cooling system, and reconnect the battery.
11. Final Check: Start the engine and carefully check for any coolant leaks around the gasket areas.

Troubleshooting & FAQ

Q: How do I confirm this gasket set will fit my engine?

A: Start by checking your engine's model, horsepower, and year against our compatibility table. Next, cross-reference your existing part number with the numbers listed in the "Part Number Cross-Reference" section to ensure it is a direct replacement.

Q: Does this kit include gaskets for the entire engine?

A: No. This kit services one side (one cylinder bank) of a V4 engine. You must purchase two of these sets to replace the head and water jacket gaskets on both sides of your motor.

Q: What are common signs that my head gasket is failing?

A: Common symptoms of a blown head gasket include engine overheating, a noticeable loss of power or compression, water or "milky" residue in the engine oil, or excessive white smoke from the exhaust once the engine has warmed up.

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.