Head and Cover Gasket Set – Fits Johnson/Evinrude 18-35 HP Outboards (Replaces 765012, 327674)

Head and Cover Gasket Set – Fits Johnson/Evinrude 18-35 HP Outboards (Replaces 765012, 327674)

This head and cover gasket set is designed for Johnson/Evinrude 18-35 HP 2-Stroke outboard engines manufactured between 1979 and 2001. It provides a reliable seal to maintain engine compression and prevent fluid leaks.

This kit serves as a direct replacement for Johnson/Evinrude part numbers 765012, 327674, 324324, and 329419, as well as Sierra 18-3899, Sierra 18-3803, GLM 34570, and GLM 33700.

• Installation Method: Direct OEM replacement fit.
• Material Construction: Made from high-quality, non-asbestos gasket material with an integrated metal skeleton for enhanced durability and sealing.
• Quality Standard: Manufactured in an ISO9002 certified facility to meet precise OEM specifications.

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 and Cover Gasket Set (Replaces 765012, 327674)

Installation Guide

Always follow your engine's service manual for detailed instructions. The general process is as follows:

1. Safety First: Disconnect the battery and ensure the engine is cool.
2. Drain Fluids: Drain the engine coolant to prevent spills.
3. Remove Components: Detach any components blocking access to the cylinder head, such as the intake and exhaust manifolds.
4. Remove Head Cover: Unbolt and remove the cylinder head cover.
5. Remove Cylinder Head: Loosen the cylinder head bolts in the sequence specified by your service manual to prevent warping. Lift the head off the block.
6. Clean Surfaces: Thoroughly clean the mating surfaces of both the engine block and the cylinder head. Ensure they are free of old gasket material, oil, and debris.
7. Position New Gasket: Place the new head gasket onto the engine block, ensuring it aligns with the dowel pins and cylinder bores. Do not use any sealant unless specified by the manufacturer.
8. Reinstall Head: Carefully place the cylinder head back onto the block.
9. Torque Bolts: Install and tighten the head bolts in the correct sequence and to the torque specifications outlined in your service manual. This is critical for a proper seal.
10. Reassemble: Reattach the head cover, manifolds, and all other components.
11. Final Steps: Refill the engine with coolant, reconnect the battery, and start the engine. Check carefully for any signs of leaks.

Troubleshooting & FAQ

How do I confirm this fits my engine?
Check the 'Compatible Engine Models' table and cross-reference your engine's model, year, and HP. You can also use the 'Part Number Cross-Reference' to match your existing part number. For Johnson/Evinrude owners, our serial number guide can also help you verify your model.

What are the signs of a failed head gasket?
Common signs include engine overheating, a noticeable loss of power or compression, water or oil leaking externally from the head-block joint, or a milky, emulsified appearance in the engine oil, which indicates coolant is mixing with it.

What is the difference between this gasket set and an OEM part?
This is an aftermarket replacement part. It is engineered to meet or exceed original OEM specifications using high-quality non-asbestos materials with a metal skeleton for durability and reliable sealing performance.

OEM vs. Aftermarket?
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.

How fast do you ship and how much does it cost?
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.

What is your warranty and return policy?
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.