Cylinder Head Cover Gasket – Fits Johnson/Evinrude 20-35 HP Outboards (Replaces 327674, 324325, 777388)

Cylinder Head Cover Gasket – Fits Johnson/Evinrude 20-35 HP Outboards (Replaces 327674, 324325, 777388)

This cylinder head cover gasket is designed for Johnson/Evinrude 2-stroke 20-35 HP outboard motors manufactured between 1979 and 2005. It is engineered to meet or exceed original equipment specifications, ensuring a reliable seal.

It serves as a direct replacement for multiple OEM part numbers, including Johnson/Evinrude 327674, 324325, and 777388, providing broad compatibility across a range of engines.

• Manufactured from high-quality, OEM-specification gasket material to prevent oil leaks.
• Designed for a direct replacement fit to simplify installation.
• Helps maintain engine integrity and performance by ensuring a proper seal.

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 Serial Number Guide.

Technical Specifications

Package Contents

1 x Cylinder Head Cover Gasket (327674)

Installation Guide

1. Ensure the engine is off, cool, and the battery is disconnected for safety.
2. Locate and unfasten the bolts securing the cylinder head cover.
3. Carefully remove the cover and the old gasket. Take note of the orientation.
4. Thoroughly clean both the cylinder head and cover mating surfaces. All old gasket material and residue must be removed.
5. Position the new gasket correctly on the cylinder head.
6. Reinstall the cover and tighten the bolts in the sequence and to the torque specified in your engine's service manual.
7. Reconnect the battery. After starting the engine, check carefully for any oil leaks around the cover.

Troubleshooting & FAQ

How do I confirm this gasket fits my engine?
First, check your engine's model and year against the detailed compatibility table on this page. Second, verify your existing part number matches one of the cross-reference numbers listed, such as OEM part 327674 or its predecessors 324325 and 777388.

What are common signs of a failing cylinder head cover gasket?
Key indicators include visible oil leaks around the head cover, a distinct burning oil smell, unexplained oil loss, or poor engine performance. Replacing a faulty gasket is critical to prevent further engine damage.

Do I need to use sealant with this gasket?
This gasket is designed for a dry-fit installation. Applying sealants is generally not recommended unless specifically required by your engine's service manual, as it can interfere with proper sealing.

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.