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)

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

Vendor: JLM Marine
Availability: In Stock
Product Type: Gasket
$29.00
$34.00
$29.00
Subtotal: $29.00

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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)

$34.00 $29.00
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)

$34.00 $29.00
Description

Head and Cover Gasket Set – Fits Johnson/Evinrude 18-35 HP Outboards

This head and cover gasket set is designed for Johnson/Evinrude 2-stroke outboard engines in the 18-35 HP range manufactured between 1979 and 2001. It is manufactured from OEM-spec materials to ensure a reliable, direct replacement fit.

This kit provides direct replacements for Johnson/Evinrude part numbers 327674, 324324, 329419, and 765012, along with other aftermarket equivalents.

  • Engine Compatibility: Fits Johnson/Evinrude 18, 20, 25, 28, 30, and 35 HP 2-stroke models.
  • Installation Type: Direct OEM replacement.
  • Package Includes: 1x Head Gasket and 1x Water Cover Gasket.

Part Number Cross-Reference

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

Brand Part Number
Johnson/Evinrude 765012
Johnson/Evinrude 327674
Johnson/Evinrude 324324
Johnson/Evinrude 329419
Sierra 18-3899
Sierra 18-3803
GLM 34570
GLM 33700
Mallory 9-63830

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Johnson/Evinrude Various 18 2-Stroke 1995-2001 765012, 327674
Johnson/Evinrude Various 20 2-Stroke 1985-1997 765012, 327674
Johnson/Evinrude Various 25 2-Stroke 1979-2005 765012, 327674
Johnson/Evinrude Various 25C 2-Stroke 1997-2005 765012, 327674 Commercial models
Johnson/Evinrude Various 28 2-Stroke 1987-1996 765012, 327674
Johnson/Evinrude Various 30 2-Stroke 1984-2005 765012, 327674
Johnson/Evinrude Various 35 2-Stroke 1979-1996 765012, 327674

Technical Specifications

Specification Value
Product Type Gasket Set
Installation Direct OEM replacement
Housing Material OEM-spec materials
Other Technical Attributes Manufactured to OEM specifications

Package Contents

  • 1 x Head Gasket (Replaces: 324324, 329419, 18-3803)
  • 1 x Water Cover Gasket (Replaces: 327674, 18-3899, 33700)

Installation Guide

  1. Disconnect the battery and spark plug wires for safety.
  2. Drain the engine's cooling system completely.
  3. Remove the engine cover and any other components obstructing access to the cylinder head and cover.
  4. Carefully unbolt and remove the cylinder head and water cover. Note the sequence and location of bolts.
  5. Thoroughly clean all old gasket residue from the engine block and cylinder head mating surfaces.
  6. Position the new head gasket and water cover gasket onto the clean surfaces.
  7. Reinstall the cylinder head and water cover. Tighten the bolts to the torque and sequence specified by the manufacturer.
  8. Reconnect all components, including hoses and spark plug wires.
  9. Reconnect the battery.
  10. Refill the cooling system and start the engine, carefully checking for any leaks.

Troubleshooting & FAQ

How do I confirm this gasket set fits my engine?
Check the "Compatible Engine Models" table on this page. Your engine's model, HP, and year should match a line in the table. Cross-referencing your old part number with our "Part Number Cross-Reference" table is also a reliable way to verify fitment.

What are the signs my head gasket is failing?
Common signs include engine overheating, loss of power and compression, milky-white oil, or water/coolant leaking from the engine block and head joint.

How often should head gaskets be replaced?
Head gaskets do not have a fixed replacement interval. They should be replaced whenever the cylinder head is removed for service or if any signs of failure appear.

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.
Shipping

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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