Powerhead Gasket Set – Fits Johnson/Evinrude 18-35 HP 2-Stroke Outboards (Replaces 0392567, 389206, 392615, 433941)

Powerhead Gasket Set – Fits Johnson/Evinrude 18-35 HP 2-Stroke Outboards (Replaces 0392567, 389206, 392615, 433941)

This powerhead gasket set is designed for a wide range of Johnson/Evinrude 18-35 HP 2-stroke outboard engines manufactured between 1979 and 2005, including specific JET models from 1995–1998. It provides a reliable seal for critical engine components to restore performance and prevent leaks.

This kit serves as a direct replacement for several aftermarket part numbers, including Sierra 18-4307, GLM 39420, and Mallory Marine 9-64114, ensuring broad compatibility.

• Includes a complete set of gaskets for the cylinder head, powerhead base, and related components.
• Designed for use with gasoline-fueled engines.
• Installation is engine-specific; professional installation is recommended.

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 Powerhead Gasket Set (0392567/389206/392615/433941) containing:
  • 2 x Exhaust Manifold Gasket (Sierra 18-0106)
  • 1 x Carburetor Gasket (Sierra 18-0118)
  • 1 x Inner Exhaust Cover Gasket (Sierra 18-0126)
  • 1 x Fuel Pump Gasket (Sierra 18-0850)
  • 1 x Bypass Gasket (Sierra 18-0971)
  • 1 x Leafplate Gasket (Sierra 18-0981)
  • 1 x Powerhead Base Gasket (Sierra 18-2852)
  • 1 x Leaf Plate Gasket (Sierra 18-2862)
  • 1 x Head Gasket (Sierra 18-3803)
  • 1 x Water Cover Gasket (Sierra 18-3899)

Installation Guide

1. Safety First: Ensure the engine is completely turned off, cool to the touch, and disconnected from the battery.
2. Drain Fluids: Drain the engine coolant and oil to prevent spills during disassembly.
3. Disassemble Components: Carefully remove intake and exhaust manifolds, the cylinder head, and any other components blocking access to the powerhead gaskets.
4. Clean Surfaces: Thoroughly remove all traces of old gasket material and residue from the engine block and component mating surfaces. A plastic scraper and a suitable solvent are recommended.
5. Position New Gaskets: Place the new gaskets into their correct positions. Ensure they are aligned perfectly with all bolt holes and passages.
6. Reassemble: Reinstall the components in the reverse order of removal.
7. Torque Bolts: Tighten all bolts in the sequence and to the torque values specified by the engine manufacturer. This is critical for ensuring a proper seal.
8. Refill and Check: Refill the engine with coolant and oil. Reconnect the battery, start the engine, and check carefully for any signs of leaks.

Troubleshooting & FAQ

Q: How do I confirm this gasket set fits my specific engine model?

A: The best way is to check the 'Compatible Engine Models' table on this page. Your engine's model, horsepower (HP), and year range should be listed. You can also use our Johnson/Evinrude Serial Number Guide to verify your model details before ordering.

Q: What are the common signs that my powerhead gaskets need to be replaced?

A: Key symptoms include a noticeable loss of engine compression, milky or discolored oil (indicating water intrusion), visible coolant or oil leaks from the seams of the engine block, and frequent engine overheating.

Q: Is this a complete kit for a powerhead rebuild?

A: This set includes all the essential gaskets required to reseal the powerhead assembly, including gaskets for the cylinder head, powerhead base, exhaust, and intake. Please review the 'Package Contents' list for a detailed breakdown of all included parts.

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.