326468 Gasket Powerhead Mounting for Johnson Evinrude 40HP 48HP 50HP 55HP 60HP | JLM Marine

326468 Gasket Powerhead Mounting for Johnson Evinrude 40HP 48HP 50HP 55HP 60HP

This powerhead base gasket is engineered for Johnson/Evinrude 2-cylinder outboard motors rated 40–60 HP, covering both traditional Looper models (1976–2005) and modern E-TEC engines (2003–2016). It ensures a reliable seal between the powerhead and the lower unit, preventing water intrusion and maintaining optimal compression.

This aftermarket gasket directly replaces OEM part numbers 0315852, 0321510, 0326468, and 0351018, offering broad compatibility across multiple model years and configurations. It is designed to meet OEM specifications for fit and durability.

• Fits both 3.187" bore Looper and 3.600" bore E-TEC engines
• Direct replacement for multiple Johnson/Evinrude OEM gasket part numbers
• Essential component for powerhead removal and reinstallation

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket sources:

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

Your purchase includes:

• 1 × Powerhead Base Gasket (OEM #326468)

Installation Guide

1. Disconnect the battery and ensure the engine is cool before beginning work.
2. Remove the engine cover and disconnect fuel lines, electrical connections, and control cables from the powerhead.
3. Unbolt the powerhead mounting bolts securing the powerhead to the exhaust housing or mid-section. Keep track of bolt locations.
4. Carefully lift the powerhead assembly off the lower unit, using assistance if needed due to weight.
5. Remove the old base gasket from both mating surfaces, scraping away all remnants and sealant.
6. Clean both surfaces thoroughly with a gasket scraper and solvent to ensure no debris or old gasket material remains.
7. Inspect mating surfaces for warping, corrosion, or damage that may compromise the seal.
8. Position the new gasket on the lower mounting surface, aligning all bolt holes and water passages precisely.
9. Carefully lower the powerhead onto the new gasket, ensuring it seats evenly without shifting the gasket.
10. Install mounting bolts hand-tight first, then torque to manufacturer specifications in a cross-pattern sequence.
11. Reconnect all fuel lines, electrical connectors, and control cables in reverse order of removal.
12. Pressure-test the cooling system (if applicable) and run the engine to verify proper sealing and operation.

Troubleshooting & FAQ

Q: How do I confirm this gasket fits my specific engine?
A: Cross-reference your engine's model, horsepower, bore size, and year with the compatibility table above. You can also verify your engine serial number using the Johnson/Evinrude serial number guide linked in the compatibility section, or check your engine's parts diagram for OEM part numbers 0315852, 0321510, 0326468, or 0351018.

Q: When should I replace the powerhead base gasket?
A: Replace this gasket any time you remove the powerhead for service, repairs, or rebuild. Signs of a failing gasket include water leaking from the powerhead-to-exhaust housing junction, overheating, loss of cooling water flow, or visible gasket deterioration during inspection.

Q: Can I reuse the old gasket if it looks intact?
A: No, gaskets are designed for single use. Reusing an old gasket—even if it appears undamaged—can result in improper sealing, water intrusion, and potential engine damage. Always install a new gasket when reassembling the powerhead.

Q: Will this aftermarket gasket perform the same as the OEM version?
A: Yes, this gasket is manufactured to OEM specifications using comparable-grade materials. It provides the same sealing performance, heat resistance, and durability as the original Johnson/Evinrude part.

Q: Do I need to use sealant with this gasket?
A: Consult your engine's service manual. Some applications require a thin coat of gasket sealant on both sides, while others use the gasket dry. Incorrect use of sealant can cause blockages in water passages or compromise the seal.

Q: What's the difference between OEM and aftermarket parts?
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.