Powerhead-Adapter Gasket – Fits Johnson/Evinrude Outboards (Replaces 0342513, 342513)

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Product Details

This Powerhead-Adapter Gasket provides a precision seal between the powerhead and adapter plate on various Johnson/Evinrude 2-Stroke outboard engines. It is engineered to meet or exceed original equipment specifications for a reliable, leak-free fit.

This component is a direct replacement for BRP/Johnson/Evinrude OEM part numbers 0342513 and 342513.

Installs between the engine powerhead and adapter plate.
An essential component for engine rebuilds or powerhead service.
Designed as an OEM-equivalent replacement part.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number
BRP/Johnson/Evinrude	0342513 / 342513

Technical Specs

Product Type: Powerhead Adapter Gasket
Installation: Between powerhead and adapter
Dimensions: 27.5" L x 20.5" W x 0.5" H
Other Technical Attributes: OEM Original Replacement Part

What’s in the Box

1x Gasket, Powerhead-Adapter (0342513/342513)

Installation Notes

Ensure the engine is off and disconnected from the power source.
Carefully disconnect all linkages, fuel lines, and electrical connections from the powerhead.
Remove the powerhead mounting bolts according to the service manual's sequence.
Lift the powerhead from the engine's midsection and set it aside securely.
Remove the old powerhead adapter gasket and discard it.
Thoroughly clean both mating surfaces, ensuring they are free of old gasket material, sealant, and debris.
Position the new gasket correctly on the adapter plate.
Carefully lower the powerhead back into position.
Reinstall the mounting bolts and torque them to the manufacturer's specified values and sequence.
Reconnect all electrical, fuel, and mechanical systems.
After reassembly, check for any exhaust or water leaks around the seal before regular operation.

Troubleshooting & FAQ

How do I know if this gasket will fit my Johnson/Evinrude outboard?

This gasket is a direct replacement for OEM part number 0342513 or 342513. The best way to ensure fitment is to verify the required part number in your engine's official service or parts manual before ordering.

What are the signs of a failing powerhead adapter gasket?

Common symptoms include water intrusion into cylinders, engine overheating, reduced compression, a noticeable loss of performance, or visible water and exhaust leaks between the powerhead and the drive shaft housing.

Should I use sealant or adhesive with this gasket?

In most cases, this gasket is designed to be installed dry. Applying sealants can sometimes interfere with proper sealing. Always follow the specific instructions in your outboard's service manual, as recommendations can vary.

Can I reuse my old gasket if it looks okay?

No. Gaskets compress and deform to create a seal and are designed for single-use only. Reusing an old gasket will likely result in leaks and potential engine damage. Always use a new gasket when servicing the powerhead.

Is this an OEM or aftermarket part?

This listing is for an aftermarket replacement part, not an OEM component. It has been manufactured in an ISO 9001 certified facility to meet or exceed OEM-level specifications using comparable materials and is batch-inspected for quality and consistency.

How fast is shipping?

We ship worldwide, with most orders arriving in 5–15 days via standard free shipping. Expedited shipping options, if available for your location, will be presented at checkout.

What is the warranty and return policy?

This product is covered by a 1-year warranty against manufacturing defects under normal use. If you encounter an issue, please contact our support team with your order details. Returns of unused items in their original condition are accepted within our standard return window.

Safety & Important Info

This product may contain materials known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit the Proposition 65 warnings website.
Verify images and specifications against your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

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Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or quality control.

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