Leaf Plate Gasket – Fits Johnson/Evinrude 20-25 HP (Replaces 321573, 326260)

$16.52

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Product Details

This Leaf Plate Gasket is designed for Johnson/Evinrude 20-25 HP, 2-Stroke outboard motors manufactured between 1977 and 2005. It serves as a crucial component within the water pump assembly, ensuring a proper seal for optimal cooling performance.

This part is a direct interchange for Johnson/Evinrude part numbers 321573 and 326260, as well as Sierra part 18-2862.

Engineered for direct replacement and hassle-free installation.
Compatible with standard gasoline outboard engines.
Used in the water pump assembly to maintain cooling system integrity.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	321573
Johnson/Evinrude	326260
Sierra	18-2862

Engine & Model Compatibility

Confirm your engine model/year in the table below.

This gasket fits a range of Johnson/Evinrude 20 HP and 25 HP 2-stroke models. Please check your specific year against the ranges provided.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	Various	20	2-Stroke	1985–1998	321573/326260
Johnson/Evinrude	Various	25	2-Stroke	1977–2005	321573/326260

Technical Specs

Product Type: Leaf Plate Gasket
Installation: Direct replacement
Fuel Type: Compatible with gasoline engines
Housing Material: Gasket material
Product Dimensions: 9.31" H x 6.0" W x 1.06" L
Other Technical Attributes: Used in water pump assembly

What’s in the Box

1 x Leaf Plate Gasket (Replaces 321573/326260)

Installation Notes

Disconnect the battery and ensure the engine is off and completely cool before starting.
Access the water pump housing, typically located on the lower unit of the outboard.
Carefully remove the old, worn leaf plate gasket, taking note of its specific orientation.
Thoroughly clean both mating surfaces to remove any old gasket material, sealant, or debris.
Position the new gasket, ensuring it is properly aligned with all bolt holes and water passages.
Reassemble the water pump housing and torque all fasteners to the manufacturer's specified values.
After reassembly, reconnect the battery and test the engine's cooling system to verify proper water flow.

Troubleshooting & FAQ

How do I know if this gasket will fit my engine?

This gasket is compatible with Johnson/Evinrude 20 HP (1985–1998) and 25 HP (1977–2005) 2-stroke models. To ensure a perfect match, always cross-reference your engine's original part number with 321573 or 326260 before ordering.

What are the signs of a failing leaf plate gasket?

Common signs of failure include engine overheating, reduced water flow from the "telltale" outlet, or visible water leaks around the water pump housing area. A damaged gasket compromises the cooling system's efficiency.

How often should this gasket be replaced?

It is best practice to replace the water pump impeller and all related gaskets, including the leaf plate gasket, during routine cooling system maintenance. This is typically recommended every 1-2 years or 100-200 hours of operation.

Is this gasket different from the OEM part?

This is a high-quality aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications for fit, form, and function. It offers a reliable seal and performance comparable to the original at a better value.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost?

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns?

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs 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 QC.

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