Water Jacket Gasket – Fits Johnson/Evinrude 60-75HP (Replaces 318609, 766871)

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Product Details

This Water Jacket Gasket provides a reliable seal between the engine block and water jacket cover for Johnson/Evinrude 60 to 75 HP 2-stroke outboard motors manufactured between 1973 and 1988.

It serves as a direct replacement for Johnson/Evinrude part numbers 318609 and 766871/0766871, and is a cross-reference for Sierra 18-2911.

Installs between the engine block and water jacket cover.
Ensures a proper seal to prevent coolant leaks and overheating.
Some inventory may be New Old Stock (NOS), meaning the part is new but packaging may show wear.

Part Number Matrix

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

Brand	Part Number
Johnson/Evinrude	318609
Johnson/Evinrude	766871 / 0766871
Sierra	18-2911

Engine & Model Compatibility

Confirm your engine model/year in the table below.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.
Johnson/Evinrude	60HP	60	2-Stroke	1986–1988	766871, 318609
Johnson/Evinrude	65HP	65	2-Stroke	1973, 1984–1986	766871, 318609
Johnson/Evinrude	70HP	70	2-Stroke	1974–1985	766871, 318609
Johnson/Evinrude	75HP	75	2-Stroke	1975–1988	766871, 318609

Technical Specs

Product Type: Water Jacket Gasket
Installation Location: Engine Block to Water Jacket
Dimensions: 22.0 in. L x 7.0 in. W x 0.38 in. H
Other Attributes: New Old Stock (NOS) condition available

What’s in the Box

1x Water Jacket Gasket (Replaces 766871/0766871, 318609)

Installation Notes

Disconnect the battery and ensure the engine is completely cool before starting.
Drain the engine's cooling system.
Carefully remove the water jacket cover and the old, failed gasket.
Thoroughly clean both the engine block and water jacket cover mating surfaces. Ensure they are free of any old gasket material, sealant, or debris.
Position the new gasket correctly on the engine block. Do not use sealant unless specified by your service manual.
Reinstall the water jacket cover. Tighten the bolts to the manufacturer's specified torque in the correct sequence.
Refill the cooling system with the appropriate coolant.
Reconnect the battery, start the engine, and carefully check for any leaks around the water jacket cover.

Troubleshooting & FAQ

How do I confirm this gasket fits my Johnson/Evinrude engine?

Please review the "Engine & Model Compatibility" table. This part is designed for specific Johnson/Evinrude 60, 65, 70, and 75 HP 2-stroke models made between 1973 and 1988. Verifying your engine's model and year is the best way to ensure correct fitment.

What are the signs of a failed water jacket gasket?

Common symptoms include engine overheating, visible coolant leaks from the side of the engine block, steam from the engine compartment, or a loss of engine performance. You may also notice discolored or "milky" engine oil if coolant is mixing with it.

Should I use sealant with this gasket?

This gasket is typically designed to be installed dry. However, we always recommend consulting your specific engine's service manual. Some minor imperfections on the mating surfaces might benefit from a light, non-hardening sealant, but the manual provides the definitive procedure.

What does "New Old Stock (NOS)" mean?

NOS means the item is an original part that has never been installed but has been in storage for an extended period. The gasket itself is new, though its packaging might be worn, discolored, or damaged from long-term storage.

What is the difference between an OEM and an aftermarket part?

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.

How fast do you ship and what does it cost?

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

What is your warranty and return policy?

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

Pro-Grade Standards: We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
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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