Sierra Lower Unit Seal Kit 18-2660, Replaces 396349, for Johnson/Evinrude Outboard Motors

The Sierra 18-2660 Lower Unit Seal Kit is a gear housing seal kit built for Johnson and Evinrude outboard motors. It supplies the oil seals needed to reseal the lower unit and prevent gear lube from escaping or water from entering the gear case, a common maintenance need any time the lower unit is opened up for service or after a water-intrusion issue is diagnosed. The kit contains two individually numbered oil seals: the 18-2059 oil seal (O.E. 321466) and the 18-2064 oil seal (O.E. 332205), each manufactured to meet or exceed the quality of the original equipment part it replaces.

Using the correct seal kit during a lower unit rebuild helps maintain a proper gear lube seal, which protects the gear case from corrosion and premature wear caused by water contamination. The kit is designed as a direct replacement for the original Johnson/Evinrude part 396349, so it drops into the same lower unit assembly without modification. It is intended for outboard owners and marine technicians performing lower unit reseals, gear case rebuilds, or preventive maintenance on Johnson/Evinrude outboards.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2660
• Product Name: Lower Unit Seal Kit
• Contains: 18-2059 Oil Seal (O.E. 321466), 18-2064 Oil Seal (O.E. 332205)
• Weight: 0.22 pounds
• Color: White
• Shape: Round
• UPC: 030999312716

Fitment

• Johnson/Evinrude outboard motors

Replaces (OEM)

• 396349

Frequently Asked Questions

What does the Sierra 18-2660 Lower Unit Seal Kit include? The kit includes two oil seals: an 18-2059 oil seal (O.E. 321466) and an 18-2064 oil seal (O.E. 332205), both intended for resealing the lower unit gear housing.

What outboard motors does the 18-2660 seal kit fit? This seal kit is designed for Johnson and Evinrude outboard motors that use the 396349 lower unit seal kit.

Is the Sierra 18-2660 a direct replacement for OEM part 396349? Yes, the 18-2660 kit replaces the original Johnson/Evinrude part number 396349 and is built to meet or exceed the quality of the original equipment part.

How much does the 18-2660 seal kit weigh? The Sierra 18-2660 Lower Unit Seal Kit weighs 0.22 pounds.

What color are the seals in the 18-2660 kit? The seals in this kit are white.

When should I install a lower unit seal kit like the 18-2660? A lower unit seal kit such as the 18-2660 should be installed any time the gear housing is opened for service, or when gear lube is found to be contaminated with water, indicating a failed seal.

Are the seals in the 18-2660 kit genuine OEM parts? No, the Sierra 18-2660 is an aftermarket seal kit manufactured to meet or exceed the quality of the original equipment seals it replaces, rather than being sourced from Johnson/Evinrude directly.

What is the shape of the oil seals in the 18-2660 kit? Both oil seals included in the Sierra 18-2660 kit are round in shape.

Does the 18-2660 kit include gaskets or just seals? The 18-2660 kit contains two oil seals, the 18-2059 and 18-2064, and does not list any gaskets as included components.

What is the UPC for the Sierra 18-2660 Lower Unit Seal Kit? The UPC for the Sierra 18-2660 Lower Unit Seal Kit is 030999312716.