Sierra Lower Unit Seal Kit 18-2679, Replaces 303345 and 327031

The Sierra 18-2679 Lower Unit Seal Kit is a two-piece oil seal set for the lower unit gear housing on Evinrude outboard motors. The kit bundles two oil seals so both sealing points in the gear housing are replaced together during a single service job, helping prevent gear lube leaks and water intrusion that can lead to costly gear housing damage.

Each seal in this kit corresponds to a specific position in the gear housing: one seal (Sierra 18-2022) replaces the original equipment 303345 seal, and the second seal (Sierra 18-2035) replaces the original equipment 327031 seal. Sourcing both seals as a matched kit under a single Sierra part number simplifies ordering for a complete lower unit reseal rather than tracking down each seal individually.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2679
• Product Name: Lower Unit Seal Kit
• Kit Contents: 2 oil seals (Sierra 18-2022 and Sierra 18-2035)
• Category: Evinrude Outboard Gear Housing Seal Kits
• Weight: 0.1 pounds
• UPC: 030999562784

Fitment

Designed for Evinrude outboard gear housings using the 303345 and 327031 original equipment oil seals.

Replaces (OEM)

• 303345
• 327031

Frequently Asked Questions

What does the Sierra 18-2679 Lower Unit Seal Kit include? The kit includes two oil seals: Sierra part 18-2022, which replaces original equipment number 303345, and Sierra part 18-2035, which replaces original equipment number 327031.

Is 18-2679 a direct replacement for OEM seals 303345 and 327031? Yes, the Sierra 18-2679 kit is built to replace original equipment oil seals 303345 and 327031 in the gear housing lower unit.

How much does the Sierra 18-2679 seal kit weigh? The Sierra 18-2679 Lower Unit Seal Kit weighs 0.1 pounds.

What category of outboard does this seal kit belong to? The 18-2679 kit is listed under Evinrude Outboard Gear Housing Seal Kits.

How many seals come in the 18-2679 kit? Two oil seals are included in the 18-2679 kit, one qty each of 18-2022 and 18-2035.

Can the individual seals in kit 18-2679 be purchased separately? The two seals that make up the 18-2679 kit have their own Sierra part numbers, 18-2022 and 18-2035, though this listing is for the combined two-seal kit.

What is the UPC for the Sierra Lower Unit Seal Kit 18-2679? The UPC for the Sierra 18-2679 Lower Unit Seal Kit is 030999562784.

Why would I replace both seals at once with kit 18-2679 instead of one at a time? Replacing both gear housing oil seals together with the 18-2679 kit addresses both sealing points in the same service, reducing the chance of a leak developing at the seal left untouched.

Does the 18-2679 kit include gaskets or just seals? The 18-2679 kit contains oil seals only, specifically the two seals corresponding to OEM numbers 303345 and 327031.

What OEM numbers cross-reference to the Sierra 18-2679 kit? The Sierra 18-2679 Lower Unit Seal Kit cross-references to OEM numbers 303345 and 327031.