Sierra 18-2685 Lower Unit Seal Kit (OE 321786, 321787) for Johnson/Evinrude Outboard Motors

The Sierra 18-2685 Lower Unit Seal Kit is a gear housing seal kit built for Johnson/Evinrude outboard motors. It is designed to restore a watertight, oil-tight seal in the lower unit, preventing water intrusion into the gear case and stopping gear lubricant from leaking out, both of which protect the gear set and bearings from corrosion and premature wear. Sierra engineers its seals and gaskets to meet or exceed the specifications of the original equipment parts they replace, so the kit installs and seals the same way as the factory components it is intended to service.

The kit bundles multiple oil seals so a technician can address the lower unit sealing points in a single job rather than sourcing each seal individually. Included are three of the 18-2030 oil seal (OE equivalent 321786) and one 18-2031 oil seal (OE equivalent 321787), along with component 18-4248. Buyers researching parts for their outboard's gear housing can cross-reference this kit directly by its included OE seal numbers.

Sierra 18-2685 is intended for Johnson/Evinrude outboard motors. As with any lower unit seal replacement, seals should be installed with attention to correct orientation and lip lubrication to achieve a proper seal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2685
• Product Category: Lower Unit Seal Kit (Evinrude Outboard Gear Housing Seal Kit)
• Color: White
• Shape: Round
• Weight: 0.13 pounds
• UPC: 030999562845
• Kit Contents: 18-2030 Oil Seal (OE 321786), Qty 3; 18-2031 Oil Seal (OE 321787), Qty 1; component 18-4248
• Fitment: Johnson/Evinrude outboard motors

Fitment

• Johnson/Evinrude outboard motors

Replaces (OEM)

• 321786
• 321787

Frequently Asked Questions

What is the Sierra 18-2685 kit used for? It is a lower unit seal kit that reseals the gear housing on Johnson/Evinrude outboard motors, keeping water out of the gear case and gear lubricant in.

Which outboard motors does the 18-2685 seal kit fit? The Sierra 18-2685 is built for Johnson/Evinrude outboard motors.

What seals come in the Sierra 18-2685 kit? The kit includes three of the 18-2030 oil seal (OE equivalent 321786), one 18-2031 oil seal (OE equivalent 321787), and component 18-4248.

What OEM numbers does the Sierra 18-2685 kit cross-reference to? The oil seals in kit 18-2685 correspond to OEM numbers 321786 and 321787.

How many oil seals are included in the 18-2685 kit? Four oil seals total: three of the 18-2030 (OE 321786) and one 18-2031 (OE 321787), plus the 18-4248 component.

How much does the Sierra 18-2685 seal kit weigh? The kit weighs 0.13 pounds.

What color is the Sierra 18-2685 seal kit? The seals in this kit are white.

Is the Sierra 18-2685 an OEM part or aftermarket? 18-2685 is a Sierra aftermarket kit engineered to meet or exceed the specifications of the original Johnson/Evinrude equipment it replaces.

Does the Sierra 18-2685 kit include gaskets or just seals? This kit is a set of oil seals (18-2030 and 18-2031) plus the 18-4248 component, not a gasket set.

What is the UPC for the Sierra 18-2685 lower unit seal kit? The UPC for the Sierra 18-2685 kit is 030999562845.

Are there aftermarket alternatives to the Sierra 18-2685 kit? Yes, the same seal set is cross-listed as interchangeable with Mallory 9-74115 and GLM 87619.