Sierra 18-2654 Lower Unit Seal Kit, Replaces 26-79831A1, for Mercury/Mariner Outboard Motors

The Sierra 18-2654 Lower Unit Seal Kit is a gearcase seal kit built to restore the watertight and oil-tight seal in the lower unit of Mercury and Mariner outboard motors. Lower unit seals wear over time and are a common source of gear lube leaks or water intrusion into the gearcase, both of which can lead to costly gearcase damage if left unaddressed. This kit supplies the key oil seal needed to reseal the lower unit during a rebuild or preventive maintenance service.

The kit is built around a round, white rubber seal component, engineered by Sierra to meet or exceed the fit and performance of the original equipment part it replaces. Sierra manufactures replacement marine parts to the same demands as high-horsepower engines see in the field, and supplies OEM engine manufacturers and boat builders with parts daily, so the 18-2654 kit is built to the same standard buyers expect from an original Mercury/Mariner component.

Kit contents include the part number 18-2008 oil seal (O.E.# 26-56788, qty 1), the core sealing component of this lower unit kit. This kit replaces OEM part number 26-79831A1, so it is a direct fit for outboards originally fitted with that seal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2654
• Category: Mercury Outboard Gearcase Seal Kit
• Material: Rubber
• Color: White
• Shape: Round
• Weight: 0.12 pounds
• UPC: 030999312655
• Kit Contents: 18-2008 Oil Seal (O.E.# 26-56788), Qty 1

Fitment

• Mercury and Mariner outboard motors

Replaces (OEM)

• 26-79831A1

Frequently Asked Questions

What does the Sierra 18-2654 Lower Unit Seal Kit fit? The 18-2654 kit is designed for Mercury and Mariner outboard motors, replacing the OEM lower unit seal on those units.

What OEM part number does the 18-2654 replace? Sierra part 18-2654 replaces OEM part number 26-79831A1.

What is included in the 18-2654 kit? The kit contains one 18-2008 oil seal, which corresponds to O.E. Part number 26-56788, quantity one.

What material is the seal made from? The seal in the Sierra 18-2654 kit is made of rubber, formed in a round shape.

What color is the Sierra 18-2654 seal kit? The 18-2654 lower unit seal is white in color.

How much does the 18-2654 seal kit weigh? The Sierra 18-2654 Lower Unit Seal Kit weighs 0.12 pounds.

Is the Sierra 18-2654 a genuine Mercury part or aftermarket? The 18-2654 is a Sierra-brand aftermarket replacement, engineered to meet or exceed the performance of the original OEM part it replaces (26-79831A1), not a Mercury-branded original part.

When would I need to replace the lower unit seal with kit 18-2654? This kit is used when the lower unit seal on a Mercury or Mariner outboard is worn or leaking, allowing gear lube to escape or water to enter the gearcase.

What is the UPC for the Sierra 18-2654 kit? The UPC for the Sierra 18-2654 Lower Unit Seal Kit is 030999312655.

Does Sierra manufacture this seal kit to OEM engine manufacturer standards? Yes, Sierra supplies parts to OEM engine manufacturers and boat builders, and the 18-2654 kit is built to meet or exceed the original equipment part it replaces.

Can I use the 18-2654 kit for other outboard brands besides Mercury and Mariner? The Sierra 18-2654 Lower Unit Seal Kit is specified for Mercury and Mariner outboard motors.

What is the shape of the seal in kit 18-2654? The oil seal included in the Sierra 18-2654 kit is round in shape.