Sierra 18-2635 Lower Unit Seal Kit for Mercury Outboard Gearcase, Replaces 26-814669A2

The Sierra 18-2635 Lower Unit Seal Kit is a gearcase seal kit built for Mercury outboard lower units, engineered to meet or exceed the quality of the original equipment part it replaces. This kit is designed as a direct service replacement for worn or leaking lower unit seals, helping keep gear lube contained and water out of the gearcase during operation. As with all Sierra parts, it is manufactured to meet or exceed OEM specifications, giving installers confidence that fit and performance will match or surpass the factory original.

The kit is packaged as a single unit count and is cross-referenced to several legacy OEM and aftermarket part numbers, making it a straightforward match for technicians and boat owners searching by an older Chrysler, GLM, or Mallory reference number as well as the current Mercury number. It is intended for use during routine lower unit maintenance, gearcase rebuilds, or when addressing a lower unit oil leak.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2635
• Product Name: Lower Unit Seal Kit
• Category: Mercury Outboard Gearcase Seal Kit
• Weight: 0.21 pounds
• UPC: 808282234966
• Color: White
• Shape: Round
• Unit Count: 1.0 Count

Fitment

Designed for Mercury outboard gearcase applications.

Replaces (OEM)

• Chrysler 26-814669A2
• Chrysler 26-814669A1
• FK1234
• GLM 87809
• Mallory 9-74204
• Mercury 26-814669A2

Frequently Asked Questions

What is the Sierra 18-2635 Lower Unit Seal Kit used for? It is a seal kit for a Mercury outboard lower unit gearcase, used to reseal the unit and stop gear lube leaks or water intrusion during routine maintenance or a gearcase rebuild.

Is the 18-2635 kit interchangeable with other brands' seal kits? Yes, Sierra part 18-2635 is interchangeable with Chrysler 26-814669A2, Chrysler 26-814669A1, FK1234, GLM 87809, Mallory 9-74204, and Mercury 26-814669A2.

Does the Mercury 26-814669A2 seal kit cross to a Sierra part number? Mercury 26-814669A2 crosses directly to Sierra 18-2635, the Lower Unit Seal Kit covered here.

How much does the 18-2635 seal kit weigh? The Sierra 18-2635 Lower Unit Seal Kit weighs 0.21 pounds.

What color is the 18-2635 seal kit? The seals in Sierra kit 18-2635 are white in color.

How many pieces come in the Sierra 18-2635 kit? Sierra 18-2635 is sold as a 1.0 count unit, packaged as a complete lower unit seal kit.

Is Sierra 18-2635 an OEM or aftermarket part? It is a Sierra aftermarket replacement part manufactured to meet or exceed the original equipment quality of the Mercury lower unit seal it replaces.

What is the UPC for the Sierra 18-2635 seal kit? The UPC for the Sierra 18-2635 Lower Unit Seal Kit is 808282234966.

What shape are the seals in the 18-2635 kit? The seals included in Sierra 18-2635 are round in shape.

Will the 18-2635 kit fit older Chrysler outboard lower units? Since Sierra 18-2635 cross-references to Chrysler 26-814669A2 and 26-814669A1, it fits lower units originally serviced by those Chrysler part numbers.