Sierra Oil Seal 18-2002, Replaces Honda 91252-ZW1-003, Mercury Marine 26-76868, OMC 320862

The Sierra 18-2002 is a small oil seal engineered for outboard prop and driveshaft applications where a compact, precise seal is needed to keep gear lube in and water out. It is a round-profile seal sized for a 1.692 inch (43 mm) outer diameter and a 1.188 inch (30.2 mm) shaft, with a 0.250 inch (6.4 mm) width, making it a direct fit wherever those exact dimensions are called for. Sierra lists this seal as a universal fit part, meaning it is sized to the seal cavity itself rather than to one specific engine model, so it can be used across outboard and drive applications that share this bore, shaft, and width combination.

Construction is a standard round oil seal design intended to hold up to marine gear-case conditions and repeated duty cycles. It ships as a single seal (one count) ready to install during a lower-unit or driveshaft service, and it cross-references directly to Honda, Mercury Marine, and OMC part numbers, so it is a straightforward replacement when servicing engines built around those OEM seals.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-2002
• Product Name: Oil Seal
• Category: Evinrude Outboard Prop & Driveshaft Seals
• Shape: Round
• Outer Diameter: 1.692 inches (43 mm)
• Shaft Size: 1.188 inches (30.2 mm)
• Width: 0.250 inches (6.4 mm)
• Fit Type: Universal fit
• Weight: 0.03 pounds
• Unit Count: 1 seal
• UPC: 030999309488

Fitment

Universal fit sized to the 1.692 inch outer diameter, 1.188 inch shaft, and 0.250 inch width seal cavity; not restricted to a single engine model.

Replaces (OEM)

• Honda 91252-ZW1-003
• Mercury Marine 26-76868
• OMC 320862

Frequently Asked Questions

What is the Sierra 18-2002 oil seal used for? The Sierra 18-2002 is a small oil seal used in outboard prop and driveshaft applications to keep gear lube contained and water out of the lower unit.

Will the 18-2002 fit my outboard? It is a universal fit seal sized to a 1.692 inch outer diameter, 1.188 inch shaft, and 0.250 inch width, so the 18-2002 fits any application that uses that exact seal cavity size rather than being limited to one engine model.

Does the Sierra 18-2002 replace a Honda oil seal? Yes, the Sierra 18-2002 cross-references directly to Honda part number 91252-ZW1-003.

Is the 18-2002 the same as Mercury Marine 26-76868? Yes, Mercury Marine 26-76868 is one of the OEM numbers the Sierra 18-2002 oil seal cross-references to.

Does this seal cross to an OMC part number? Yes, OMC 320862 is listed as an equivalent to the Sierra 18-2002 oil seal.

What are the dimensions of the 18-2002 oil seal? The seal measures 1.692 inches (43 mm) outer diameter, 1.188 inches (30.2 mm) shaft size, and 0.250 inches (6.4 mm) in width.

How much does the 18-2002 oil seal weigh? The Sierra 18-2002 oil seal weighs 0.03 pounds.

What shape is the Sierra 18-2002 seal? It is a round oil seal, as listed under the 18-2002 part number.

How many seals come in one order of 18-2002? Each order of the Sierra 18-2002 includes one oil seal (unit count of 1).

Is the Sierra 18-2002 an OEM or aftermarket part? The 18-2002 is a Sierra-branded replacement seal that cross-references to OEM Honda, Mercury Marine, and OMC part numbers, making it a direct aftermarket equivalent rather than an OEM-branded part.

What category of part is the 18-2002? The Sierra 18-2002 is categorized as an outboard prop and driveshaft seal.