Sierra 18-8367 Oil Seal, OEM 334950, for Johnson/Evinrude Outboard Engines

The Sierra 18-8367 Oil Seal is a replacement oil seal engineered for use in Johnson/Evinrude outboard engines. It is built to the shaft and bore dimensions required for a correct fit in the applicable Johnson/Evinrude powerhead or lower unit location, sealing against oil loss and keeping water and contaminants out of the housing. The seal measures 1.687 inches outside diameter, 0.250 inches in width, and fits a 1.250 inch shaft. Each unit is sold as a single oil seal (1 pack). As a Sierra part, it is manufactured to meet or exceed the specification of the original equipment part it replaces, making it a straightforward drop-in replacement for the corresponding factory seal. Before ordering, confirm the shaft size and outside diameter against the seal currently installed in your engine to ensure a proper match, since oil seals of similar appearance are often sized differently between engine families and years.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-8367
• OEM Cross Reference: 334950
• Shaft Size: 1.250 inches
• Outside Diameter: 1.687 inches
• Width: 0.250 inches
• Weight: 0.02 pounds
• Package Quantity: 1 oil seal
• UPC: 808282125653

Fitment

• Johnson/Evinrude outboard engines

Replaces (OEM)

• 334950

Frequently Asked Questions

What engines is the Sierra 18-8367 oil seal designed for? It is designed for use in Johnson/Evinrude outboard engines, sealing the shaft location it is fitted to against oil loss and water intrusion.

What size is the Sierra 18-8367 oil seal? It measures 1.687 inches outside diameter, 0.250 inches in width, and fits a 1.250 inch shaft.

Does the 18-8367 cross-reference to an OEM part number? Yes, the Sierra 18-8367 corresponds to OEM part number 334950 on Johnson/Evinrude outboards.

How many seals come in a package of 18-8367? Each package contains one Sierra 18-8367 oil seal.

How much does the 18-8367 oil seal weigh? It weighs 0.02 pounds.

Is the Sierra 18-8367 a genuine Johnson/Evinrude part or aftermarket? The 18-8367 is a Sierra-manufactured aftermarket replacement, made to meet or exceed the specification of the original Johnson/Evinrude 334950 seal it replaces.

How do I know if the 18-8367 will fit my outboard? Confirm the shaft size (1.250 inches) and outside diameter (1.687 inches) of the seal currently in your Johnson/Evinrude engine match the 18-8367 before ordering, since similar-looking seals can differ in size across engine families.

What is included when I order the 18-8367? You receive one Sierra 18-8367 oil seal, sized 1.687 inches O.D. By 0.250 inches width with a 1.250 inch shaft fit.

Can the 18-8367 be used as a general-purpose oil seal, or is it engine-specific? The 18-8367 is manufactured to the dimensions and specification for Johnson/Evinrude outboard engines rather than as a universal seal, so it should be matched to that application.

Is installation of the 18-8367 something I can do myself? The 18-8367 is a standard press-fit oil seal sized to the Johnson/Evinrude shaft location it replaces; installation follows the same procedure as replacing the original 334950 seal in that engine.