Sierra 18-7108-9 O-Ring, Pack of 5, Replaces Johnson/Evinrude 313893, 338518

The Sierra 18-7108-9 O-Ring is a rubber sealing ring designed for use in Johnson and Evinrude outboard applications, sold in a pack of 5. Each O-ring measures 2.550 inches (64.8mm) in inside diameter with a cross-section width of 0.100 inches (2.5mm), providing a reliable seal against fuel, oil, and water intrusion in outboard powerhead and lower-unit assemblies. The O-ring is molded from black rubber for durability and resistance to the marine environment. Sierra manufactures this O-ring to meet or exceed the specifications of the original equipment part it replaces, making it a direct fit for applications originally fitted with Johnson/Evinrude, GLM, Mallory, or OMC Stern Drive O-rings sharing the same cross-references. Selling multiples in a single pack lets technicians keep spares on hand for routine maintenance or full engine rebuilds, since O-rings are a wear item that should be replaced any time a sealed joint is opened. This is a genuine Sierra part, not a generic aftermarket substitute, and carries the Sierra International brand name.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7108-9
• Material: Rubber
• Color: Black
• Inside Diameter: 2.550 inches (64.8 millimeters)
• Width: 0.100 inches (2.5 millimeters)
• Package Quantity: Pack of 5
• Weight: 0.03 pounds
• UPC: 808282165093

Fitment

• Johnson outboard applications
• Evinrude outboard applications

Replaces (OEM)

• GLM 81450
• Johnson/Evinrude Outboard 313893
• Johnson/Evinrude Outboard 338518
• Mallory 9-76522
• OMC Stern Drive 313893

Frequently Asked Questions

What engines does the Sierra 18-7108-9 O-Ring fit? The Sierra 18-7108-9 O-Ring is designed for use in Johnson and Evinrude outboard applications.

How many O-rings come in a pack? Each pack of the Sierra 18-7108-9 contains 5 O-rings.

What is the inside diameter of this O-ring? The inside diameter of the Sierra 18-7108-9 O-Ring is 2.550 inches, or 64.8mm.

What is the cross-section width of the 18-7108-9 O-ring? The Sierra 18-7108-9 O-Ring has a width of 0.100 inches, or 2.5mm.

What material is the Sierra 18-7108-9 O-Ring made from? It is made from black rubber, suited to sealing against fuel, oil, and water in outboard applications.

Which OEM part numbers does the Sierra 18-7108-9 replace? The Sierra 18-7108-9 is interchangeable with GLM 81450, Johnson/Evinrude Outboard 313893, Johnson/Evinrude Outboard 338518, Mallory 9-76522, and OMC Stern Drive 313893.

Is the Sierra 18-7108-9 O-Ring genuine or aftermarket? It is a Sierra-branded replacement part manufactured to meet or exceed the original equipment part it replaces.

How much does the Sierra 18-7108-9 O-Ring weigh? The pack weighs 0.03 pounds.

What color is the 18-7108-9 O-ring? The Sierra 18-7108-9 O-Ring is black.

When should I replace an O-ring like the 18-7108-9? O-rings are a wear item, so the Sierra 18-7108-9 should be replaced any time the sealed joint it seals is opened during service or a rebuild, which is why it is sold in a pack of 5 for keeping spares on hand.

What is the UPC for the Sierra 18-7108-9 O-Ring? The UPC for the Sierra 18-7108-9 O-Ring is 808282165093.