OMC Evinrude Johnson Seal Ring

An OMC Evinrude or Johnson seal ring, commonly an O-ring, is a circular, rubber or other elastomer gasket used to prevent leaks in various mechanical components, such as outboard motors. It acts as a seal by squeezing between two surfaces and filling any gaps to prevent fluid or air from escaping.

Here's a more detailed description

Function

O-ring are used in both static and dynamic sealing applications, meaning they can be used where parts are stationary or moving.

Material

OMC Evinrude and Johnson O-rings are typically made from rubber, but other materials like PTFE, Nitrlie, Neoprene, EPDM Rubber, and Fluorocarbon (Vition) may be used.

Shape

O-Rings have a round cross-section and the name "O-ring" comes from the shape resembling the O

Purpose 

They are designed to create a tight seal when squeezed between two surfaces, preventing fluids or air from leaking.

Applications

O-rings are used in various places within outboard motors, such as sealing around impellers, crankshafts, and other components 

Wear

O-Rings can wear out over time due to friction and movement, requiring.