Sierra O-Ring 18-7130, Replaces OMC 314728, for Johnson/Evinrude and OMC Sterndrive/Cobra Stern Drive

The Sierra 18-7130 is a rubber O-ring built as a direct replacement for select Johnson/Evinrude and OMC Sterndrive/Cobra Stern Drive engines. It measures 2.125 inches (54 mm) inside diameter with a 0.100 inch (2.5 mm) cross-sectional width, and each package contains one O-ring. The ring is molded from black rubber for resistance to marine fuels, oils, and water exposure in sterndrive and outboard applications.

This O-ring is used as a sealing component within the sterndrive/outboard assembly, cross-referencing directly to OMC part number 314728. Sierra manufactures replacement parts that meet or exceed the specifications of the original equipment they replace, making the 18-7130 a straightforward like-for-like swap when the factory O-ring has hardened, cracked, or lost its seal. Before ordering, confirm the 2.125 inch I.D. And 0.100 inch width match the O-ring being replaced on your engine.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7130
• Product Type: O-Ring
• Inside Diameter: 2.125 inches (54 mm)
• Width: 0.100 inches (2.5 mm)
• Material: Rubber
• Color: Black
• Quantity: 1 O-ring per package
• Weight: 0.01 pounds
• UPC: 030999321459
• OEM Cross Reference: 314728

Fitment

Designed for select Johnson/Evinrude and OMC Sterndrive/Cobra Stern Drive engines.

Replaces (OEM)

• 314728

Frequently Asked Questions

What engines does the Sierra 18-7130 O-ring fit? The 18-7130 is designed for select Johnson/Evinrude and OMC Sterndrive/Cobra Stern Drive engines. Confirm the 2.125 inch inside diameter matches your original O-ring before ordering.

What are the exact dimensions of this O-ring? The Sierra 18-7130 measures 2.125 inches (54 mm) inside diameter with a 0.100 inch (2.5 mm) width.

Is the 18-7130 the same as OMC part number 314728? Yes, the Sierra 18-7130 cross-references directly to OMC part number 314728 and is built as a direct replacement for it.

How many O-rings come in one package? Each package of the Sierra 18-7130 contains a single O-ring.

What material is the 18-7130 O-ring made from? It is molded from black rubber, suited to sealing applications exposed to marine fuel, oil, and water.

Is Sierra 18-7130 a genuine OMC part or an aftermarket replacement? The 18-7130 is a Sierra aftermarket replacement, manufactured to meet or exceed the specifications of the original OMC O-ring it replaces.

How do I know if I need to replace this O-ring? A hardened, cracked, or flattened O-ring at this location will lose its seal; if you see oil, fuel, or water seepage at the mating surface, the 18-7130 O-ring should be replaced.

Does the 18-7130 come with installation instructions or a gasket kit? No, the package contains only the O-ring itself, with no gasket kit or instructions included.

How much does the Sierra 18-7130 O-ring weigh? It weighs 0.01 pounds.

Can I use the 18-7130 O-ring in a different location than OMC 314728 if the dimensions match? The 18-7130 is sized at 2.125 inches I.D. By 0.100 inches width; as long as those dimensions match the O-ring being replaced, it can be used, but always verify fit against your original part first.