Sierra 18-7127 O-Ring, Replaces 25-32507, for Johnson/Evinrude, OMC, Chrysler/Force, Suzuki and Mercruiser Engines

The Sierra 18-7127 O-Ring is a rubber sealing o-ring sized at 3.315 inches inside diameter by 0.35 inches width, built to seal against fuel, oil, or water intrusion at the mating surface it is installed on in select marine engines. It is molded from rubber for flexible, durable sealing under the temperature and chemical exposure typical of marine powerhead and drive applications. Each package contains one o-ring, so buyers needing multiples for a full service or rebuild should order accordingly.

This o-ring is designed for use in select Johnson/Evinrude, OMC, Chrysler/Force, Suzuki, and Mercruiser engines. As with any seal replacement, confirm the fit against your specific engine's service specifications before installation, since o-rings of similar size are used across many different engine families and models.

Sierra manufactures this part to meet or exceed the specifications of the original equipment it replaces, making it a reliable choice for maintenance, rebuilds, or repairs where the original o-ring has hardened, cracked, or lost its seal.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7127
• Inside Diameter: 3.315 inches
• Width: 0.35 inches
• Material: Rubber
• Color: Black
• OEM Cross-Reference: 25-32507, F83404
• Weight: 0.02 pounds
• Package Quantity: 1 o-ring

Fitment

• Select Johnson/Evinrude engines
• Select OMC engines
• Select Chrysler/Force engines
• Select Suzuki engines
• Select Mercruiser engines

Replaces (OEM)

• 25-32507
• F83404

Frequently Asked Questions

What size is the Sierra 18-7127 o-ring? The Sierra 18-7127 measures 3.315 inches inside diameter by 0.35 inches in width.

What engines does the 18-7127 o-ring fit? It is designed for use in select Johnson/Evinrude, OMC, Chrysler/Force, Suzuki, and Mercruiser engines. Confirm against your engine's service specifications before ordering since similarly sized o-rings are used across other engine families too.

What OEM part numbers does the Sierra 18-7127 replace? It replaces OEM numbers 25-32507 and F83404.

Is the 18-7127 o-ring made of rubber? Yes, it is a rubber o-ring, giving it the flexibility and chemical resistance needed for marine engine sealing applications.

How many o-rings are included with part 18-7127? Each package includes one Sierra 18-7127 o-ring.

What color is the Sierra 18-7127 o-ring? It is black, the standard color for this rubber o-ring.

How much does the 18-7127 o-ring weigh? The Sierra 18-7127 weighs 0.02 pounds.

Is the Sierra 18-7127 an OEM part or aftermarket replacement? It is an aftermarket replacement manufactured by Sierra to meet or exceed the specifications of the original 25-32507 and F83404 equipment it replaces.

Can I use the 18-7127 o-ring for a general engine rebuild? Yes, this o-ring is commonly used during engine service and rebuild work on the Johnson/Evinrude, OMC, Chrysler/Force, Suzuki, and Mercruiser engines it is designed for, provided the dimensions match your engine's original o-ring.

Does the 18-7127 o-ring require any special tools to install? No special tools are required; it installs like a standard o-ring into the mating groove or bore on the applicable engine component.

Will the 18-7127 o-ring fit engines outside the listed brands? It is designed specifically for select Johnson/Evinrude, OMC, Chrysler/Force, Suzuki, and Mercruiser engines, so fit outside those families should be confirmed against your engine's specifications before purchase.