Sierra O-Ring 18-7120, Replaces 25-F498618, Chrysler/Force Outboard Drive Systems

The Sierra 18-7120 is an O-ring engineered for Chrysler/Force outboard drive systems, sized to seal precisely at the drive component it is fitted to. It carries an inside diameter of 0.215 inch and a width of 0.065 inch, dimensions that match the original equipment seal it replaces. This O-ring is used within the drive system O-ring and oil seal group for Chrysler/Force outboards, where a tight, reliable seal is needed to keep water out and lubricant in around drive-train components.

As a replacement part, the Sierra 18-7120 is intended to restore a factory-correct seal when servicing the drive system, helping prevent water intrusion or lubricant leakage that can lead to corrosion or component wear. Its compact size makes it a low-cost, easy-to-stock component for routine maintenance and drive system rebuilds.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-7120
• Inside Diameter: 0.215 inch
• Width: 0.065 inch
• Weight: 0.01 pounds
• Category: Outboard Drive Systems O-Ring

Fitment

• Chrysler/Force outboard drive systems

Replaces (OEM)

• 25-F498618

Frequently Asked Questions

What does the Sierra 18-7120 O-ring fit? The Sierra 18-7120 O-ring is designed for Chrysler/Force outboard drive systems, where it seals a drive component to keep water out and lubricant in.

What is the OEM equivalent for part 18-7120? Part 18-7120 replaces OEM number 25-F498618, so it is a direct substitute for that original equipment seal.

What size is the 18-7120 O-ring? It measures 0.215 inch inside diameter by 0.065 inch in width.

How much does the 18-7120 O-ring weigh? The Sierra 18-7120 weighs 0.01 pounds.

Is the Sierra 18-7120 a genuine Sierra part or aftermarket? The 18-7120 is a Sierra-branded replacement part manufactured to match the original equipment O-ring it replaces, part number 25-F498618.

Where in the outboard is this O-ring used? This O-ring is part of the drive system O-ring and oil seal group used in Chrysler/Force outboards.

What is included when I order the 18-7120? Ordering the Sierra 18-7120 gets you the single replacement O-ring sized 0.215 inch ID by 0.065 inch width.

Why replace this O-ring during service? A worn or hardened O-ring in the drive system can allow water intrusion or lubricant leakage, so replacing the 18-7120 during service helps maintain a proper seal in Chrysler/Force outboard drive systems.

Does the 18-7120 cross-reference to more than one OEM number? The Sierra 18-7120 cross-references to OEM number 25-F498618.

Is the 18-7120 O-ring specific to certain outboard brands? Yes, the 18-7120 is designated for Chrysler/Force outboard drive systems.