Sierra 18-6158A Aluminum Anode Kit for Alpha One Gen II Drives

The Sierra 18-6158A is an aluminum anode kit built for Alpha One Gen II sterndrives, providing sacrificial corrosion protection for the drive unit in saltwater and brackish-water use. Aluminum anodes are engineered to corrode preferentially to the more expensive metal components of the drive, protecting the housing, gimbal ring, and related hardware from galvanic corrosion caused by stray electrical current and dissimilar-metal contact in the water. Replacing anodes on a regular inspection schedule is one of the simplest ways to prevent costly corrosion damage to a sterndrive.

This kit is manufactured by Sierra, a supplier of engine and drive components engineered to meet or exceed the original equipment parts they replace. Each anode in the kit is made from aluminum, a common choice for boats that operate in saltwater or brackish water where a more active sacrificial metal is needed to protect the drive.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6158A
• Product Type: Anode Kit
• Material: Aluminum
• Color: White
• Item Dimensions: 0.39 x 0.39 x 0.39 inches
• Weight: 2.56 pounds
• UPC: 808282277253
• Fitment: Alpha One Gen II

Fitment

• Alpha One Gen II sterndrives

Frequently Asked Questions

What drive does the Sierra 18-6158A anode kit fit? The Sierra 18-6158A aluminum anode kit is designed for Alpha One Gen II sterndrives.

What material are the anodes made from? The 18-6158A kit is made from aluminum, which is commonly used for anodes that need active sacrificial protection in saltwater or brackish water.

What color is the 18-6158A anode kit? This kit is white in color.

How much does the 18-6158A anode kit weigh? The Sierra 18-6158A anode kit weighs 2.56 pounds.

What are the dimensions of the anodes in this kit? Each anode in the 18-6158A kit measures 0.39 x 0.39 x 0.39 inches.

Does this kit include any OEM cross-reference numbers? No OEM cross-reference or replacement numbers are listed for the Sierra 18-6158A; it is identified solely by its Sierra part number.

Why use aluminum anodes instead of zinc? Aluminum anodes, like those in the 18-6158A kit, are typically chosen for boats operating in saltwater or brackish water because aluminum corrodes more readily than zinc in those conditions, offering more active protection for the Alpha One Gen II drive.

How often should the anodes in this kit be replaced? Anodes such as the Sierra 18-6158A should be inspected regularly and replaced once significantly corroded, since a depleted anode can no longer protect the Alpha One Gen II drive from galvanic corrosion.

Is the Sierra 18-6158A a genuine Sierra part? Yes, the 18-6158A anode kit is manufactured by Sierra and is backed by Sierra's standard customer satisfaction warranty.

What is included in the 18-6158A kit? The Sierra 18-6158A is sold as a complete anode kit for the Alpha One Gen II drive, containing the aluminum anodes needed for a replacement.