Sierra 18-6158Z Zinc Anode Kit for Mercruiser Alpha One Gen2 Sterndrives

The Sierra 18-6158Z Zinc Anode Kit is a sacrificial anode set built for Mercruiser Alpha One Gen2 sterndrives, providing galvanic corrosion protection for underwater metal components. Zinc anodes work by corroding in place of the more expensive metal parts on your outdrive, such as the housing, propeller shaft, and trim components, so replacing them on a regular schedule is one of the simplest ways to extend the service life of your sterndrive. This kit ships as a complete set, packaged and ready to install without the need to source individual anodes separately. Because it is designed specifically for the Alpha One Gen2 platform, the anode shapes and mounting points are matched to the fasteners and surfaces already on the outdrive, so no modification or fabrication is required. Zinc anodes are the standard choice for boats operated in saltwater, where they sacrifice themselves to protect surrounding metal from electrolysis and galvanic corrosion. Routine anode inspection and replacement is a core part of sterndrive maintenance, and a worn anode (more than 50 percent consumed) should be replaced promptly to keep the protection system effective. The kit carries the Sierra 18-6158Z part number for easy reordering.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-6158Z
• Product Type: Zinc Anode Kit
• Material: Zinc
• Fitment: Mercruiser Alpha One Gen2
• Item Dimensions: 9 inches L x 5 inches W x 5 inches H
• Weight: 5.83 pounds
• Unit Count: 1 kit
• UPC: 808282277277

Fitment

• Mercruiser Alpha One Gen2 sterndrives

Frequently Asked Questions

What does the Sierra 18-6158Z Anode Kit fit? The Sierra 18-6158Z Zinc Anode Kit is designed for Mercruiser Alpha One Gen2 sterndrives.

What material are the anodes made of? This kit uses zinc anodes, which are the standard sacrificial metal for boats operated in saltwater.

How many anodes come in the kit? The Sierra 18-6158Z ships as a complete kit containing one set of zinc anodes for the Alpha One Gen2 outdrive.

How much does the anode kit weigh? The Sierra 18-6158Z Anode Kit weighs 5.83 pounds.

What are the package dimensions of the kit? The kit measures 9 inches long by 5 inches wide by 5 inches high as packaged.

When should the zinc anodes be replaced? Zinc anodes on a sterndrive should be replaced once they are worn down by about half, and the Sierra 18-6158Z kit provides fresh anodes to restore corrosion protection.

Why does my Mercruiser Alpha One Gen2 need zinc anodes? Zinc anodes sacrifice themselves through galvanic corrosion to protect the more expensive metal components on the Alpha One Gen2 sterndrive, such as the housing and propeller shaft.

Is this kit only for saltwater use? Zinc anodes like those in the 18-6158Z kit are the standard corrosion protection choice for saltwater; freshwater boats typically use a different anode material.

Does the 18-6158Z include mounting hardware? The Sierra 18-6158Z is supplied as an anode kit; check the anode shapes against your existing mounting points on the Alpha One Gen2 outdrive when installing.

Is the Sierra 18-6158Z a genuine Sierra part? Yes, the 18-6158Z is a Sierra branded Zinc Anode Kit, sold under Sierra's own part number.