{"product_id":"sierra-18-6158z-zinc-anode-kit-for-mercruiser-alpha-one-gen-ii-1991-newer-replaces-888756q01-888755q01","title":"Sierra 18-6158Z Zinc Anode Kit for Mercruiser Alpha One Gen2 Sterndrives","description":"\u003cp\u003eThe 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.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-6158Z\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Zinc Anode Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Zinc\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercruiser Alpha One Gen2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 9 inches L x 5 inches W x 5 inches H\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 5.83 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282277277\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser Alpha One Gen2 sterndrives\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-6158Z Anode Kit fit?\u003c\/strong\u003e The Sierra 18-6158Z Zinc Anode Kit is designed for Mercruiser Alpha One Gen2 sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material are the anodes made of?\u003c\/strong\u003e This kit uses zinc anodes, which are the standard sacrificial metal for boats operated in saltwater.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many anodes come in the kit?\u003c\/strong\u003e The Sierra 18-6158Z ships as a complete kit containing one set of zinc anodes for the Alpha One Gen2 outdrive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the anode kit weigh?\u003c\/strong\u003e The Sierra 18-6158Z Anode Kit weighs 5.83 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the kit?\u003c\/strong\u003e The kit measures 9 inches long by 5 inches wide by 5 inches high as packaged.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the zinc anodes be replaced?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does my Mercruiser Alpha One Gen2 need zinc anodes?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this kit only for saltwater use?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-6158Z include mounting hardware?\u003c\/strong\u003e 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.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6158Z a genuine Sierra part?\u003c\/strong\u003e Yes, the 18-6158Z is a Sierra branded Zinc Anode Kit, sold under Sierra's own part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988353921243,"sku":"SIE-18-6158Z","price":90.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/sie-18-6158z_lg_1__55474.1598557080.500.750.jpg?v=1785188653","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-6158z-zinc-anode-kit-for-mercruiser-alpha-one-gen-ii-1991-newer-replaces-888756q01-888755q01","provider":"Good Vibes Marina","version":"1.0","type":"link"}