{"product_id":"sierra-18-6011a-outboard-anode-for-honda-bf75-bf90-1997-98-replaces-oem-41107-zw1-003za","title":"Sierra 18-6011A Anode, Replaces 31640, Fits R\/MR\/Alpha One Sterndrive \u0026 Transom Assembly (1983-90) and Alpha One Gen II (1991 \u0026 up)","description":"\u003cp\u003eThe Sierra 18-6011A is a sacrificial anode built for sterndrive and transom assembly applications, protecting underwater metal components from galvanic corrosion caused by electrolysis in fresh and salt water. Mounted on the drive or transom assembly, the anode corrodes preferentially in place of the more expensive surrounding metal parts, extending the service life of the drive unit. Installation is straightforward, making it a routine maintenance item for boat owners performing seasonal upkeep or replacing a worn-out anode.\u003c\/p\u003e\u003cp\u003eThe Sierra 18-6011A is designed for use on R\/MR\/Alpha One, Sterndrive \u0026amp; Transom Assembly (1983-90) \u0026amp; prior drives, and Alpha One, Gen II (1991 \u0026amp; up) applications, and it directly replaces a wide range of OEM anode part numbers, so it is a straightforward drop-in for owners servicing these drive systems. Regular inspection and replacement of the anode helps prevent costly corrosion damage to the sterndrive housing, propeller shaft, and other submerged metal components.\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 18-6011A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Category:\u003c\/strong\u003e Mercury Outboard Anodes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.43 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282175870\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eR\/MR\/Alpha One, Sterndrive \u0026amp; Transom Assembly (1983-90) \u0026amp; prior drives\u003c\/li\u003e\n\u003cli\u003eAlpha One, Gen II (1991 \u0026amp; up)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e31640\u003c\/li\u003e\n\u003cli\u003e31640A1\u003c\/li\u003e\n\u003cli\u003e97-31640Q4\u003c\/li\u003e\n\u003cli\u003e31640T6\u003c\/li\u003e\n\u003cli\u003e97-31640B4\u003c\/li\u003e\n\u003cli\u003e31640A4\u003c\/li\u003e\n\u003cli\u003e31640A2\u003c\/li\u003e\n\u003cli\u003e316404\u003c\/li\u003e\n\u003cli\u003e316403\u003c\/li\u003e\n\u003cli\u003e72436A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-6011A anode fit?\u003c\/strong\u003e The Sierra 18-6011A is designed for use on R\/MR\/Alpha One, Sterndrive \u0026amp; Transom Assembly (1983-90) \u0026amp; prior drives, as well as Alpha One, Gen II (1991 \u0026amp; up) applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-6011A replace?\u003c\/strong\u003e It replaces OEM numbers 31640, 31640A1, 97-31640Q4, 31640T6, 97-31640B4, 31640A4, 31640A2, 316404, 316403, and 72436A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-6011A weigh?\u003c\/strong\u003e This anode weighs 0.43 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the 18-6011A anode?\u003c\/strong\u003e The Sierra 18-6011A measures 0.39 x 0.39 x 0.39 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-6011A the same as Sierra part 18-6011?\u003c\/strong\u003e No, 18-6011A is a distinct, current Sierra part number; it is not interchangeable by number with 18-6011 or 18-6012, which are separate anode part numbers with their own fitment and replaces lists.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does a sterndrive need an anode like the 18-6011A?\u003c\/strong\u003e Sacrificial anodes such as the 18-6011A corrode in place of the drive's metal components, protecting the sterndrive and transom assembly from galvanic corrosion in the water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-6011A fit Alpha One Gen II drives?\u003c\/strong\u003e Yes, the Sierra 18-6011A is listed for use on Alpha One, Gen II (1991 \u0026amp; up) drives, in addition to R\/MR\/Alpha One Sterndrive \u0026amp; Transom Assembly (1983-90) \u0026amp; prior drives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow often should the 18-6011A anode be replaced?\u003c\/strong\u003e The 18-6011A should be inspected regularly and replaced once significantly corroded, since its function is to sacrificially deteriorate in place of the surrounding metal drive components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-6011A a genuine Sierra part?\u003c\/strong\u003e Yes, 18-6011A is a Sierra-branded anode identified by its own manufacturer part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-6011A be used to replace 31640A1?\u003c\/strong\u003e Yes, the Sierra 18-6011A anode replaces OEM number 31640A1 along with several other listed cross-reference numbers.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988348317915,"sku":"SIE-18-6011A","price":14.39,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/186011a__92918.1558128604.500.750.jpg?v=1785188861","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-6011a-outboard-anode-for-honda-bf75-bf90-1997-98-replaces-oem-41107-zw1-003za","provider":"Good Vibes Marina","version":"1.0","type":"link"}