{"product_id":"sierra-18-2599-face-seal-and-tool-replaces-mercruiser-26-816575a2-fits-alpha-one-gen-ii-drives","title":"Sierra 18-2599 Face Seal and Tool, Fits Alpha One Gen II Drives, Replaces 26-816575A2","description":"\u003cp\u003eThe Sierra 18-2599 Face Seal and Tool is a drive seal designed for Alpha One Gen II sterndrives, supplied as a face seal along with the installation tool needed to seat it correctly. The face seal is a wear item inside the drive housing that maintains the seal between rotating and stationary components, and using the correct tool during installation helps the seal seat evenly and prevents damage that can occur when it is pressed in without one. The seal is molded from nitrile rubber or Viton, materials chosen for their resistance to marine lubricants, water intrusion, and the heat generated at the drive interface. Sierra manufactures this seal and tool to meet or exceed the specification of the original equipment part it replaces, and it is built to be interchangeable with the corresponding OEM and aftermarket part numbers used across Alpha One Gen II applications. The package includes one face seal and one tool, so no separate tool purchase is needed to complete the installation. This part is commonly replaced during drive seal service, prop shaft bearing carrier rebuilds, or general Alpha One Gen II maintenance where the face seal has begun to leak or show wear. Sierra backs this product with its standard customer satisfaction warranty.\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 18-2599\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Face Seal and Tool\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Nitrile rubber or Viton\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999875105\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Alpha One Gen II drives\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-816575A2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eAlpha One Gen II drives\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-816575A2\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2599 fit?\u003c\/strong\u003e The Sierra 18-2599 Face Seal and Tool is designed for Alpha One Gen II sterndrives.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2599 the same as OEM part 26-816575A2?\u003c\/strong\u003e Yes, the Sierra 18-2599 is designed to be interchangeable with Mercruiser\/Mercury OEM part 26-816575A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this part cross-reference to any other brands?\u003c\/strong\u003e Sierra 18-2599 is designed to be interchangeable with GLM 85590 and Mallory 9-3628, in addition to Mercruiser\/Mercury 26-816575A2.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the package?\u003c\/strong\u003e One count of the face seal and one installation tool ship together in the Sierra 18-2599 package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the face seal made of?\u003c\/strong\u003e The Sierra 18-2599 face seal is molded from nitrile rubber or Viton, materials chosen for resistance to marine lubricants and water.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need a special tool to install this seal?\u003c\/strong\u003e No separate tool purchase is needed; the Sierra 18-2599 package already includes the tool required to seat the face seal correctly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-2599 weigh?\u003c\/strong\u003e The Sierra 18-2599 Face Seal and Tool weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-2599 a genuine Sierra part or a generic aftermarket seal?\u003c\/strong\u003e It is a genuine Sierra-manufactured part, produced to meet or exceed the specification of the original equipment seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is a face seal used for on a sterndrive?\u003c\/strong\u003e A face seal, like the Sierra 18-2599, seals the interface inside the Alpha One Gen II drive housing to keep water out and lubricant in around the rotating shaft.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2599 covered under warranty?\u003c\/strong\u003e Yes, the Sierra 18-2599 Face Seal and Tool is covered under Sierra's customer satisfaction warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988107342043,"sku":"SIE-18-2599","price":6.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2599_lg__79055.1558124792.500.750.jpg?v=1785188039","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2599-face-seal-and-tool-replaces-mercruiser-26-816575a2-fits-alpha-one-gen-ii-drives","provider":"Good Vibes Marina","version":"1.0","type":"link"}