{"product_id":"upper-unit-seal-kit-for-mercruiser-alpha-one-gen-ii-stern-drive-1991-up-replaces-26-88397a1","title":"Sierra Upper Unit Seal Kit 18-2644 - Replaces 26-88397A1 - Mercruiser Alpha I Generation II Stern Drive","description":"\u003cp\u003eThe Sierra 18-2644 Upper Unit Seal Kit supplies the seals and gaskets needed to properly rebuild the upper gear housing on a Mercruiser Alpha I Generation II stern drive. This kit replaces OEM number 26-88397A1 and is engineered to meet or exceed the specifications of the original equipment part it replaces. Sierra supplies many OEM engine manufacturers and boat builders with quality marine parts, and this seal kit is built to stand up to the harsh marine environment while sealing the upper unit against water intrusion and lubricant loss.\u003c\/p\u003e\u003cp\u003eThe kit contains a Seal Gasket (Sierra 18-2944, OE 26-45577-1) and a Drain Screw Gasket (Sierra 18-2945, OE 12-19183-3), each supplied in a quantity of 1, giving the installer the correct sealing components for an upper unit service or rebuild in one package. Using a complete seal kit at rebuild time helps prevent water intrusion into the gear housing and lubricant leaks that can lead to premature gear and bearing wear.\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 18-2644\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Upper Unit Seal Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999875211\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Seal Gasket (18-2944, OE 26-45577-1), qty 1; Drain Screw Gasket (18-2945, OE 12-19183-3), qty 1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercruiser Alpha I Generation II stern drive\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-88397A1\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2644 Upper Unit Seal Kit fit?\u003c\/strong\u003e The 18-2644 kit is designed for the Mercruiser Alpha I Generation II stern drive upper gear housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does 18-2644 replace?\u003c\/strong\u003e Sierra 18-2644 replaces OEM number 26-88397A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included in the 18-2644 seal kit?\u003c\/strong\u003e The kit includes a Seal Gasket (Sierra 18-2944, OE 26-45577-1) and a Drain Screw Gasket (Sierra 18-2945, OE 12-19183-3), one of each.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2644 seal kit weigh?\u003c\/strong\u003e The Sierra 18-2644 Upper Unit Seal Kit weighs 0.14 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-2644 kit genuine OEM or aftermarket?\u003c\/strong\u003e It is a Sierra aftermarket replacement kit engineered to meet or exceed the specifications of the original 26-88397A1 equipment it replaces, not a Mercruiser branded OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the upper unit seal kit on my stern drive?\u003c\/strong\u003e The 18-2644 kit is intended for use during a rebuild or service of the Alpha I Generation II upper gear housing, whenever the existing seals and gaskets are removed or show signs of wear or leakage.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-2644 kit's gasket material?\u003c\/strong\u003e The gasket material included in the 18-2644 kit is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2644 kit include a drain screw gasket?\u003c\/strong\u003e Yes, the kit includes Sierra 18-2945, a drain screw gasket with OE reference 12-19183-3, in a quantity of one.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat shape is the seal gasket in the 18-2644 kit?\u003c\/strong\u003e The seal gasket included in the Sierra 18-2644 kit is round in shape.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-2644 kit on a different stern drive model?\u003c\/strong\u003e The 18-2644 kit is specified for the Mercruiser Alpha I Generation II upper unit; fitment to other stern drive models is not listed for this part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988108259547,"sku":"SIE-18-2644","price":36.24,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-2644_lg__34869.1558124107.500.750.jpg?v=1785188029","url":"https:\/\/www.goodvibesmarina.com\/products\/upper-unit-seal-kit-for-mercruiser-alpha-one-gen-ii-stern-drive-1991-up-replaces-26-88397a1","provider":"Good Vibes Marina","version":"1.0","type":"link"}