{"product_id":"seasierra-88397a1-upper-unit-seal-kit-for-mercruiser-alpha-one-gen-2-stern-drive-26-88397a1-18-2644","title":"SeaSierra 88397A1 Upper Unit Seal Kit for Mercruiser Alpha One Gen 2 Stern Drive | 26-88397A1 18-2644","description":"\u003ch2\u003eOverview\u003c\/h2\u003e\u003cp\u003eSeaSierra’s 88397A1 Upper Unit Seal Kit is crafted for Mercruiser Alpha One Gen 2 stern drives, providing a cohesive set of seals for the upper gearcase. This aftermarket kit replaces common OEM references such as 26-88397A1, 88397A1, Mallory 9-74302, GLM 87501, and Sierra 18-2644, offering a ready-to-install solution that supports dependable maintenance routines on the water.\u003c\/p\u003e\n\n\u003ch3\u003eWhat’s included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eO-rings: 25-25439, 25-35027, 25-35984, 25-70937, 25-32546\u003c\/li\u003e\n  \u003cli\u003eOil seals: 26-32080, 26-37259\u003c\/li\u003e\n  \u003cli\u003eSeal: 26-88397\u003c\/li\u003e\n  \u003cli\u003eDrain screw gasket: 12-19183, 12-20260\u003c\/li\u003e\n  \u003cli\u003eSeal ring gasket: 26-45577\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCompatibility and fit\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMercruiser Alpha I Gen II 1991–1995 (0D469859–0F679999)\u003c\/li\u003e\n  \u003cli\u003eMercruiser Alpha I Gen II 1996 and up (0F680000 \u0026amp; Up)\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM references: 26-88397A1, 88397A1, Mallory 9-74302, GLM 87501, Sierra 18-2644\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose SeaSierra\u003c\/h3\u003e\n\u003cp\u003eSeaSierra has a long-standing history in marine engine parts since 1987, blending OEM heritage with aftermarket reliability. This kit is designed to simplify maintenance, minimize downtime, and support steady operation by supplying matched components that work together as a seal system for the upper gearcase. Expect crisp fit, consistent material quality, and a package built to withstand the saltwater environment typical of Mercruiser installations.\u003c\/p\u003e\n\n\u003ch3\u003eReal-life use and benefits\u003c\/h3\u003e\n\u003cp\u003eDuring routine season prep or after a stern drive service, this kit helps recreate a tight, dry seal around the drive shaft. While results can vary by application, the combination of seals and O-rings is intended to help maintain proper lubrication, reduce leaks, and preserve the gearcase’s integrity over time. The set is ideal for boaters who perform regular maintenance, owners who value a complete, vetted replacement, and technicians who appreciate a consolidated kit with OEM-equivalent parts.\u003c\/p\u003e\n\n\u003ch3\u003eUsage tips\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eInspect all mating surfaces for damage before installation.\u003c\/li\u003e\n  \u003cli\u003eReplace all O-rings and seals as a set to promote uniform sealing performance.\u003c\/li\u003e\n  \u003cli\u003eFollow standard torque and lubrication guidelines during reassembly.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eNote: This kit offers a practical upgrade path and maintenance option, but individual results depend on installation accuracy and operating conditions.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Is this kit compatible with Mercruiser Alpha One Gen 2 stern drives?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It is designed for Alpha One Gen 2 (1991–1995 and 1996+ ranges) and replaces OEM references like 26-88397A1 and 18-2644.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: What does the SeaSierra 88397A1 Upper Unit Seal Kit include?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: It includes all O-rings, oil seals, seals, drain gaskets, and the seal ring gasket listed in the product features.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":42468731945045,"sku":"B0DLT19TG5","price":40.26,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0632\/3270\/4597\/files\/seasierra-upper-seal-kit-mercruiser-alpha1-gen2-assembly.jpg?v=1778079946","url":"https:\/\/plentytorque.co.uk\/products\/seasierra-88397a1-upper-unit-seal-kit-for-mercruiser-alpha-one-gen-2-stern-drive-26-88397a1-18-2644","provider":"PlentyTorque","version":"1.0","type":"link"}