{"product_id":"seasierra-mercruiser-alpha-one-gen-ii-upper-unit-seal-kit-88397a1-complete-seals-gaskets","title":"SeaSierra Mercruiser Alpha One Gen II Upper Unit Seal Kit 88397A1 — Complete seals \u0026 gaskets","description":"\u003cp\u003e\u003cstrong\u003eSeaSierra 88397A1 Upper Unit Seal Kit is a complete replacement seal set engineered to restore watertight integrity in Mercruiser Alpha One Gen II upper units.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis upper unit seal kit from SeaSierra contains the assortment of oil seals, O-rings, gaskets, and drain screw gasket you need to service Mercruiser Alpha I Gen II stern drives (model years listed). The kit matches common OEM part numbers and is intended for routine maintenance or repair where worn seals are allowing fluid loss or water ingress.\u003c\/p\u003e\n\n\u003ch3\u003eWhich Mercruiser models and years does this kit fit?\u003c\/h3\u003e\n\u003cp\u003eThe SeaSierra 88397A1 kit is made for Mercruiser Alpha One Gen II stern drives across specified serial ranges and later models. It covers early 1991–1995 units within the given serial blocks and all 1996 and newer units beginning at the indicated serial number.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with Mercruiser Alpha I Gen II 1991–1995 (0D469859 - 0F679999).\u003c\/li\u003e\n  \u003cli\u003eCompatible with 1996 \u0026amp; Up (0F680000 \u0026amp; Up).\u003c\/li\u003e\n  \u003cli\u003eReplaces OEM 26-88397A1 and equivalent aftermarket numbers.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat parts are included in this upper unit seal kit?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains multiple seals and gaskets to service the upper unit without sourcing individual parts. SeaSierra bundles the exact sizes typically replaced during an upper unit overhaul so you can complete the job faster.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOil seals: 26-32080 and 26-37259 for shaft sealing.\u003c\/li\u003e\n  \u003cli\u003eSeals and O-rings: 26-88397, 25-25439, 25-35027, 25-35984, 25-70937, 25-32546.\u003c\/li\u003e\n  \u003cli\u003eGaskets: drain screw gasket 12-19183 (12-20260) and seal ring gasket 26-45577.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this kit compare to OEM and other aftermarket options?\u003c\/h3\u003e\n\u003cp\u003eSeaSierra lists cross-reference numbers to mirror OEM fit and function while offering aftermarket value. The kit replaces known original part numbers and is supplied by a manufacturer experienced in marine engine parts since 1987.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDirect replacement for OEM 26-88397A1 and compatible with Mallory, GLM, Sierra equivalents.\u003c\/li\u003e\n  \u003cli\u003eDesigned for straightforward installation using the same sealing points as the original parts.\u003c\/li\u003e\n  \u003cli\u003eQuality control informed by decades servicing outboard and stern drive components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: This SeaSierra upper unit seal kit is aimed at boat owners, marine mechanics, and DIY enthusiasts working on Mercruiser Alpha One Gen II stern drives who need a full set of upper-unit seals and gaskets for service or repair. If you are replacing leaking seals, preparing a drive for winter storage, or performing preventative maintenance, this kit provides the matched components to get the upper unit reassembled correctly.\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: Does this kit replace the original 26-88397A1?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The SeaSierra 88397A1 kit is a direct replacement for OEM 26-88397A1 and listed aftermarket equivalents.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Will this fit my Alpha One Gen II from 1994?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: If your 1994 unit falls within serial range 0D469859 - 0F679999, this kit is compatible.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"SeaSierra","offers":[{"title":"Default Title","offer_id":67590700040377,"sku":"B0DLT19TG5","price":74.01,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0822\/3765\/3177\/files\/seasierra-kit-front-packaging.jpg?v=1790535974","url":"https:\/\/redleafauto.ca\/products\/seasierra-mercruiser-alpha-one-gen-ii-upper-unit-seal-kit-88397a1-complete-seals-gaskets","provider":"Redleaf Auto","version":"1.0","type":"link"}