{"product_id":"30-803097t1-mercruiser-alpha-one-gen-1-transom-seal-kit","title":"30-803097T1 Transom Seal Kit for MerCruiser Alpha One Gen I | JLM Marine","description":"\n\u003cstyle\u003e\n  .jlm-product-content {\n    color: #333;\n    line-height: 1.7;\n    max-width: 100%;\n  }\n  .jlm-product-content h2 {\n    font-size: 1.4rem;\n    margin-top: 2rem;\n    margin-bottom: 1rem;\n    padding-bottom: 0.5rem;\n    border-bottom: 2px solid #e9ecef;\n    color: #1a1a1a;\n  }\n  .jlm-product-content h3 {\n    font-size: 1.15rem;\n    margin-top: 1rem;\n    margin-bottom: 0.75rem;\n    color: #1a1a1a;\n  }\n  .jlm-product-content p {\n    margin-bottom: 1rem;\n  }\n  .jlm-product-content ul {\n    margin-bottom: 1rem;\n    padding-left: 1.5rem;\n  }\n  .jlm-product-content li {\n    margin-bottom: 0.4rem;\n  }\n  .jlm-note {\n    border-left: 4px solid #0056b3;\n    background-color: #f0f6ff;\n    padding: 1rem 1.25rem;\n    margin-bottom: 1.5rem;\n    border-radius: 0 6px 6px 0;\n  }\n  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}\n  .jlm-table-wrap th {\n    background-color: #f8f9fa;\n    font-weight: 600;\n  }\n  .jlm-table-wrap tr:last-child td {\n    border-bottom: none;\n  }\n  .jlm-faq {\n    margin-bottom: 1.5rem;\n  }\n  .jlm-faq-item {\n    border: 1px solid #e9ecef;\n    border-radius: 8px;\n    padding: 1rem 1.25rem;\n    margin-bottom: 0.75rem;\n    background-color: #fafbfc;\n  }\n  .jlm-faq-item h3 {\n    margin-top: 0;\n    margin-bottom: 0.5rem;\n    color: #0056b3;\n    border-bottom: none;\n    padding-bottom: 0;\n  }\n  .jlm-faq-item p {\n    margin-bottom: 0;\n  }\n  .jlm-brand-trust {\n    border: 1px solid #e0e0e0;\n    background-color: #f8f9fa;\n    border-radius: 8px;\n    padding: 1.5rem;\n    margin-bottom: 2rem;\n  }\n  .jlm-brand-trust ul {\n    margin-bottom: 0;\n    list-style-type: none;\n    padding-left: 0;\n  }\n  .jlm-brand-trust li {\n    position: relative;\n    padding-left: 1.5rem;\n    margin-bottom: 0.75rem;\n  }\n  .jlm-brand-trust li::before {\n    content: \"\\2713\";\n    position: absolute;\n    left: 0;\n    color: #28a745;\n    font-weight: bold;\n  }\n  .jlm-brand-trust li:last-child {\n    margin-bottom: 0;\n  }\n  .jlm-disclaimer {\n    border-top: 1px solid #e9ecef;\n    padding-top: 1rem;\n    margin-top: 2rem;\n    font-size: 0.875rem;\n    color: #666;\n    font-style: italic;\n  }\n  @media (max-width: 768px) {\n    .jlm-grid {\n      grid-template-columns: 1fr;\n    }\n    .jlm-product-content h2 {\n      font-size: 1.25rem;\n    }\n  }\n\u003c\/style\u003e\n\n\u003cdiv class=\"jlm-product-content\"\u003e\n\n  \u003c!-- ═══════════════════════════════════════════════════════════════════\n       LAYER 1: FAST IDENTIFICATION ZONE (Above the Fold — 3-Second Decision)\n       ═══════════════════════════════════════════════════════════════════ --\u003e\n\n  \u003ch2\u003ePart Number Cross-Reference\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMercury \/ MerCruiser OEM:\u003c\/strong\u003e 30-803097T1, 30-803097A2, 30803097T1, 803097T1\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSierra Marine:\u003c\/strong\u003e 18-2601, 18-2601-1, 18-8213\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGLM:\u003c\/strong\u003e 21950\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eSEI Marine:\u003c\/strong\u003e 9A-108\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMallory Marine:\u003c\/strong\u003e 9-72902, 9-72904\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eEngineered Marine Products (EMP):\u003c\/strong\u003e 61-08397\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro Marine:\u003c\/strong\u003e 68397\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eOBR Red Rhino:\u003c\/strong\u003e MR-902\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eWSM:\u003c\/strong\u003e 576-210\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cdiv class=\"jlm-warning\"\u003e\n    \u003ch3\u003eImportant Fitment Exclusions\u003c\/h3\u003e\n    \u003cul\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDoes NOT fit\u003c\/strong\u003e MerCruiser Alpha One Gen II drives (1991 and newer, serial numbers 0D469859 and up). Gen II drives require kit \u003cstrong\u003e30-803099T1\u003c\/strong\u003e.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDoes NOT fit\u003c\/strong\u003e Bravo drives (I, II, III) or Blackhawk drives.\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDoes NOT fit\u003c\/strong\u003e units configured with an exhaust tube instead of exhaust bellows (different kit required).\u003c\/li\u003e\n      \u003cli\u003e\n\u003cstrong\u003eDoes NOT fit\u003c\/strong\u003e older models prior to 1983 (serial numbers below 6225577).\u003c\/li\u003e\n    \u003c\/ul\u003e\n    \u003cp style=\"margin-bottom:0;\"\u003e\u003cem\u003eTip: If your drive has a plastic U-joint shaft cover, if the upper and lower housings are fastened together with through bolts rather than studs, or if the trim cylinders are mounted with C-clips instead of nuts, it is likely a Gen II — this kit will not fit. Gen II drives are also physically larger with a different shift shaft and larger water pump.\u003c\/em\u003e\u003c\/p\u003e\n  \u003c\/div\u003e\n\n  \u003cdiv class=\"jlm-note\"\u003e\n    \u003cstrong\u003eQuick Fitment Check:\u003c\/strong\u003e This complete transom seal kit is commonly listed for MerCruiser R, MR, Alpha One Gen I, and Alpha One SS sterndrives (approx. 1983–1990, serial number 6225577 \u0026amp; up) equipped \u003cstrong\u003ewith exhaust bellows\u003c\/strong\u003e. Replaces OEM 30-803097T1 and Sierra 18-2601-1.\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════════════════════════════════════════════════════════════\n       LAYER 2: TECHNICAL CORE (Compatibility \u0026 Kit Contents)\n       ═══════════════════════════════════════════════════════════════════ --\u003e\n\n  \u003ch2\u003eCompatibility Guide\u003c\/h2\u003e\n  \u003cp\u003eUse this compatibility guide as a reference only. Compatibility may vary by engine model, drive type, and serial number. Always verify your drive serial number before ordering.\u003c\/p\u003e\n  \u003cdiv class=\"jlm-table-wrap\"\u003e\n    \u003ctable\u003e\n      \u003cthead\u003e\n        \u003ctr\u003e\n          \u003cth\u003eDrive Family\u003c\/th\u003e\n          \u003cth\u003eYears (Approx.)\u003c\/th\u003e\n          \u003cth\u003eSerial Number Range\u003c\/th\u003e\n          \u003cth\u003eNotes\u003c\/th\u003e\n        \u003c\/tr\u003e\n      \u003c\/thead\u003e\n      \u003ctbody\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser R \/ MR\u003c\/td\u003e\n          \u003ctd\u003e1983 – 1990\u003c\/td\u003e\n          \u003ctd\u003e6225577 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003eWith exhaust bellows\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser Alpha One Gen I\u003c\/td\u003e\n          \u003ctd\u003e1983 – 1990\u003c\/td\u003e\n          \u003ctd\u003e6225577 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003eWith exhaust bellows\u003c\/td\u003e\n        \u003c\/tr\u003e\n        \u003ctr\u003e\n          \u003ctd\u003eMerCruiser Alpha One SS\u003c\/td\u003e\n          \u003ctd\u003e1986 – 1989\u003c\/td\u003e\n          \u003ctd\u003e0A545004 \u0026amp; Up\u003c\/td\u003e\n          \u003ctd\u003eWith exhaust bellows\u003c\/td\u003e\n        \u003c\/tr\u003e\n      \u003c\/tbody\u003e\n    \u003c\/table\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eWhat's Included \u0026amp; Specifications\u003c\/h2\u003e\n  \u003cdiv class=\"jlm-grid\"\u003e\n    \u003cdiv class=\"jlm-card\"\u003e\n      \u003ch3\u003eKit Contents\u003c\/h3\u003e\n      \u003cul\u003e\n        \u003cli\u003e1 x U-Joint Bellows Assembly (replaces 60932A4)\u003c\/li\u003e\n        \u003cli\u003e1 x Exhaust Bellows (replaces 18654A1 \/ 32734A3)\u003c\/li\u003e\n        \u003cli\u003e1 x Shift Cable Bellows (replaces 74639 \/ 74639A2)\u003c\/li\u003e\n        \u003cli\u003e1 x Gimbal Bearing — Greasable (replaces 30-60794A4 \/ 30-60794A2)\u003c\/li\u003e\n        \u003cli\u003e1 x 3\/4\" Water Intake Hose (replaces 32-32461)\u003c\/li\u003e\n        \u003cli\u003e1 x 5\/8\" Water Intake Hose (replaces 32-41725-33)\u003c\/li\u003e\n        \u003cli\u003e1 x Transom Bell Housing Gasket Set (replaces 27-94996A1 \/ 27-94996T2)\u003c\/li\u003e\n        \u003cli\u003eStainless Steel Hose Clamps and Mounting O-Rings\u003c\/li\u003e\n      \u003c\/ul\u003e\n      \u003cp style=\"margin-bottom:0;\"\u003e\u003cem\u003e\u003csmall\u003ePackage contents may vary slightly; please confirm with product photos.\u003c\/small\u003e\u003c\/em\u003e\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-card\"\u003e\n      \u003ch3\u003eSpecifications\u003c\/h3\u003e\n      \u003cul\u003e\n        \u003cli\u003e\n\u003cstrong\u003eDrive Type:\u003c\/strong\u003e MerCruiser R, MR, Alpha One Gen I, Alpha One SS\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eExhaust Configuration:\u003c\/strong\u003e With Exhaust Bellows\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eBearing Type:\u003c\/strong\u003e Greasable (zerk fitting compatible)\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Marine-Grade Rubber \/ Stainless Steel\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eHose Sizes:\u003c\/strong\u003e 3\/4\" and 5\/8\" included\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e Approx. 5.4 lbs\u003c\/li\u003e\n        \u003cli\u003e\n\u003cstrong\u003eCondition:\u003c\/strong\u003e Brand New — Aftermarket\u003c\/li\u003e\n      \u003c\/ul\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003c!-- ═══════════════════════════════════════════════════════════════════\n       LAYER 3: MARKETING, EDUCATION \u0026 GEO OPTIMIZATION\n       ═══════════════════════════════════════════════════════════════════ --\u003e\n\n  \u003ch2\u003eProduct Overview\u003c\/h2\u003e\n  \u003cp\u003eTransom bellows are the primary barrier keeping water out of your boat's hull and engine compartment. They naturally degrade from UV exposure, marine growth, heat cycling, and constant flexing during trim and steering operations. A cracked U-joint bellows is one of the most common — and most expensive — failures on MerCruiser sterndrives.\u003c\/p\u003e\n  \u003cp\u003e\u003cstrong\u003eWhat happens if you don't replace it?\u003c\/strong\u003e Water enters through the compromised seal, rapidly corroding the gimbal bearing and U-joints. Left unchecked, this leads to catastrophic water intrusion. The cost of replacing rusted U-joints, a seized gimbal bearing, and repairing water damage can easily exceed \u003cstrong\u003e$2,000–$3,000\u003c\/strong\u003e in parts and labor.\u003c\/p\u003e\n  \u003cp\u003eReplacing the complete transom seal kit during routine maintenance (typically every 3–5 years, or sooner if you notice any cracking) is a fraction of the cost of emergency repairs. This comprehensive service kit includes all essential components for a complete transom rebuild, saving you time and multiple shipping costs.\u003c\/p\u003e\n\n  \u003ch2\u003eTop Features \/ Key Benefits\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eMarine-Grade Rubber Construction:\u003c\/strong\u003e Engineered to resist UV degradation, saltwater exposure, and heat cycling — helping prevent the costly water intrusion that destroys U-joints and engine compartments.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eComplete Service Kit:\u003c\/strong\u003e Includes all bellows, hoses, bearing, gaskets, and clamps — no need to source parts individually, saving you time and multiple shipping costs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eUniversal Hose Fitment:\u003c\/strong\u003e Includes both 5\/8\" and 3\/4\" water intake hoses to ensure proper fitment regardless of your specific engine configuration.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect Replacement:\u003c\/strong\u003e Designed as a direct replacement for OEM part 30-803097T1 and listed aftermarket equivalents, suitable for routine marine maintenance.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eGreasable Gimbal Bearing:\u003c\/strong\u003e Allows routine lubrication via zerk fitting, extending bearing life and reducing long-term maintenance costs.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eStainless Steel Hardware:\u003c\/strong\u003e All included hose clamps are stainless steel for corrosion resistance in saltwater environments.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDifficulty Level:\u003c\/strong\u003e Advanced — requires removing the outdrive unit and specialized tools. Typical installation time is 2–6 hours depending on experience.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRequired Tools:\u003c\/strong\u003e Bellows expansion tool (e.g., 91-45497A1), hinge pin tool, engine alignment tool, slide hammer kit (for gimbal bearing removal), and a 1\/4\" wobble extension with 1\/4\" or 5\/16\" socket.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Apply marine-grade bellows adhesive (like Quicksilver 92-86166Q1 or Sierra #18-9031) to the U-joint, shift cable, and exhaust bellows to prevent them from coming loose when the drive is tilted. \u003cstrong\u003eDo NOT get adhesive on the teeth of the housing.\u003c\/strong\u003e\n\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003ePro Tip:\u003c\/strong\u003e Ensure hose clamp screws are positioned correctly before tightening so they don't rub against the bellows when the drive is trimmed up.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eRecommended Co-Replacement:\u003c\/strong\u003e While the sterndrive is removed, consider replacing the lower shift cable, water pump impeller kit, trim limit switch, and trim sender to avoid repeating this labor-intensive job. Replacing all components simultaneously is highly recommended.\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\n  \u003cdiv class=\"jlm-faq\"\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eWhat's the difference between the Gen I and Gen II transom seal kit?\u003c\/h3\u003e\n      \u003cp\u003eThe Gen I kit (30-803097T1) fits MerCruiser Alpha One drives manufactured approximately 1983–1990 with serial numbers 6225577 and up. The Gen II kit (30-803099T1) fits Alpha One Gen II drives from 1991 and newer (serial 0D469859 and up). The two are NOT interchangeable — the bellows dimensions, shift cable bellows design, and mounting points are different. If your drive has a plastic U-joint shaft cover, 6 transom assembly bolts instead of 4, or trim cylinders mounted with C-clips, it's likely a Gen II.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eDoes this kit include the exhaust bellows?\u003c\/h3\u003e\n      \u003cp\u003eYes. This is the complete kit with exhaust bellows included. It contains the U-joint bellows, exhaust bellows, shift cable bellows, gimbal bearing, both water intake hoses (5\/8\" and 3\/4\"), transom gasket set, and all necessary stainless steel clamps and O-rings.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eHow often should I replace my MerCruiser transom bellows?\u003c\/h3\u003e\n      \u003cp\u003eMost marine mechanics recommend inspecting transom bellows every 2 years and replacing them every 3–5 years, or immediately if you notice any cracking, hardening, or signs of water intrusion. Boats stored in the water year-round or operated in saltwater may need more frequent replacement.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eCan I install this transom seal kit myself, or do I need a mechanic?\u003c\/h3\u003e\n      \u003cp\u003eThis is an advanced DIY job that requires specialized tools (bellows expander, hinge pin tool, alignment tool, slide hammer) and familiarity with sterndrive removal. If you have mechanical experience and the proper tools, it's achievable in 4–6 hours. If you're unfamiliar with the process, we recommend hiring a certified marine mechanic — improper installation can lead to water leaks.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eWhy does this kit include two different water hoses?\u003c\/h3\u003e\n      \u003cp\u003eThe kit includes both a 5\/8\" and a 3\/4\" water intake hose because different engine and drive configurations use different hose sizes. You will only use the one that matches your current setup — check your existing hose diameter before installation.\u003c\/p\u003e\n    \u003c\/div\u003e\n    \u003cdiv class=\"jlm-faq-item\"\u003e\n      \u003ch3\u003eIs the gimbal bearing in this kit greasable or sealed?\u003c\/h3\u003e\n      \u003cp\u003eThis kit includes a greasable gimbal bearing with a zerk fitting. This allows routine lubrication through the transom assembly's grease fitting, which extends bearing life significantly compared to sealed bearings that cannot be maintained.\u003c\/p\u003e\n    \u003c\/div\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eWhy Choose JLM MARINE?\u003c\/h2\u003e\n  \u003cdiv class=\"jlm-brand-trust\"\u003e\n  \u003cul\u003e\n    \u003cli\u003e\n\u003cstrong\u003eQuality Assured:\u003c\/strong\u003e As a trusted manufacturer for over 20 years, we supply top marine brands globally.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eFast Global Shipping:\u003c\/strong\u003e Free delivery worldwide in 5-15 days.\u003c\/li\u003e\n    \u003cli\u003e\n\u003cstrong\u003eDirect from Manufacturer:\u003c\/strong\u003e Competitive pricing without compromising quality.\u003c\/li\u003e\n  \u003c\/ul\u003e\n  \u003c\/div\u003e\n\n  \u003ch2\u003eRelated JLM Marine Parts\u003c\/h2\u003e\n  \u003cul\u003e\n    \u003cli\u003e\u003ca href=\"\/es\/collections\/shift-cables\"\u003eMerCruiser Alpha One Lower Shift Cables\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/es\/collections\/water-pumps\"\u003eMerCruiser Alpha One Water Pump Impeller Kits\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/es\/collections\/marine-lubricants\"\u003eBellows Adhesive \u0026amp; Marine Lubricants\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/es\/collections\/specialty-tools\"\u003eBellows Expansion Tools \u0026amp; Hinge Pin Tools\u003c\/a\u003e\u003c\/li\u003e\n    \u003cli\u003e\u003ca href=\"\/es\/collections\/mercruiser-alpha-one-parts\"\u003eAll MerCruiser Alpha One Gen I Parts\u003c\/a\u003e\u003c\/li\u003e\n  \u003c\/ul\u003e\n\n  \u003cdiv class=\"jlm-disclaimer\"\u003e\n    \u003cstrong\u003eFitment Disclaimer:\u003c\/strong\u003e Compatibility may vary by engine model, drive type, and serial number. We strongly recommend verifying your engine\/drive serial number against the OEM part numbers listed above before ordering. When in doubt, compare with your original part or consult your service manual.\n  \u003c\/div\u003e\n\n\u003c\/div\u003e\n","brand":"Mercruiser","offers":[{"title":"Default Title","offer_id":53316135092537,"sku":"18BK001","price":60.77,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0885\/0433\/6697\/files\/30-803097T1_1_da74fd98-fed0-4477-b2a2-d212f8379e96.png?v=1779415902","url":"https:\/\/jlmmarine.com\/es\/products\/30-803097t1-mercruiser-alpha-one-gen-1-transom-seal-kit","provider":"JLM Marine Boat Parts Limited","version":"1.0","type":"link"}