{"product_id":"mercury-mercruiser-shift-shaft-bushing-fits-alpha-one-gen-ii-23-815921a21","title":"Mercury – Quicksilver 815921A21 Shift Shaft Bushing Kit | MerCruiser Alpha One Gen II Sterndrives | 815921A21","description":"\u003cp data-start=\"0\" data-end=\"115\"\u003e\u003cstrong data-start=\"0\" data-end=\"113\"\u003eMercury – Quicksilver 815921A21 Shift Shaft Bushing Kit | MerCruiser Alpha One Gen II Sterndrives | 815921A21\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"117\" data-end=\"120\"\u003e\n\u003ch3 data-start=\"122\" data-end=\"140\"\u003e\u003cstrong data-start=\"126\" data-end=\"138\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"141\" data-end=\"453\"\u003eSmooth, precise shifting doesn’t just happen — it depends on small parts like this one doing their job. The \u003cstrong data-start=\"249\" data-end=\"298\"\u003eQuicksilver 815921A21 Shift Shaft Bushing Kit\u003c\/strong\u003e keeps your \u003cstrong data-start=\"310\" data-end=\"352\"\u003eMerCruiser Alpha One Gen II sterndrive\u003c\/strong\u003e shifting cleanly and reliably by sealing and supporting the shift shaft assembly inside the drive.\u003c\/p\u003e\n\u003cp data-start=\"455\" data-end=\"718\"\u003eOver time, bushings and seals wear down from water exposure and constant motion, leading to sloppy shifting or leaks. This OEM kit replaces everything you need in one go, restoring that factory feel when you move the throttle from neutral to forward or reverse.\u003c\/p\u003e\n\u003chr data-start=\"720\" data-end=\"723\"\u003e\n\u003ch3 data-start=\"725\" data-end=\"747\"\u003e\u003cstrong data-start=\"729\" data-end=\"745\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"750\" data-end=\"867\"\u003e\n\u003cstrong data-start=\"750\" data-end=\"762\"\u003ePurpose:\u003c\/strong\u003e Replaces worn or leaking bushings and seals in the shift shaft assembly for smooth, accurate shifting.\u003c\/li\u003e\n\u003cli data-start=\"870\" data-end=\"955\"\u003e\n\u003cstrong data-start=\"870\" data-end=\"882\"\u003eFitment:\u003c\/strong\u003e Designed specifically for \u003cstrong data-start=\"909\" data-end=\"952\"\u003eMerCruiser Alpha One Gen II sterndrives\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli data-start=\"958\" data-end=\"1070\"\u003e\n\u003cstrong data-start=\"958\" data-end=\"975\"\u003eKit Contents:\u003c\/strong\u003e Includes \u003cstrong data-start=\"985\" data-end=\"1023\"\u003ehousing pieces, seals, and zip tie\u003c\/strong\u003e — a complete five-piece OEM replacement set.\u003c\/li\u003e\n\u003cli data-start=\"1073\" data-end=\"1177\"\u003e\n\u003cstrong data-start=\"1073\" data-end=\"1091\"\u003eBuild Quality:\u003c\/strong\u003e Made from \u003cstrong data-start=\"1102\" data-end=\"1128\"\u003emarine-grade materials\u003c\/strong\u003e to resist corrosion, heat, and saltwater wear.\u003c\/li\u003e\n\u003cli data-start=\"1180\" data-end=\"1294\"\u003e\n\u003cstrong data-start=\"1180\" data-end=\"1198\"\u003eOEM Precision:\u003c\/strong\u003e Built to \u003cstrong data-start=\"1208\" data-end=\"1240\"\u003eMercury Marine factory specs\u003c\/strong\u003e for proper fit, sealing, and long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1296\" data-end=\"1299\"\u003e\n\u003ch3 data-start=\"1301\" data-end=\"1338\"\u003e\u003cstrong data-start=\"1305\" data-end=\"1336\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1341\" data-end=\"1402\"\u003eCompatible with \u003cstrong data-start=\"1357\" data-end=\"1400\"\u003eMerCruiser Alpha One Gen II sterndrives\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli data-start=\"1405\" data-end=\"1496\"\u003eCommon on cruisers, bowriders, fishing boats, and performance rigs using MerCruiser power\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1498\" data-end=\"1501\"\u003e\n\u003ch3 data-start=\"1503\" data-end=\"1545\"\u003e\u003cstrong data-start=\"1507\" data-end=\"1543\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1546\" data-end=\"1816\"\u003eThe \u003cstrong data-start=\"1550\" data-end=\"1567\"\u003e815921A21 kit\u003c\/strong\u003e takes the play out of worn shift components and restores that crisp, confident feel when engaging gears. A proper seal around the shaft also keeps water out and gear lube in — critical for avoiding internal corrosion and costly lower unit damage.\u003c\/p\u003e\n\u003cp data-start=\"1818\" data-end=\"2131\"\u003eEach piece in the kit is engineered to hold up to marine abuse — temperature swings, vibration, and repeated gear changes. The materials maintain their shape and sealing ability even after long hours of use. With this OEM set, you’ll get back the solid, precise shifting that makes Mercury drives so dependable.\u003c\/p\u003e\n\u003chr data-start=\"2133\" data-end=\"2136\"\u003e\n\u003ch3 data-start=\"2138\" data-end=\"2159\"\u003e\u003cstrong data-start=\"2142\" data-end=\"2157\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2160\" data-end=\"2452\"\u003eWhen it comes to shift components, tolerances matter. Mercury’s OEM kits are made to the exact dimensions and materials required for a tight, leak-free fit. Aftermarket kits often cut corners with softer plastics or seals that don’t quite align, leading to premature wear or gearcase leaks.\u003c\/p\u003e\n\u003cp data-start=\"2454\" data-end=\"2695\"\u003eBy using genuine Quicksilver parts, you’re putting the same components back into your drive that Mercury installs from the factory. It’s the simplest way to make sure your sterndrive shifts cleanly and stays protected from water intrusion.\u003c\/p\u003e\n\u003chr data-start=\"2697\" data-end=\"2700\"\u003e\n\u003ch3 data-start=\"2702\" data-end=\"2715\"\u003e\u003cstrong data-start=\"2706\" data-end=\"2713\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2716\" data-end=\"2841\"\u003e\u003cstrong data-start=\"2716\" data-end=\"2775\"\u003eQ1: What drives does the Quicksilver 815921A21 kit fit?\u003c\/strong\u003e\u003cbr data-start=\"2775\" data-end=\"2778\"\u003eA: It’s made for \u003cstrong data-start=\"2795\" data-end=\"2838\"\u003eMerCruiser Alpha One Gen II sterndrives\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2843\" data-end=\"2965\"\u003e\u003cstrong data-start=\"2843\" data-end=\"2878\"\u003eQ2: What’s included in the kit?\u003c\/strong\u003e\u003cbr data-start=\"2878\" data-end=\"2881\"\u003eA: The kit comes with \u003cstrong data-start=\"2903\" data-end=\"2943\"\u003ehousing pieces, seals, and a zip tie\u003c\/strong\u003e — five parts total.\u003c\/p\u003e\n\u003cp data-start=\"2967\" data-end=\"3117\"\u003e\u003cstrong data-start=\"2967\" data-end=\"2998\"\u003eQ3: What does this kit fix?\u003c\/strong\u003e\u003cbr data-start=\"2998\" data-end=\"3001\"\u003eA: It replaces worn shift shaft bushings and seals that can cause loose or stiff shifting and potential oil leaks.\u003c\/p\u003e\n\u003cp data-start=\"3119\" data-end=\"3305\"\u003e\u003cstrong data-start=\"3119\" data-end=\"3151\"\u003eQ4: Can I install it myself?\u003c\/strong\u003e\u003cbr data-start=\"3151\" data-end=\"3154\"\u003eA: Yes. If you’re comfortable working with your sterndrive’s shift system, installation is straightforward with the right tools and a service manual.\u003c\/p\u003e\n\u003cp data-start=\"3307\" data-end=\"3484\"\u003e\u003cstrong data-start=\"3307\" data-end=\"3359\"\u003eQ5: Why choose Quicksilver OEM over aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"3359\" data-end=\"3362\"\u003eA: OEM kits ensure a perfect fit, better sealing, and proven durability — keeping your drive reliable for the long haul.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46941041033507,"sku":"23-815921A21","price":35.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/815921a21.jpg?v=1761162055","url":"https:\/\/partsvu.com\/en-ca\/products\/mercury-mercruiser-shift-shaft-bushing-fits-alpha-one-gen-ii-23-815921a21","provider":"PartsVu","version":"1.0","type":"link"}