{"product_id":"mercury-pin-trilobe-17-821539","title":"Mercury – Quicksilver 821539 Trilobe Pin | Mercury 2-Stroke \u0026 4-Stroke Outboards | 821539","description":"\u003cp data-start=\"0\" data-end=\"95\"\u003e\u003cstrong data-start=\"0\" data-end=\"93\"\u003eMercury – Quicksilver 821539 Trilobe Pin | Mercury 2-Stroke \u0026amp; 4-Stroke Outboards | 821539\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"97\" data-end=\"100\"\u003e\n\u003ch3 data-start=\"102\" data-end=\"120\"\u003e\u003cstrong data-start=\"106\" data-end=\"118\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"121\" data-end=\"447\"\u003eIt’s the little pieces that keep everything working right. The \u003cstrong data-start=\"184\" data-end=\"214\"\u003eMercury 821539 Trilobe Pin\u003c\/strong\u003e might look simple, but it plays an important part in how your \u003cstrong data-start=\"277\" data-end=\"318\"\u003eMercury 2-stroke or 4-stroke outboard\u003c\/strong\u003e runs. This genuine OEM pin keeps key parts properly aligned and secure, so your motor stays smooth and solid out on the water.\u003c\/p\u003e\n\u003cp data-start=\"449\" data-end=\"721\"\u003eBuilt from hardened, marine-grade steel, it’s made to handle years of vibration, torque, and salt exposure without wearing out or bending. When the old pin starts to loosen or corrode, swapping it for a factory-fresh one keeps your outboard feeling tight and dependable.\u003c\/p\u003e\n\u003chr data-start=\"723\" data-end=\"726\"\u003e\n\u003ch3 data-start=\"728\" data-end=\"750\"\u003e\u003cstrong data-start=\"732\" data-end=\"748\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"753\" data-end=\"845\"\u003e\n\u003cstrong data-start=\"753\" data-end=\"765\"\u003ePurpose:\u003c\/strong\u003e Keeps components correctly aligned and secured inside your outboard assembly.\u003c\/li\u003e\n\u003cli data-start=\"848\" data-end=\"971\"\u003e\n\u003cstrong data-start=\"848\" data-end=\"860\"\u003eFitment:\u003c\/strong\u003e Designed for \u003cstrong data-start=\"874\" data-end=\"924\"\u003eselect Mercury 2-stroke and 4-stroke outboards\u003c\/strong\u003e (check your service manual for exact match).\u003c\/li\u003e\n\u003cli data-start=\"974\" data-end=\"1063\"\u003e\n\u003cstrong data-start=\"974\" data-end=\"987\"\u003eMaterial:\u003c\/strong\u003e Made from \u003cstrong data-start=\"998\" data-end=\"1023\"\u003ehardened marine steel\u003c\/strong\u003e that won’t rust or deform under load.\u003c\/li\u003e\n\u003cli data-start=\"1066\" data-end=\"1147\"\u003e\n\u003cstrong data-start=\"1066\" data-end=\"1078\"\u003eOEM Fit:\u003c\/strong\u003e Precision-machined to \u003cstrong data-start=\"1101\" data-end=\"1126\"\u003eMercury factory specs\u003c\/strong\u003e for a perfect fit.\u003c\/li\u003e\n\u003cli data-start=\"1150\" data-end=\"1249\"\u003e\n\u003cstrong data-start=\"1150\" data-end=\"1163\"\u003eEasy Fix:\u003c\/strong\u003e Simple to install with standard hand tools — quick maintenance you can do yourself.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1251\" data-end=\"1254\"\u003e\n\u003ch3 data-start=\"1256\" data-end=\"1293\"\u003e\u003cstrong data-start=\"1260\" data-end=\"1291\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1296\" data-end=\"1355\"\u003eFits a variety of Mercury 2-stroke and 4-stroke outboards\u003c\/li\u003e\n\u003cli data-start=\"1358\" data-end=\"1422\"\u003eCommon on smaller fishing rigs, pontoons, and portable engines\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1424\" data-end=\"1427\"\u003e\n\u003ch3 data-start=\"1429\" data-end=\"1472\"\u003e\u003cstrong data-start=\"1433\" data-end=\"1470\"\u003ePerformance \u0026amp; Real-World Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1473\" data-end=\"1823\"\u003eThe \u003cstrong data-start=\"1477\" data-end=\"1499\"\u003e821539 Trilobe Pin\u003c\/strong\u003e keeps everything in line — literally. It prevents unwanted play or vibration in your linkage or drive assembly, helping your engine run smoothly and quietly. Over time, pins wear down or corrode, causing slop or uneven movement. Replacing it restores that snug, precise feel and helps prevent further wear on other parts.\u003c\/p\u003e\n\u003cp data-start=\"1825\" data-end=\"1995\"\u003eIt’s a quick, low-cost job that saves headaches later. One solid, well-fitted pin can make the difference between a motor that feels loose and one that feels brand new.\u003c\/p\u003e\n\u003chr data-start=\"1997\" data-end=\"2000\"\u003e\n\u003ch3 data-start=\"2002\" data-end=\"2026\"\u003e\u003cstrong data-start=\"2006\" data-end=\"2024\"\u003eWhy Choose OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2027\" data-end=\"2262\"\u003eMercury’s OEM hardware is built for marine life — constant moisture, heat, and vibration. Cheap aftermarket pins might look similar but usually don’t match the same hardness or corrosion resistance, which can cause premature failure.\u003c\/p\u003e\n\u003cp data-start=\"2264\" data-end=\"2452\"\u003eA \u003cstrong data-start=\"2266\" data-end=\"2301\"\u003egenuine Quicksilver trilobe pin\u003c\/strong\u003e is made to exact tolerances and tested under real boating conditions. It’s small peace of mind that makes a big difference in long-term reliability.\u003c\/p\u003e\n\u003chr data-start=\"2454\" data-end=\"2457\"\u003e\n\u003ch3 data-start=\"2459\" data-end=\"2472\"\u003e\u003cstrong data-start=\"2463\" data-end=\"2470\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2473\" data-end=\"2626\"\u003e\u003cstrong data-start=\"2473\" data-end=\"2521\"\u003eQ1: What engines use the 821539 Trilobe Pin?\u003c\/strong\u003e\u003cbr data-start=\"2521\" data-end=\"2524\"\u003eA: It’s made for \u003cstrong data-start=\"2541\" data-end=\"2591\"\u003eselect Mercury 2-stroke and 4-stroke outboards\u003c\/strong\u003e — check your manual for details.\u003c\/p\u003e\n\u003cp data-start=\"2628\" data-end=\"2768\"\u003e\u003cstrong data-start=\"2628\" data-end=\"2658\"\u003eQ2: What does this pin do?\u003c\/strong\u003e\u003cbr data-start=\"2658\" data-end=\"2661\"\u003eA: It holds and aligns key moving parts in your motor or lower unit, preventing slippage or misalignment.\u003c\/p\u003e\n\u003cp data-start=\"2770\" data-end=\"2854\"\u003e\u003cstrong data-start=\"2770\" data-end=\"2798\"\u003eQ3: What’s it made from?\u003c\/strong\u003e\u003cbr data-start=\"2798\" data-end=\"2801\"\u003eA: High-strength, corrosion-resistant marine steel.\u003c\/p\u003e\n\u003cp data-start=\"2856\" data-end=\"2952\"\u003e\u003cstrong data-start=\"2856\" data-end=\"2890\"\u003eQ4: Is installation difficult?\u003c\/strong\u003e\u003cbr data-start=\"2890\" data-end=\"2893\"\u003eA: Not at all. It installs easily using basic hand tools.\u003c\/p\u003e\n\u003cp data-start=\"2954\" data-end=\"3092\"\u003e\u003cstrong data-start=\"2954\" data-end=\"2993\"\u003eQ5: Why OEM instead of aftermarket?\u003c\/strong\u003e\u003cbr data-start=\"2993\" data-end=\"2996\"\u003eA: OEM pins fit perfectly, last longer, and handle marine stress better than generic versions.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":45626526007587,"sku":"17-821539","price":4.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/821539_main.jpg?v=1760631233","url":"https:\/\/partsvu.com\/en-au\/products\/mercury-pin-trilobe-17-821539","provider":"PartsVu","version":"1.0","type":"link"}