{"product_id":"lower-unit-assembly-6p3-45300-51-8d","title":"Lower Unit Assembly - 6P3-45300-51-8D","description":"\u003ch2 data-section-id=\"1jk8x4\" data-start=\"0\" data-end=\"70\"\u003eYamaha - Lower Unit Assembly - Gearcase Component - 6P3-45300-51-8D\u003c\/h2\u003e\n\u003chr data-start=\"72\" data-end=\"75\"\u003e\n\u003ch2 data-section-id=\"rzkdgm\" data-start=\"77\" data-end=\"88\"\u003eOverview\u003c\/h2\u003e\n\u003cp data-start=\"89\" data-end=\"509\"\u003eWhen a lower unit starts going bad, you usually feel it before you see it—noise, vibration, or just not running as smooth as it used to. I’ve swapped enough of these to know that going with a complete assembly saves a lot of guesswork and time. Everything is already matched and set up the way Yamaha intended. It’s the kind of replacement that gets you back on the water with confidence instead of chasing small issues.\u003c\/p\u003e\n\u003chr data-start=\"511\" data-end=\"514\"\u003e\n\u003ch2 data-section-id=\"1ma7m6t\" data-start=\"516\" data-end=\"531\"\u003eKey Features\u003c\/h2\u003e\n\u003cp data-start=\"532\" data-end=\"936\"\u003e• \u003cstrong data-start=\"534\" data-end=\"564\"\u003eComplete Gearcase Assembly\u003c\/strong\u003e – Includes integrated internal components for a full replacement solution.\u003cbr data-start=\"639\" data-end=\"642\"\u003e• \u003cstrong data-start=\"644\" data-end=\"670\"\u003eOEM Matched Components\u003c\/strong\u003e – Built to factory specs for proper alignment and smooth operation.\u003cbr data-start=\"738\" data-end=\"741\"\u003e• \u003cstrong data-start=\"743\" data-end=\"771\"\u003eEfficient Power Transfer\u003c\/strong\u003e – Ensures consistent delivery of engine power to the propeller.\u003cbr data-start=\"835\" data-end=\"838\"\u003e• \u003cstrong data-start=\"840\" data-end=\"871\"\u003eDurable Marine Construction\u003c\/strong\u003e – Designed to handle load, impact, and harsh water conditions.\u003c\/p\u003e\n\u003chr data-start=\"938\" data-end=\"941\"\u003e\n\u003ch2 data-section-id=\"1qx5o2j\" data-start=\"943\" data-end=\"973\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/h2\u003e\n\u003cp data-start=\"974\" data-end=\"1174\"\u003eDesigned for Yamaha outboard engines requiring a complete lower unit replacement. Commonly used across a range of Yamaha outboards where reliable gearcase performance and power transfer are essential.\u003c\/p\u003e\n\u003chr data-start=\"1176\" data-end=\"1179\"\u003e\n\u003ch2 data-section-id=\"1hryhf7\" data-start=\"1181\" data-end=\"1187\"\u003eFAQ\u003c\/h2\u003e\n\u003cp data-start=\"1189\" data-end=\"1316\"\u003e\u003cstrong data-start=\"1189\" data-end=\"1242\"\u003eQ: What are signs the lower unit needs replacing?\u003c\/strong\u003e\u003cbr data-start=\"1242\" data-end=\"1245\"\u003eA: Grinding noise, water in gear oil, vibration, or loss of propulsion.\u003c\/p\u003e\n\u003cp data-start=\"1318\" data-end=\"1444\"\u003e\u003cstrong data-start=\"1318\" data-end=\"1375\"\u003eQ: Can I rebuild instead of replacing the whole unit?\u003c\/strong\u003e\u003cbr data-start=\"1375\" data-end=\"1378\"\u003eA: You can, but a full assembly is often faster and more reliable.\u003c\/p\u003e\n\u003cp data-start=\"1446\" data-end=\"1547\"\u003e\u003cstrong data-start=\"1446\" data-end=\"1493\"\u003eQ: Does this come pre-filled with gear oil?\u003c\/strong\u003e\u003cbr data-start=\"1493\" data-end=\"1496\"\u003eA: Typically no, you’ll need to fill it before use.\u003c\/p\u003e\n\u003cp data-start=\"1549\" data-end=\"1661\"\u003e\u003cstrong data-start=\"1549\" data-end=\"1585\"\u003eQ: Any tips before installation?\u003c\/strong\u003e\u003cbr data-start=\"1585\" data-end=\"1588\"\u003eA: Check seals, align the driveshaft carefully, and torque bolts to spec.\u003c\/p\u003e\n\u003cp data-start=\"1663\" data-end=\"1799\"\u003e\u003cstrong data-start=\"1663\" data-end=\"1715\"\u003eQ: How does saltwater use affect the lower unit?\u003c\/strong\u003e\u003cbr data-start=\"1715\" data-end=\"1718\"\u003eA: It increases corrosion risk, so regular flushing and inspection are important.\u003c\/p\u003e","brand":"Yamaha","offers":[{"title":"Default Title","offer_id":46936874647843,"sku":"6P3-45300-51-8D","price":5161.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/PV259041.jpg?v=1698799141","url":"https:\/\/partsvu.com\/en-ca\/products\/lower-unit-assembly-6p3-45300-51-8d","provider":"PartsVu","version":"1.0","type":"link"}