{"product_id":"mercury-se221-lower-unit-1-75-1-62","title":"Mercury Outboard Lower Unit Replacement – Fits 3.0L, 2.6L, 1.7L – 1.62 \u0026 1.75 Ratio – Standard Rotation – SE221","description":"\u003ch3 data-section-id=\"19qs8qr\" data-start=\"568\" data-end=\"615\"\u003eReliable Power Starts Below the Waterline\u003c\/h3\u003e\n\u003cp data-start=\"616\" data-end=\"882\"\u003eIf your Mercury outboard is struggling with performance, noise, or gear failure, your lower unit may be the issue. The \u003cstrong data-start=\"735\" data-end=\"769\"\u003eSE221 lower unit by SEI Marine\u003c\/strong\u003e is a high-quality replacement designed to restore smooth operation, power transfer, and confidence on the water.\u003c\/p\u003e\n\u003ch3 data-section-id=\"f04ws8\" data-start=\"884\" data-end=\"923\"\u003eBuilt for Performance \u0026amp; Longevity\u003c\/h3\u003e\n\u003cp data-start=\"924\" data-end=\"1199\"\u003eEngineered to meet or exceed OEM specifications, this gearcase is compatible with select \u003cstrong data-start=\"1013\" data-end=\"1074\"\u003e3.0L V6, 2.6L Inline 6, and 1.7L Inline 4 Mercury engines\u003c\/strong\u003e. Whether you're cruising, fishing, or working, this unit delivers dependable performance under real-world marine conditions.\u003c\/p\u003e\n\u003ch3 data-section-id=\"107tsoz\" data-start=\"1201\" data-end=\"1253\"\u003ePerfect for Boat Owners Who Demand Reliability\u003c\/h3\u003e\n\u003cp data-start=\"1254\" data-end=\"1430\"\u003eIdeal for recreational boaters, fishing enthusiasts, and marine professionals who need a \u003cstrong data-start=\"1343\" data-end=\"1401\"\u003ecost-effective, durable alternative to OEM lower units\u003c\/strong\u003e without sacrificing quality.\u003c\/p\u003e\n\u003ch3 data-section-id=\"1ilp9d1\" data-start=\"1432\" data-end=\"1455\"\u003eWhy Choose SE221?\u003c\/h3\u003e\n\u003cp data-start=\"1456\" data-end=\"1671\"\u003eUnlike worn or rebuilt units, the SE221 is \u003cstrong data-start=\"1499\" data-end=\"1512\"\u003ebrand new\u003c\/strong\u003e, precision-built, and tested for reliability. It’s trusted by marine technicians and boat owners for its \u003cstrong data-start=\"1618\" data-end=\"1670\"\u003estrength, smooth shifting, and long service life\u003c\/strong\u003e.\u003c\/p\u003e\n\u003chr data-start=\"1673\" data-end=\"1676\"\u003e\n\u003ch2 data-section-id=\"14at72t\" data-start=\"1678\" data-end=\"1695\"\u003eKey Features\u003c\/h2\u003e\n\u003cul data-start=\"1697\" data-end=\"2074\"\u003e\n\u003cli data-section-id=\"1sqrci8\" data-start=\"1697\" data-end=\"1752\"\u003e\n\u003cp data-start=\"1699\" data-end=\"1752\"\u003eHeavy-duty construction for long-lasting durability\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"18obfbp\" data-start=\"1753\" data-end=\"1811\"\u003e\n\u003cp data-start=\"1755\" data-end=\"1811\"\u003ePrecision-engineered gears for smooth, quiet operation\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"ayi6uw\" data-start=\"1812\" data-end=\"1858\"\u003e\n\u003cp data-start=\"1814\" data-end=\"1858\"\u003eAvailable in \u003cstrong data-start=\"1827\" data-end=\"1856\"\u003e1.62 and 1.75 gear ratios\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"198rioz\" data-start=\"1859\" data-end=\"1911\"\u003e\n\u003cp data-start=\"1861\" data-end=\"1911\"\u003eمتعدد shaft length options (20\", 25\", 30\", Stub)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"157s4mu\" data-start=\"1912\" data-end=\"1970\"\u003e\n\u003cp data-start=\"1914\" data-end=\"1970\"\u003eCompatible with multiple Mercury engine configurations\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"rk1cxq\" data-start=\"1971\" data-end=\"2031\"\u003e\n\u003cp data-start=\"1973\" data-end=\"2031\"\u003eCorrosion-resistant finish for harsh marine environments\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"14x5x4\" data-start=\"2032\" data-end=\"2074\"\u003e\n\u003cp data-start=\"2034\" data-end=\"2074\"\u003eBacked by SEI Marine quality assurance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"2076\" data-end=\"2079\"\u003e\n\u003ch2 data-section-id=\"58xi60\" data-start=\"2081\" data-end=\"2110\"\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cdiv class=\"TyagGW_tableContainer\"\u003e\n\u003cdiv class=\"group TyagGW_tableWrapper flex flex-col-reverse w-fit\" tabindex=\"-1\"\u003e\n\u003ctable data-start=\"2112\" data-end=\"2752\" class=\"w-fit min-w-(--thread-content-width)\"\u003e\n\u003cthead data-start=\"2112\" data-end=\"2171\"\u003e\n\u003ctr data-start=\"2112\" data-end=\"2171\"\u003e\n\u003cth data-start=\"2112\" data-end=\"2135\" data-col-size=\"sm\" class=\"\"\u003eSpecification\u003c\/th\u003e\n\u003cth data-start=\"2135\" data-end=\"2171\" data-col-size=\"sm\" class=\"\"\u003eDetails\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003c\/thead\u003e\n\u003ctbody data-start=\"2231\" data-end=\"2752\"\u003e\n\u003ctr data-start=\"2231\" data-end=\"2288\"\u003e\n\u003ctd data-start=\"2231\" data-end=\"2253\" data-col-size=\"sm\"\u003eBrand\u003c\/td\u003e\n\u003ctd data-start=\"2253\" data-end=\"2288\" data-col-size=\"sm\"\u003eSEI Marine\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2289\" data-end=\"2346\"\u003e\n\u003ctd data-start=\"2289\" data-end=\"2311\" data-col-size=\"sm\"\u003eModel\u003c\/td\u003e\n\u003ctd data-start=\"2311\" data-end=\"2346\" data-col-size=\"sm\"\u003eSE221\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2347\" data-end=\"2404\"\u003e\n\u003ctd data-start=\"2347\" data-end=\"2369\" data-col-size=\"sm\"\u003ePrice\u003c\/td\u003e\n\u003ctd data-start=\"2369\" data-end=\"2404\" data-col-size=\"sm\"\u003e$1,645.00\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2405\" data-end=\"2462\"\u003e\n\u003ctd data-start=\"2405\" data-end=\"2427\" data-col-size=\"sm\"\u003eEngine Compatibility\u003c\/td\u003e\n\u003ctd data-start=\"2427\" data-end=\"2462\" data-col-size=\"sm\"\u003e3.0L V6, 2.6L I6, 1.7L I4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2463\" data-end=\"2520\"\u003e\n\u003ctd data-start=\"2463\" data-end=\"2485\" data-col-size=\"sm\"\u003eGear Ratios\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2485\" data-end=\"2520\"\u003e1.62, 1.75\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2521\" data-end=\"2578\"\u003e\n\u003ctd data-start=\"2521\" data-end=\"2543\" data-col-size=\"sm\"\u003eRotation\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2543\" data-end=\"2578\"\u003eStandard\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2579\" data-end=\"2636\"\u003e\n\u003ctd data-start=\"2579\" data-end=\"2601\" data-col-size=\"sm\"\u003eShaft Lengths\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2601\" data-end=\"2636\"\u003e20\", 25\", 30\", Stub Shaft\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2637\" data-end=\"2694\"\u003e\n\u003ctd data-start=\"2637\" data-end=\"2659\" data-col-size=\"sm\"\u003eSplines\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2659\" data-end=\"2694\"\u003e13 spline \/ 20 spline options\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr data-start=\"2695\" data-end=\"2752\"\u003e\n\u003ctd data-start=\"2695\" data-end=\"2717\" data-col-size=\"sm\"\u003eStroke Type\u003c\/td\u003e\n\u003ctd data-col-size=\"sm\" data-start=\"2717\" data-end=\"2752\"\u003e2-Stroke \u0026amp; 4-Stroke\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003chr data-start=\"2754\" data-end=\"2757\"\u003e\n\u003ch2 data-section-id=\"1cnlbrc\" data-start=\"2759\" data-end=\"2783\"\u003eCompatibility Notes\u003c\/h2\u003e\n\u003cul data-start=\"2785\" data-end=\"3125\"\u003e\n\u003cli data-section-id=\"157v6th\" data-start=\"2785\" data-end=\"2995\"\u003e\n\u003cp data-start=\"2787\" data-end=\"2827\"\u003eFits select Mercury engines including:\u003c\/p\u003e\n\u003cul data-start=\"2830\" data-end=\"2995\"\u003e\n\u003cli data-section-id=\"83fnwb\" data-start=\"2830\" data-end=\"2879\"\u003e\n\u003cp data-start=\"2832\" data-end=\"2879\"\u003e\u003cstrong data-start=\"2832\" data-end=\"2854\"\u003e3.0L V6 (2-Stroke)\u003c\/strong\u003e – 13 spline driveshaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1isvz6t\" data-start=\"2882\" data-end=\"2937\"\u003e\n\u003cp data-start=\"2884\" data-end=\"2937\"\u003e\u003cstrong data-start=\"2884\" data-end=\"2912\"\u003e2.6L Inline 6 (4-Stroke)\u003c\/strong\u003e – 20 spline driveshaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1ma5plx\" data-start=\"2940\" data-end=\"2995\"\u003e\n\u003cp data-start=\"2942\" data-end=\"2995\"\u003e\u003cstrong data-start=\"2942\" data-end=\"2970\"\u003e1.7L Inline 4 (4-Stroke)\u003c\/strong\u003e – 20 spline driveshaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"3rovg8\" data-start=\"2997\" data-end=\"3053\"\u003e\n\u003cp data-start=\"2999\" data-end=\"3053\"\u003eDesigned for engines within \u003cstrong data-start=\"3027\" data-end=\"3051\"\u003e135HP to 300HP range\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"iapdbg\" data-start=\"3054\" data-end=\"3125\"\u003e\n\u003cp data-start=\"3056\" data-end=\"3125\"\u003eAlways verify shaft length, spline count, and ratio before purchase\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3127\" data-end=\"3130\"\u003e\n\u003ch2 data-section-id=\"17vpvk1\" data-start=\"3132\" data-end=\"3156\"\u003eVariant Explanation\u003c\/h2\u003e\n\u003cp data-start=\"3158\" data-end=\"3211\"\u003eChoose the correct option based on your engine setup:\u003c\/p\u003e\n\u003cul data-start=\"3213\" data-end=\"3584\"\u003e\n\u003cli data-section-id=\"qob0iq\" data-start=\"3213\" data-end=\"3278\"\u003e\n\u003cp data-start=\"3215\" data-end=\"3278\"\u003e\u003cstrong data-start=\"3215\" data-end=\"3241\"\u003e13\/1.75\/3.0L\/20\" Shaft\u003c\/strong\u003e → 3.0L V6, 2-stroke, 20-inch shaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"yibwpx\" data-start=\"3279\" data-end=\"3334\"\u003e\n\u003cp data-start=\"3281\" data-end=\"3334\"\u003e\u003cstrong data-start=\"3281\" data-end=\"3307\"\u003e13\/1.75\/3.0L\/25\" Shaft\u003c\/strong\u003e → 3.0L V6, 25-inch shaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"qbr1id\" data-start=\"3335\" data-end=\"3390\"\u003e\n\u003cp data-start=\"3337\" data-end=\"3390\"\u003e\u003cstrong data-start=\"3337\" data-end=\"3363\"\u003e13\/1.75\/3.0L\/30\" Shaft\u003c\/strong\u003e → 3.0L V6, 30-inch shaft\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1cbq3r0\" data-start=\"3391\" data-end=\"3447\"\u003e\n\u003cp data-start=\"3393\" data-end=\"3447\"\u003e\u003cstrong data-start=\"3393\" data-end=\"3419\"\u003e20\/1.75\/2.6L\/20\" Shaft\u003c\/strong\u003e → 2.6L inline 6, 4-stroke\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1jb4m7x\" data-start=\"3448\" data-end=\"3516\"\u003e\n\u003cp data-start=\"3450\" data-end=\"3516\"\u003e\u003cstrong data-start=\"3450\" data-end=\"3476\"\u003e20\/1.85\/2.6L\/25\" Shaft\u003c\/strong\u003e → Higher ratio for torque performance\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1miu9mm\" data-start=\"3517\" data-end=\"3584\"\u003e\n\u003cp data-start=\"3519\" data-end=\"3584\"\u003e\u003cstrong data-start=\"3519\" data-end=\"3545\"\u003e20\/2.08\/1.7L\/25\" Shaft\u003c\/strong\u003e → Inline 4 setup for smaller engines\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp data-start=\"3586\" data-end=\"3636\"\u003e(Always match spline count + ratio + shaft length)\u003c\/p\u003e\n\u003chr data-start=\"3638\" data-end=\"3641\"\u003e\n\u003ch2 data-section-id=\"14m3ipp\" data-start=\"3643\" data-end=\"3663\"\u003eWhat’s Included\u003c\/h2\u003e\n\u003cul data-start=\"3665\" data-end=\"3809\"\u003e\n\u003cli data-section-id=\"nqwvtq\" data-start=\"3665\" data-end=\"3708\"\u003e\n\u003cp data-start=\"3667\" data-end=\"3708\"\u003eComplete lower unit (gearcase assembly)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"19w7zs7\" data-start=\"3709\" data-end=\"3741\"\u003e\n\u003cp data-start=\"3711\" data-end=\"3741\"\u003ePre-installed internal gears\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"d8k10l\" data-start=\"3742\" data-end=\"3783\"\u003e\n\u003cp data-start=\"3744\" data-end=\"3783\"\u003eWater pump housing (where applicable)\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"uvqzy7\" data-start=\"3784\" data-end=\"3809\"\u003e\n\u003cp data-start=\"3786\" data-end=\"3809\"\u003eReady-to-install unit\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"3811\" data-end=\"3814\"\u003e\n\u003ch2 data-section-id=\"pbmjzg\" data-start=\"3816\" data-end=\"3849\"\u003eImportant Notes \/ Disclaimer\u003c\/h2\u003e\n\u003cul data-start=\"3851\" data-end=\"4099\"\u003e\n\u003cli data-section-id=\"fugc9q\" data-start=\"3851\" data-end=\"3924\"\u003e\n\u003cp data-start=\"3853\" data-end=\"3924\"\u003eNot compatible with all Mercury models—verify fitment before ordering\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1t3edd8\" data-start=\"3925\" data-end=\"3966\"\u003e\n\u003cp data-start=\"3927\" data-end=\"3966\"\u003eDoes \u003cstrong data-start=\"3932\" data-end=\"3964\"\u003eNOT fit Verado V6\/V8 engines\u003c\/strong\u003e\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1g9b5ii\" data-start=\"3967\" data-end=\"4008\"\u003e\n\u003cp data-start=\"3969\" data-end=\"4008\"\u003eProfessional installation recommended\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"1gjazln\" data-start=\"4009\" data-end=\"4048\"\u003e\n\u003cp data-start=\"4011\" data-end=\"4048\"\u003eOil may need to be added before use\u003c\/p\u003e\n\u003c\/li\u003e\n\u003cli data-section-id=\"ylv12e\" data-start=\"4049\" data-end=\"4099\"\u003e\n\u003cp data-start=\"4051\" data-end=\"4099\"\u003eSerial number verification is strongly advised\u003c\/p\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"4101\" data-end=\"4104\"\u003e","brand":"Mercury","offers":[{"title":"13\/1.75\/3.0L 2-Stroke\/20\" Shaft","offer_id":47854674641155,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"13\/1.75\/3.0L 2-Stroke\/25\" Shaft","offer_id":47854674673923,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"13\/1.75\/3.0L 2-Stroke\/30\" Shaft","offer_id":47854674706691,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.75\/2.6L 4-Stroke\/20\" Shaft","offer_id":47854674739459,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.75\/2.6L 4-Stroke\/25\" Shaft","offer_id":47854674772227,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.75\/2.6L 4-Stroke\/30\" Shaft","offer_id":47854674804995,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.85\/2.6L 4-Stroke\/20\" Shaft","offer_id":47854674837763,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.85\/2.6L 4-Stroke\/25\" Shaft","offer_id":47854674870531,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/1.85\/2.6L 4-Stroke\/30\" Shaft","offer_id":47854674903299,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/2.08\/1.7L 4-Stroke\/20\" Shaft","offer_id":47854674936067,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true},{"title":"20\/2.08\/1.7L 4-Stroke\/25\" Shaft","offer_id":47854674968835,"sku":"ST-90-221","price":1645.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0808\/2613\/8883\/files\/SEI-SE-221.jpg?v=1773890581","url":"https:\/\/allmarinesuppliers.com\/products\/mercury-se221-lower-unit-1-75-1-62","provider":"All Marine Suppliers","version":"1.0","type":"link"}