{"product_id":"merc-547","title":"Mercury MerCruiser Blackhawk Lower Gear Retainer Nut 805070","description":"\u003cp\u003eMercury MerCruiser 805070 is a genuine OEM \u003cstrong\u003eretainer nut\u003c\/strong\u003e used in the \u003cstrong\u003elower gears and components\u003c\/strong\u003e assembly of the \u003cstrong\u003eMerCruiser Blackhawk\u003c\/strong\u003e stern drive. Current Mercury dealer references show \u003cstrong\u003e805070\u003c\/strong\u003e superseded to \u003cstrong\u003e805538\u003c\/strong\u003e, the functional replacement part number.\u003c\/p\u003e\n\u003ch2\u003eKey Features\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eGenuine Mercury Marine OEM part number \u003cstrong\u003e805070\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eSuperseded to current replacement part number \u003cstrong\u003e805538\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli\u003eUsed as the \u003cstrong\u003eretainer nut\u003c\/strong\u003e in the \u003cstrong\u003elower gears and components\u003c\/strong\u003e section.\u003c\/li\u003e\n\u003cli\u003eCurrent dealer shipping specs for \u003cstrong\u003e805070\u003c\/strong\u003e are approximately \u003cstrong\u003e0.14 lb\u003c\/strong\u003e, \u003cstrong\u003e2.25 in. x 2.25 in. x 0.25 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eCurrent dealer shipping specs for \u003cstrong\u003e805538\u003c\/strong\u003e are approximately \u003cstrong\u003e0.23 lb\u003c\/strong\u003e, \u003cstrong\u003e2.50 in. x 2.50 in. x 0.50 in.\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003eEngine Compatibility\u003c\/h2\u003e\n\u003cp\u003eThe strongest supportable fitment for 805070 is the \u003cstrong\u003eMerCruiser Blackhawk stern drive\u003c\/strong\u003e in the \u003cstrong\u003elower gears and components\u003c\/strong\u003e assembly. Current OEM-style diagram references place the replacement \u003cstrong\u003e805538\u003c\/strong\u003e in that Blackhawk lower-gear layout with the surrounding driveshaft, coupling, bearing, thrust bearing, and propeller shaft parts.\u003c\/p\u003e\n\u003ch2\u003eSerial Number Fitment Notice\u003c\/h2\u003e\n\u003cp\u003eVerify fitment by exact \u003cstrong\u003edrive model\u003c\/strong\u003e, \u003cstrong\u003eserial number\u003c\/strong\u003e, and the correct \u003cstrong\u003elower gears and components\u003c\/strong\u003e diagram before ordering. For 805070, the safest match is the specific Blackhawk lower-unit assembly location rather than the part name alone.\u003c\/p\u003e\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cp\u003eReplace this retainer nut when the original is damaged, worn, corroded, distorted, or removed during lower-unit service and no longer suitable for reuse. Because it is part of the lower-gear retaining stack, correct condition and exact fit matter during gearcase reassembly. This is a practical service inference based on its documented placement in the Blackhawk lower-gears assembly.\u003c\/p\u003e\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cp\u003eInstall this part only after confirming the correct Blackhawk parts diagram for the drive being serviced. Current diagram references show the replacement \u003cstrong\u003e805538\u003c\/strong\u003e used with related parts such as \u003cstrong\u003ewasher 805068\u003c\/strong\u003e, \u003cstrong\u003edriveshaft assembly 805067A1\u003c\/strong\u003e, \u003cstrong\u003ebearing assembly 36387A1 \/ 8M0146566\u003c\/strong\u003e, \u003cstrong\u003ecoupling assembly 88243A3\u003c\/strong\u003e, and \u003cstrong\u003einner propeller shaft 805073T \/ 865322T\u003c\/strong\u003e in the same lower-gear service area.\u003c\/p\u003e\n\u003ch2\u003eAlternate\/Superseded Part Numbers\u003c\/h2\u003e\n\u003cp\u003eCurrent Mercury dealer references show \u003cstrong\u003e805538\u003c\/strong\u003e as the superseding replacement for \u003cstrong\u003e805070\u003c\/strong\u003e.\u003c\/p\u003e\n\u003ch2\u003eParts Desk Insight\u003c\/h2\u003e\n\u003cp\u003eFor lower-unit hardware like this, the exact \u003cstrong\u003edrive family and diagram position\u003c\/strong\u003e matter more than the nut description. Matching the retainer nut to the Blackhawk lower-gear breakdown is the best way to avoid ordering the wrong hardware for the assembly.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eShipping:\u003c\/strong\u003e Ships same or next day for fast Canada wide shipping. ⚓\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563872845860,"sku":"805070","price":50.9,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/e32a1c35-45f8-47a1-a93d-36b5f11733d7.png?v=1776968436","url":"https:\/\/marisolmarine.com\/products\/merc-547","provider":"Marisol Marine Company","version":"1.0","type":"link"}