{"product_id":"sierra-18-1236-upper-gearcase-drain-screw-for-omc-cobra-evinrude-v-6-40-50hp-outboards-1989-1997-replaces-omc-336982","title":"Sierra 18-1236 Drain Screw, OEM 309243, for OMC Cobra V-6 40-50 HP Drives (1989-97)","description":"\u003cp\u003eThe Sierra 18-1236 is a gearcase drain screw machined from alloy steel with a machined finish for corrosion resistance and a clean, precise fit. It is designed as a direct equivalent to OMC part 309243, used to seal the drain\/fill port on the lower unit or drive housing during service. The screw uses a flat head with a Torx socket drive and a #6-40 fully-threaded, right-hand Unified National Coarse (UNC) shaft, compatible with a 0.25 inch groove diameter. Its compact 0.39 x 0.39 x 0.39 inch dimensions make it a small, easily overlooked but essential part to have on hand any time the gearcase is drained for an oil change or inspection.\u003c\/p\u003e\u003cp\u003eThis drain screw is intended for OMC Cobra drives and V-6 40-50 HP applications from 1989-97. A dedicated O-ring is used with the 18-1236 drain screw to complete the seal; the O-ring is a separate, individually sold component and is not included with this screw. Each unit is sold as a single drain screw.\u003c\/p\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Sierra\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer Part Number:\u003c\/strong\u003e 18-1236\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 309243\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHead Style:\u003c\/strong\u003e Flat\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive System:\u003c\/strong\u003e Torx\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Size:\u003c\/strong\u003e #6-40\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Style:\u003c\/strong\u003e Right Hand\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThread Coverage:\u003c\/strong\u003e Fully Threaded\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSet Screw Thread Type:\u003c\/strong\u003e Unified National Coarse (UNC)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Groove Diameter:\u003c\/strong\u003e 0.25 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNumber of Pieces:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.01 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC Cobra drives\u003c\/li\u003e\n\u003cli\u003eV-6 40-50 HP (1989-97)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC 309243\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-1236 drain screw fit?\u003c\/strong\u003e The Sierra 18-1236 drain screw is designed for OMC Cobra drives and V-6 40-50 HP applications from 1989-97.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the 18-1236 replace?\u003c\/strong\u003e It is a direct equivalent to OMC part number 309243.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-1236 a genuine Sierra part?\u003c\/strong\u003e Yes, 18-1236 is Sierra's own manufacturer part number for this drain screw, not a third-party knockoff.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the drain screw made of?\u003c\/strong\u003e The 18-1236 drain screw is machined from alloy steel with a machined finish for durability and corrosion resistance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat thread size does the 18-1236 use?\u003c\/strong\u003e It has a #6-40 thread that is fully threaded, right-hand, and Unified National Coarse (UNC).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat drive type does the screw head use?\u003c\/strong\u003e The 18-1236 has a flat head with a Torx socket drive.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the Sierra 18-1236 drain screw?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches and is compatible with a 0.25 inch groove diameter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1236 come with an O-ring?\u003c\/strong\u003e No, the O-ring used with the 18-1236 drain screw is sold separately as its own part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1236 drain screw weigh?\u003c\/strong\u003e It weighs 0.01 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many drain screws are included per order?\u003c\/strong\u003e Each Sierra 18-1236 order includes a single drain screw.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen would I need to replace this drain screw?\u003c\/strong\u003e The 18-1236 is typically replaced whenever the gearcase oil is drained and the screw or its O-ring shows wear, since a worn seal can allow oil to leak from the drive.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988087386331,"sku":"SIE-18-1236","price":7.74,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-1236_lg__89416.1558119460.500.750.jpg?v=1785188232","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1236-upper-gearcase-drain-screw-for-omc-cobra-evinrude-v-6-40-50hp-outboards-1989-1997-replaces-omc-336982","provider":"Good Vibes Marina","version":"1.0","type":"link"}