{"product_id":"water-pump-o-ring-for-mercury-outboards-sierra-18-7143-9-water-pump-kit-seal-replacing-395073-388644-pack-of-5","title":"Sierra O-Ring 18-7143-9 for OMC Sterndrive\/Cobra I\/O Transom Mount, 2.3-7.5 HP (1986-90), Pack of 5","description":"\u003cp\u003eThe Sierra 18-7143-9 is a transom mount O-ring built for OMC Sterndrive\/Cobra I\/O units rated 2.3 to 7.5 HP, covering the 1986-90 model years. It is sold priced per package, with 5 O-rings included in each package, so you have enough on hand to reseal the transom mount area during service or a rebuild without having to reorder for a second job. Sierra also offers this O-ring under part number 18-7143 when purchased priced per piece; the -9 suffix designates the package-of-5 pricing and packaging. As a transom mount seal, this O-ring plays a role in maintaining a watertight barrier at the sterndrive-to-transom interface, an area that is routinely disturbed during outdrive removal, gimbal ring service, or bellows replacement. Keeping this seal in good condition and replacing it whenever the transom assembly is opened up helps prevent water intrusion into the boat.\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 18-7143-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePosition:\u003c\/strong\u003e Transom Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e OMC Sterndrive\/Cobra I\/O\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Range:\u003c\/strong\u003e 2.3 - 7.5 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years:\u003c\/strong\u003e 1986-90\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackaging:\u003c\/strong\u003e Pack of 5\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282165222\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eOMC Sterndrive\/Cobra I\/O, 2.3 - 7.5 HP, 1986-90, Transom Mount\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-7143-9 O-ring fit?\u003c\/strong\u003e It fits OMC Sterndrive\/Cobra I\/O engines rated 2.3 to 7.5 HP, model years 1986-90, at the transom mount position.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many O-rings are included in one package of the 18-7143-9?\u003c\/strong\u003e The Sierra 18-7143-9 is priced per package and includes 5 O-rings.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a single-piece version of this O-ring?\u003c\/strong\u003e Yes, Sierra part number 18-7143 is the same O-ring priced per piece; the 18-7143-9 designates the package of 5.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-7143-9 O-ring package weigh?\u003c\/strong\u003e The package weighs 0.02 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the sterndrive does this O-ring install?\u003c\/strong\u003e This O-ring installs at the transom mount on OMC Sterndrive\/Cobra I\/O units.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat horsepower range is this O-ring designed for?\u003c\/strong\u003e It is designed for OMC Sterndrive\/Cobra I\/O units in the 2.3 to 7.5 HP range.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model years does the Sierra 18-7143-9 cover?\u003c\/strong\u003e The listed fitment for the 18-7143-9 is the 1986-90 model years.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-7143-9 sold as a single O-ring or a set?\u003c\/strong\u003e It is sold as a set, priced per package of 5 O-rings, not as a single piece.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-7143-9?\u003c\/strong\u003e The UPC is 808282165222.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-7143-9 an OMC O-ring or an OMC Cobra O-ring?\u003c\/strong\u003e It is listed for OMC Sterndrive\/Cobra I\/O units, covering the Cobra sterndrive line at the transom mount.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988364701915,"sku":"SIE-18-7143-9","price":8.05,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-7143-9__13059.1737866661.500.750.jpg?v=1785329171","url":"https:\/\/www.goodvibesmarina.com\/products\/water-pump-o-ring-for-mercury-outboards-sierra-18-7143-9-water-pump-kit-seal-replacing-395073-388644-pack-of-5","provider":"Good Vibes Marina","version":"1.0","type":"link"}