{"product_id":"sierra-18-3206-shaft-seal-for-omc-sterndrive-i-o-1972-1986-replaces-omc-907774-except-cobra","title":"Sierra 18-3206 Water Pump Housing - Replaces OMC 907774 - I\/O Stern Drives 1972-86, Except Cobra","description":"\u003cp\u003eThe Sierra 18-3206 is a water pump housing built for I\/O stern drive cooling systems covering the 1972-86 model span, except OMC Cobra units, which use a different housing. The water pump housing is the structural body that seats the impeller and directs raw water flow through the drive's cooling circuit, so a cracked, worn, or corroded housing is a common cause of overheating and reduced water flow on affected stern drives. This housing replaces OEM number 907774 and is sold as a single unit per package.\u003c\/p\u003e\u003cp\u003eBecause fitment on OMC-based stern drives is model-specific, buyers should confirm their drive is not a Cobra unit before ordering the 18-3206 - Cobra applications use a different Sierra part number. Installing the correct housing restores proper impeller seating and water passage geometry for reliable cooling performance.\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 18-3206\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Housing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 907774\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e I\/O stern drives, 1972-86, except Cobra models\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.35 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282113032\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Quantity:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eI\/O stern drives, 1972-86, except Cobra models\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e907774\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3206 water pump housing fit?\u003c\/strong\u003e The Sierra 18-3206 fits I\/O stern drives from 1972-86, except OMC Cobra models, which require a different housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3206 fit an OMC Cobra stern drive?\u003c\/strong\u003e No. The Sierra 18-3206 water pump housing is specifically excluded from Cobra applications; Cobra stern drives use a separate housing part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-3206 replace?\u003c\/strong\u003e It replaces OEM number 907774 on applicable I\/O stern drives, 1972-86, except Cobra models.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3206 water pump housing weigh?\u003c\/strong\u003e 0.35 pounds is the weight of the Sierra 18-3206 water pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many water pump housings are included when I order 18-3206?\u003c\/strong\u003e One water pump housing ships per package under Sierra part number 18-3206.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3206 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-3206 water pump housing is backed by Sierra's limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-3206 water pump housing?\u003c\/strong\u003e The UPC for the Sierra 18-3206 is 808282113032.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat role does the 18-3206 housing play in the cooling system?\u003c\/strong\u003e As the water pump housing, the 18-3206 holds the impeller and directs raw water through the I\/O stern drive's cooling circuit; a worn or damaged housing can cause overheating or reduced coolant flow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3206 an OEM part or an aftermarket replacement?\u003c\/strong\u003e The 18-3206 is a Sierra-manufactured replacement housing built to meet or exceed the specifications of the original OEM housing it replaces, OEM 907774.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-3206 and a Cobra water pump housing like the 18-4833?\u003c\/strong\u003e The Sierra 18-3206 fits I\/O stern drives from 1972-86 except Cobra, while a part such as 18-4833 is built for OMC Cobra lower units (1986-93) without a cone clutch; these are different SKUs, so confirm which drive you have before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3206 fit any I\/O stern drive built between 1972 and 1986?\u003c\/strong\u003e It fits I\/O stern drives in that 1972-86 range with the exception of OMC Cobra models, which are excluded from this housing's fitment.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988141322459,"sku":"SIE-18-3206","price":33.53,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3206_lg__18022.1558126416.500.750.jpg?v=1785188755","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3206-shaft-seal-for-omc-sterndrive-i-o-1972-1986-replaces-omc-907774-except-cobra","provider":"Good Vibes Marina","version":"1.0","type":"link"}