{"product_id":"sierra-18-3414-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-96146a5","title":"Sierra 18-3414 Water Pump Base for Mercury\/Mariner Outboard Motors - Replaces 46-77516A1","description":"\u003cp\u003eThe Sierra 18-3414 is a water pump base built for Mercury\/Mariner outboard motors, designed to meet or exceed original equipment quality. The water pump base is a core structural component of the outboard's cooling system, forming the housing that the impeller and related water pump components mount into and seal against. A properly fitted water pump base ensures the impeller can maintain the seal and pressure needed to draw raw water through the powerhead cooling passages, so replacing a cracked, worn, or corroded base restores reliable water flow and helps protect the engine from overheating.\u003c\/p\u003e\u003cp\u003eSierra manufactures this base as a direct cross-reference to several Mercury OEM part numbers, making it straightforward to identify as the correct replacement when servicing Mercury\/Mariner outboards that originally used any of those OEM numbers. At 0.21 pounds, it is a compact, precision-made component intended to be installed alongside the impeller and related water pump hardware during a cooling system service or rebuild.\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 18-3414\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Water Pump Base\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315885\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e Mercury\/Mariner outboard motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference:\u003c\/strong\u003e 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, 46-48745A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury\/Mariner outboard motor\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e46-77516A1\u003c\/li\u003e\n\u003cli\u003e46-73842A2\u003c\/li\u003e\n\u003cli\u003e46-68390A1\u003c\/li\u003e\n\u003cli\u003e46-65498A1\u003c\/li\u003e\n\u003cli\u003e46-48745A1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3414 water pump base used for?\u003c\/strong\u003e It is the water pump base for Mercury\/Mariner outboard motor cooling systems, the housing component that the impeller and water pump assembly mount into to draw and seal raw water for engine cooling.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich Mercury outboard motors does part 18-3414 fit?\u003c\/strong\u003e The Sierra 18-3414 water pump base is built for Mercury\/Mariner outboard motors that use any of its cross-referenced Mercury OEM part numbers: 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, or 46-48745A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs Sierra 18-3414 the same as Mercury 46-77516A1?\u003c\/strong\u003e Yes, the Sierra 18-3414 water pump base cross-references directly to Mercury OEM part numbers 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, and 46-48745A1, so it is an equivalent replacement for any of those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3414 water pump base weigh?\u003c\/strong\u003e The Sierra 18-3414 water pump base weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3414 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3414 is the water pump base only; the impeller and drain gasket are separate components sold under their own part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-3414 replace?\u003c\/strong\u003e It replaces Mercury OEM numbers 46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, and 46-48745A1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3414 an aftermarket or genuine Mercury part?\u003c\/strong\u003e The Sierra 18-3414 is an aftermarket water pump base manufactured to meet or exceed original equipment quality, offered as a cross-reference replacement for the listed Mercury OEM part numbers rather than a Mercury-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm the 18-3414 is the correct water pump base for my outboard?\u003c\/strong\u003e Check the OEM number stamped on your existing water pump base against the cross-reference list for Sierra 18-3414 (46-77516A1, 46-73842A2, 46-68390A1, 46-65498A1, 46-48745A1); a match confirms fit is specific to those numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat UPC is associated with the Sierra 18-3414 water pump base?\u003c\/strong\u003e The UPC for the Sierra 18-3414 water pump base is 030999315885.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy would I need to replace a water pump base on my outboard motor?\u003c\/strong\u003e A cracked, worn, or corroded water pump base can prevent the impeller from sealing properly, reducing raw water flow to the cooling system; replacing it with the Sierra 18-3414 restores the sealing surface needed for reliable cooling.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148170971,"sku":"SIE-18-3414","price":41.62,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3414_lg__69173.1558125764.500.750.jpg?v=1785188970","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3414-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-96146a5","provider":"Good Vibes Marina","version":"1.0","type":"link"}