{"product_id":"sierra-18-3448-water-pump-kit-for-mercury-20-hp-1967-1980-outboards-replaces-oem-46-48744a3","title":"Sierra 18-3448 Water Pump Kit, Replaces Mercury 46-48744A3, Fits 20 HP Outboards 1967-80","description":"\u003cp\u003eThe Sierra 18-3448 Water Pump Kit is a complete outboard water pump rebuild kit designed for 20 HP outboard motors from 1967-80. This kit replaces the OEM Mercury part number 46-48744A3 and restores proper cooling system function to an aging or worn water pump assembly. Weak or failing water pump components are a common cause of overheating in older outboards, and this kit provides the core parts needed to bring the pump back to factory-correct operation in a single service.\u003c\/p\u003e\u003cp\u003eInside the kit, boaters get the impeller, the wear item that actually pumps raw water through the cooling passages, along with the upper face plate gasket and other pump housing gaskets needed to reseal the assembly during reinstallation. The impeller and gaskets are manufactured to Sierra's standard specifications so the rebuilt pump seals and pumps correctly without leaks or premature wear. The kit is built from metal and rubber components sized specifically for this pump housing, so no additional fabrication or modification is needed during the rebuild.\u003c\/p\u003e\u003cp\u003eThis kit is intended for outboard owners and marine technicians performing a routine water pump service or repair on a 20 HP outboard covered by this application. Because the impeller is a rubber wear part, it is good practice to replace it any time the lower unit is opened for other service, even if the old impeller looks intact.\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 18-3448\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Water Pump Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eReplaces (OEM):\u003c\/strong\u003e 46-48744A3\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Mercury 20 HP outboards, 1967-80\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.66 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1 kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eKit Contents:\u003c\/strong\u003e Impeller (18-3052, O.E. 47-89982), Upper Face Plate Gasket (18-2827, O.E. 27-39623), Lower Water Pump Gasket (18-2828), Water Pump Gasket (18-2829)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eMercury 20 HP outboards, 1967-80\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e46-48744A3\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3448 Water Pump Kit fit?\u003c\/strong\u003e The Sierra 18-3448 Water Pump Kit fits Mercury 20 HP outboards built from 1967 to 1980.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3448 a direct replacement for Mercury 46-48744A3?\u003c\/strong\u003e Yes, the Sierra 18-3448 Water Pump Kit replaces Mercury part number 46-48744A3 and is built to fit the same 20 HP outboard water pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat parts are included in the 18-3448 kit?\u003c\/strong\u003e The kit contains an impeller (Sierra 18-3052, O.E. 47-89982), an upper face plate gasket (Sierra 18-2827, O.E. 27-39623), a lower water pump gasket (18-2828), and a water pump gasket (18-2829).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3448 Water Pump Kit weigh?\u003c\/strong\u003e The Sierra 18-3448 Water Pump Kit weighs 0.66 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the impeller in this kit made from?\u003c\/strong\u003e The components in the Sierra 18-3448 Water Pump Kit, including the impeller, are made from metal and rubber materials sized for the 20 HP outboard water pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need to replace the impeller even if it still looks fine?\u003c\/strong\u003e Yes, since the impeller included in the Sierra 18-3448 kit is a rubber wear part, it is best practice to replace it whenever the water pump housing is opened for service, regardless of its visual condition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit fix an overheating 20 HP Mercury outboard?\u003c\/strong\u003e A worn impeller or damaged pump gaskets are a common cause of outboard overheating, and the Sierra 18-3448 Water Pump Kit provides the impeller and gaskets needed to restore proper cooling pump function on the 20 HP Mercury application it covers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3448 kit genuine Sierra or aftermarket?\u003c\/strong\u003e The 18-3448 Water Pump Kit is manufactured by Sierra as a direct-fit replacement kit for the Mercury 46-48744A3 water pump on 20 HP outboards from 1967-80.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the kit include the gasket for the water pump housing?\u003c\/strong\u003e Yes, the Sierra 18-3448 kit includes the upper face plate gasket, lower water pump gasket, and water pump gasket needed to reseal the housing along with the impeller.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM cross-reference number for this water pump kit?\u003c\/strong\u003e The Sierra 18-3448 Water Pump Kit cross-references to Mercury OEM part number 46-48744A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the Sierra 18-3448 kit myself?\u003c\/strong\u003e The Sierra 18-3448 Water Pump Kit contains the impeller and gaskets needed for a standard water pump rebuild on a 20 HP outboard, a job commonly performed by boat owners and marine technicians during routine lower unit service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many units come in one Sierra 18-3448 kit?\u003c\/strong\u003e One Sierra 18-3448 Water Pump Kit contains a single set of the impeller and gaskets listed for the 20 HP Mercury outboard application.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148990171,"sku":"SIE-18-3448","price":103.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__69643.1753840679.500.750.jpg?v=1785189066","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3448-water-pump-kit-for-mercury-20-hp-1967-1980-outboards-replaces-oem-46-48744a3","provider":"Good Vibes Marina","version":"1.0","type":"link"}