{"product_id":"sierra-18-3039-water-pump-impeller-for-mercury-outboards-replaces-oem-47-89981-456-id","title":"Sierra Impeller 18-3039, Replaces Mercury Marine 47-89981","description":"\u003cp\u003eThe Sierra 18-3039 is a replacement water pump impeller designed to restore proper cooling flow in marine engines that use the Mercury Marine 47-89981 impeller. The impeller is the core wear component inside a water pump housing, drawing raw water through the pump and circulating it through the engine's cooling passages to prevent overheating. Over time, impeller vanes lose flexibility, crack, or wear down, reducing pump output and putting the engine at risk of running hot. Replacing a worn impeller with the Sierra 18-3039 restores the pump's ability to move water at the correct rate.\u003c\/p\u003e\u003cp\u003eThis impeller ships as a single unit and is built to Sierra's standard fit and finish for marine water pump service. It is intended as a direct component replacement where the Mercury Marine 47-89981 impeller is specified, and is commonly installed during routine water pump maintenance or as part of a broader water pump 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 18-3039\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999237149\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e United States\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 47-89981\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications specifying the Mercury Marine 47-89981 impeller.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e47-89981\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3039 fit?\u003c\/strong\u003e The Sierra 18-3039 impeller is a direct replacement wherever the Mercury Marine 47-89981 impeller is specified.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3039 the same as the Mercury Marine 47-89981?\u003c\/strong\u003e Yes, the Sierra 18-3039 is a cross-reference equivalent to the Mercury Marine 47-89981 impeller.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many impellers come in the package?\u003c\/strong\u003e One impeller is included with part number 18-3039.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3039 impeller weigh?\u003c\/strong\u003e It weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-3039 impeller made?\u003c\/strong\u003e The country of origin listed for this impeller is the United States.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-3039 is a Sierra-branded impeller, sold as a cross-reference equivalent to the OEM Mercury Marine 47-89981 part rather than a Mercury-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for this part?\u003c\/strong\u003e The UPC for the Sierra 18-3039 impeller is 030999237149.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace this impeller?\u003c\/strong\u003e An impeller like the Sierra 18-3039 should be replaced when it shows cracked, torn, or stiffened vanes, or when engine cooling water flow drops, since a worn impeller reduces pump output.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3039 include the pump housing or just the impeller?\u003c\/strong\u003e This part number covers the impeller only; it does not include a pump housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use the 18-3039 as a routine maintenance replacement?\u003c\/strong\u003e Yes, the 18-3039 is suited for routine water pump maintenance wherever the Mercury Marine 47-89981 impeller is called for.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988136866011,"sku":"SIE-18-3039","price":13.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3039_lg__66572.1558126221.500.750.jpg?v=1785188046","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3039-water-pump-impeller-for-mercury-outboards-replaces-oem-47-89981-456-id","provider":"Good Vibes Marina","version":"1.0","type":"link"}