{"product_id":"sierra-18-3419-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-42579a3","title":"Sierra 18-3419 Water Pump Base for Mercury\/Mariner Outboard Motors, Replaces Mercury 46-42579A3","description":"\u003cp\u003eThe Sierra 18-3419 Water Pump Base is a replacement component for the water pump housing assembly on Mercury and Mariner outboard motors. Built from aluminum, this base is designed to meet or exceed original equipment quality, giving boaters a durable, direct-fit foundation for the water pump impeller assembly that keeps the outboard's cooling system operating correctly. The water pump base is a wear item in the outboard's raw-water cooling circuit, and replacing it along with the impeller and related wear components during routine water pump service helps ensure consistent water flow to the engine.\u003c\/p\u003e\u003cp\u003eThis part is fit specific, so buyers should confirm the part number against their existing water pump base before ordering to ensure proper fit. The Sierra 18-3419 is manufactured to be interchangeable with the corresponding Mercury Marine OEM water pump base, making it a straightforward replacement option for outboard owners performing their own water pump maintenance.\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 18-3419\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.21 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFor Mercury and Mariner outboard motors. Fit specific; check part numbers against your existing water pump base to ensure proper fit.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12360\u003c\/li\u003e\n\u003cli\u003eMallory 9-43307\u003c\/li\u003e\n\u003cli\u003eMercury 46-42579A3\u003c\/li\u003e\n\u003cli\u003e46-8M0077147\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3419 Water Pump Base used for?\u003c\/strong\u003e It is the water pump base component of the water pump housing assembly on Mercury and Mariner outboard motors, providing the mounting foundation for the impeller assembly in the engine's raw-water cooling system.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-3419 fit my Mercury outboard?\u003c\/strong\u003e The Sierra 18-3419 is designed for Mercury and Mariner outboard motors, but it is fit specific, so you should check part numbers against your existing water pump base before ordering to confirm proper fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3419 the same as Mercury part 46-42579A3?\u003c\/strong\u003e Yes, the Sierra 18-3419 Water Pump Base is interchangeable with Mercury Marine OEM part number 46-42579A3.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other part numbers cross-reference to the Sierra 18-3419?\u003c\/strong\u003e The Sierra 18-3419 is interchangeable with GLM 12360, Mallory 9-43307, Mercury 46-42579A3, and 46-8M0077147.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-3419 Water Pump Base made from?\u003c\/strong\u003e This water pump base is made from aluminum.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3419 Water Pump Base weigh?\u003c\/strong\u003e The Sierra 18-3419 weighs 0.21 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3419 a genuine Mercury part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-3419 is an aftermarket water pump base manufactured by Sierra to meet or exceed original equipment quality, built to be interchangeable with the equivalent Mercury Marine OEM part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3419 come with the impeller included?\u003c\/strong\u003e No, the Sierra 18-3419 is the water pump base only; it does not include the impeller or other water pump kit components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should the water pump base be replaced on an outboard?\u003c\/strong\u003e The water pump base is typically inspected and replaced during routine water pump service along with the impeller and other wear components to maintain proper cooling system performance.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy is fit verification important before ordering the Sierra 18-3419?\u003c\/strong\u003e Because water pump bases are fit specific across different Mercury and Mariner outboard models, confirming the part number against your existing base before ordering the Sierra 18-3419 helps ensure you receive a properly fitting replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988148269275,"sku":"SIE-18-3419","price":24.66,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3419_lg__54457.1558125960.500.750.jpg?v=1785188116","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3419-water-pump-base-for-mercury-mariner-outboards-replaces-oem-46-42579a3","provider":"Good Vibes Marina","version":"1.0","type":"link"}