{"product_id":"sierra-18-3087-water-pump-impeller-for-mercruiser-engine-mounted-sea-water-pumps-1999-older-replaces-mercury-47-59362","title":"Sierra Impeller 18-3087 for MerCruiser Bravo and Inboard Water Pumps, Replaces Mercury Marine 47-59362","description":"\u003cp\u003eThe Sierra 18-3087 is a water pump impeller built for MerCruiser Bravo drives and inboard engines that use a plastic water pump body, covering units from serial number 3040411 and above. It is also referenced for MerCruiser engines with engine-mounted sea water pumps, 1999 and older. The impeller is the wear component inside the raw water pump that draws in and circulates outside water to cool the engine; as its blades flex and wear over time and pump temperature rises, cooling efficiency drops and the risk of overheating increases, so periodic replacement is standard maintenance for any engine-mounted marine cooling system.\u003c\/p\u003e\u003cp\u003eConstructed of a rubber or plastic material in a black finish, the 18-3087 is engineered as a direct fit for the plastic-body Bravo and inboard water pump housings it is listed for, and it carries the Mercury Marine 47-59362 and 47-59362T1 cross-reference numbers so it can be ordered as a like-for-like replacement in existing pump assemblies. Each unit ships as a single impeller for one water pump. Sierra parts are backed by the manufacturer's standard customer satisfaction warranty, giving boat owners and marine technicians a dependable option when servicing MerCruiser raw water cooling systems.\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 18-3087\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.43 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Rubber or Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Engine Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Use:\u003c\/strong\u003e For Fresh Water\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 impeller per unit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315397\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 47-59362, 47-59362T1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser Bravo drives and inboard engines with plastic water pump body, serial number 3040411 and above\u003c\/li\u003e\n\u003cli\u003eMerCruiser engines with engine-mounted sea water pumps, 1999 and older\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury Marine 47-59362\u003c\/li\u003e\n\u003cli\u003eMercury Marine 47-59362T1\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3087 impeller fit?\u003c\/strong\u003e The Sierra 18-3087 is built for MerCruiser Bravo drives and inboard engines with a plastic water pump body, serial number 3040411 and above, and it is also referenced for MerCruiser engines with engine-mounted sea water pumps, 1999 and older.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3087 a direct replacement for a Mercury Marine impeller?\u003c\/strong\u003e Yes, part number 18-3087 cross-references to Mercury Marine 47-59362 and 47-59362T1, so it installs as a like-for-like replacement in those pump assemblies.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-3087 replace?\u003c\/strong\u003e The 18-3087 impeller replaces Mercury Marine 47-59362 and 47-59362T1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-3087 impeller made from?\u003c\/strong\u003e It is made of a rubber or plastic material in a black finish, sized for the plastic-body water pump housings it is designed to fit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3087 impeller weigh?\u003c\/strong\u003e The Sierra 18-3087 impeller weighs 0.43 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many impellers come in one 18-3087 package?\u003c\/strong\u003e Each 18-3087 package contains one impeller for a single water pump.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3087 fit a water pump with a brass body?\u003c\/strong\u003e No, the 18-3087 is designated for MerCruiser Bravo and inboard water pumps with a plastic pump body; brass-body pumps use a different Sierra part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3087 a genuine Sierra part or a generic aftermarket copy?\u003c\/strong\u003e It is a genuine Sierra-branded impeller, sold under Sierra's own part number 18-3087 with Sierra's standard customer satisfaction warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the recommended use for the 18-3087 impeller?\u003c\/strong\u003e The 18-3087 is recommended for use in fresh water applications within its listed MerCruiser water pump fitment.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3087 come with installation gaskets?\u003c\/strong\u003e The 18-3087 listing covers the impeller only; the water pump housing gaskets used in the same MerCruiser cooling system service are separate parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my MerCruiser needs impeller 18-3087 versus a different Sierra impeller?\u003c\/strong\u003e Match your MerCruiser water pump body type and serial number to the Bravo\/inboard plastic-body pump range covered by 18-3087; units with a brass pump body or a different serial range use a different Sierra part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988139847899,"sku":"SIE-18-3087","price":23.64,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__25539.1771682386.500.750.jpg?v=1785188277","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3087-water-pump-impeller-for-mercruiser-engine-mounted-sea-water-pumps-1999-older-replaces-mercury-47-59362","provider":"Good Vibes Marina","version":"1.0","type":"link"}