{"product_id":"sierra-18-3083-water-pump-impeller-for-johnson-evinrude-omc-outboards-replaces-oem-377230-777213","title":"Sierra 18-3083 Impeller, OMC 377230 Replacement for Evinrude 40 HP (1960-70) and 50 HP (1971-78) Outboards","description":"\u003cp\u003eThe Sierra 18-3083 is a water pump impeller engineered for Evinrude outboard motors, designed to keep the engine's cooling system circulating water reliably. As a wear item inside the lower unit water pump, the impeller pushes raw water through the cooling passages to prevent overheating, and it should be inspected and replaced on a regular service interval or any time cooling performance drops off. This impeller is built from metal components and is finished in black. It is a direct application-specific part for Evinrude 40 HP outboards from 1960-70 and 50 HP outboards from 1971-78, and it cross-references to OMC part numbers 377230 and 777213, so it can be ordered as a drop-in equivalent using either the Sierra part number or the original OMC numbers. The impeller ships as a single unit and is the correct replacement for boaters who need to restore proper water flow to the engine's cooling system without hunting down a discontinued OEM part. Because engine overheating from a worn or cracked impeller can lead to serious damage, keeping a spare on hand or replacing it proactively during routine maintenance is common practice among outboard owners running these engine and year combinations.\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 18-3083\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Type:\u003c\/strong\u003e Impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Length:\u003c\/strong\u003e 5.588 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Width:\u003c\/strong\u003e 5.588 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Height:\u003c\/strong\u003e 3.81 cm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Engine Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Impeller\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Equivalent Part Number:\u003c\/strong\u003e OMC 377230, 777213\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315359\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eEvinrude 40 HP outboards, 1960-70\u003c\/li\u003e\n\u003cli\u003eEvinrude 50 HP outboards, 1971-78\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eOMC 377230\u003c\/li\u003e\n\u003cli\u003eOMC 777213\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-3083 impeller fit?\u003c\/strong\u003e The Sierra 18-3083 is built for Evinrude 40 HP outboards from 1960-70 and Evinrude 50 HP outboards from 1971-78.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-3083 impeller a genuine OMC part?\u003c\/strong\u003e It is an aftermarket impeller manufactured by Sierra, sold as a direct equivalent to OMC part numbers 377230 and 777213, not an original OMC-branded part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-3083 cross-reference to?\u003c\/strong\u003e This impeller replaces OMC 377230 and OMC 777213 on the applicable Evinrude 40 and 50 HP outboards.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3083 impeller weigh?\u003c\/strong\u003e The Sierra 18-3083 impeller weighs 0.14 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the 18-3083 impeller made from?\u003c\/strong\u003e The 18-3083 is made from metal and has a black finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many impellers come in one order of 18-3083?\u003c\/strong\u003e Each order of the Sierra 18-3083 includes one impeller.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does an outboard impeller need to be replaced?\u003c\/strong\u003e An impeller like the 18-3083 wears down over time and can crack or lose vanes, reducing water flow through the cooling system and risking engine overheating, so it is a routine maintenance replacement part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-3083 impeller fit any Evinrude outboard?\u003c\/strong\u003e No, the 18-3083 is specific to Evinrude 40 HP outboards from 1960-70 and 50 HP outboards from 1971-78; other Evinrude engines and years use different Sierra part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions of the 18-3083 impeller?\u003c\/strong\u003e The Sierra 18-3083 impeller has a package length of 5.588 cm, package width of 5.588 cm, and package height of 3.81 cm.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-3083 impeller include mounting hardware?\u003c\/strong\u003e The 18-3083 order includes the impeller itself; no additional components are listed with it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-3083 impeller?\u003c\/strong\u003e The 18-3083 impeller is black.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-3083 be identified by its UPC code?\u003c\/strong\u003e Yes, the Sierra 18-3083 impeller carries UPC 030999315359.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988139421915,"sku":"SIE-18-3083","price":24.69,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3083_lg__19051.1558125916.500.750.jpg?v=1785188315","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-3083-water-pump-impeller-for-johnson-evinrude-omc-outboards-replaces-oem-377230-777213","provider":"Good Vibes Marina","version":"1.0","type":"link"}