{"product_id":"marine-impeller-repair-kit-for-mercury-mariner-15-25-hp-2-stroke-outboards-replaces-mercury-47-85089-sierra-18-3215","title":"Sierra 18-3215 Impeller Repair Kit, Replaces Mercury 47-85089T7, Fits 15-25 HP 2-Stroke Outboards","description":"\u003cp\u003eThe Sierra 18-3215 Impeller Repair Kit is a water pump impeller service kit built for Mercury and Mariner outboard motors in the 15 to 25 hp range with 2 cycle (2-stroke) engines. The kit is engineered to meet or exceed the quality of the original equipment part it replaces, giving boat owners a reliable way to restore proper cooling water flow through the outboard's water pump without sourcing a factory-branded part. Components are made from a combination of stainless steel and marine-grade composites, materials chosen for their resistance to corrosion and wear in continuous saltwater and freshwater cooling system service. The impeller itself is white in color and is designed as a direct fit replacement for the applicable Mercury\/Mariner water pump housings, so installation follows the same procedure as the original part. Because outboard water pump kits are fit specific, buyers should confirm the part number against their existing pump housing or engine documentation before ordering to ensure proper fit. This kit ships as a single unit count and is intended for outboard motors using a transom mount configuration and gasoline fuel. Regular impeller replacement is a routine maintenance item that protects the engine from overheating caused by reduced raw water flow, making the Sierra 18-3215 a practical stocking item for outboard owners performing scheduled water pump service.\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 18-3215\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Impeller Repair Kit\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Type:\u003c\/strong\u003e 2 Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Horsepower:\u003c\/strong\u003e 25 Horsepower\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits:\u003c\/strong\u003e Various 15 thru 25 hp 2 cycle outboards\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Stainless Steel, Marine-Grade Composites\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Type:\u003c\/strong\u003e Transom Mount\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFuel Type:\u003c\/strong\u003e Gasoline\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperation Mode:\u003c\/strong\u003e Motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999315748\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.29 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMercury\/Mariner outboard motors\u003c\/li\u003e\n\u003cli\u003eVarious 15 thru 25 hp 2 cycle (2-stroke) outboards\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 12107\u003c\/li\u003e\n\u003cli\u003eMercury 47-85089T7\u003c\/li\u003e\n\u003cli\u003eMercury 47-85089Q4\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-3215 impeller kit fit?\u003c\/strong\u003e The Sierra 18-3215 Impeller Repair Kit fits various 15 thru 25 hp 2 cycle (2-stroke) Mercury and Mariner outboard motors. Since water pump kits are fit specific, confirm the part number against your existing housing before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM parts does the 18-3215 kit replace?\u003c\/strong\u003e It is designed to be interchangeable with GLM 12107, Mercury 47-85089T7, and Mercury 47-85089Q4, so it can be used as a direct replacement for any of those part numbers.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this a genuine Mercury part or an aftermarket replacement?\u003c\/strong\u003e The 18-3215 is a Sierra-branded aftermarket impeller kit, not a Mercury-branded part. It is built to meet or exceed the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the impeller made from?\u003c\/strong\u003e The Sierra 18-3215 kit uses stainless steel and marine-grade composite materials, chosen for corrosion resistance in outboard cooling water systems.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-3215 impeller kit weigh?\u003c\/strong\u003e The kit weighs 0.29 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the impeller in this kit?\u003c\/strong\u003e The impeller included in the 18-3215 kit is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many pieces come in the box?\u003c\/strong\u003e The Sierra 18-3215 is sold as a single unit count kit containing the impeller repair components for one water pump service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this kit work on a 4-stroke outboard?\u003c\/strong\u003e No. The 18-3215 kit is built for 2 cycle (2-stroke) Mercury\/Mariner outboards in the 15 to 25 hp range, not 4-stroke engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-3215 use a transom mount configuration?\u003c\/strong\u003e Yes, this impeller kit is intended for outboards using a transom mount configuration and gasoline fuel.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the water pump impeller need periodic replacement?\u003c\/strong\u003e The impeller in a water pump wears over time, and a worn impeller reduces raw water flow to the engine, which can lead to overheating. Replacing it with a kit like the Sierra 18-3215 restores proper cooling water flow.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988141584603,"sku":"SIE-18-3215","price":34.59,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-3215_lg__72549.1558124165.500.750.jpg?v=1785188195","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-impeller-repair-kit-for-mercury-mariner-15-25-hp-2-stroke-outboards-replaces-mercury-47-85089-sierra-18-3215","provider":"Good Vibes Marina","version":"1.0","type":"link"}