{"product_id":"water-pump-housing-for-yamaha-outboard-replaces-oem-61a-44311-00-00-sierra-18-3173-1","title":"Sierra Water Pump Housing 18-3173-1, Replaces 61A-44311-00-00, 61A-44311-01-00","description":"\u003cp\u003eThe Sierra Water Pump Housing 18-3173-1 is a replacement water pump housing for Yamaha two-stroke outboard motors. The housing is the structural body of the outboard's cooling water pump, mounting the impeller and directing raw water flow to keep the engine's cooling system operating correctly. Replacing a cracked, worn, or corroded water pump housing is a standard part of outboard lower unit water pump service and helps prevent overheating caused by a failing pump assembly.\u003c\/p\u003e\u003cp\u003eSierra manufactures this housing as a direct cross-reference to the original Yamaha part numbers listed below, making it a straightforward like-for-like replacement during a water pump rebuild or lower unit service. It is sold as the housing component only.\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 18-3173-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282362102\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.62 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Yamaha Outboard Water Pumps and Impellers, Two-Stroke\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 61A-44311-00-00, 61A-44311-01-00\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIncluded Components:\u003c\/strong\u003e Water Pump Housing\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eDesigned for Yamaha two-stroke outboard motors.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e61A-44311-00-00\u003c\/li\u003e\n\u003cli\u003e61A-44311-01-00\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-3173-1 water pump housing used for?\u003c\/strong\u003e The Sierra 18-3173-1 is a water pump housing for Yamaha two-stroke outboard motors, serving as the body that holds the impeller and directs raw cooling water through the pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does 18-3173-1 replace?\u003c\/strong\u003e It cross-references to Yamaha OEM numbers 61A-44311-00-00 and 61A-44311-01-00, so either original number matches this Sierra housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the water pump housing include the impeller?\u003c\/strong\u003e No, the Sierra 18-3173-1 is the housing component only; the impeller and other pump service parts are sold separately.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-3173-1 water pump housing weigh?\u003c\/strong\u003e It weighs 0.62 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-3173-1 a genuine Yamaha part or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket replacement housing, built to cross-reference directly with Yamaha OEM part numbers 61A-44311-00-00 and 61A-44311-01-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat outboard motors is the 18-3173-1 housing compatible with?\u003c\/strong\u003e The 18-3173-1 water pump housing is designed for Yamaha two-stroke outboard motors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use 18-3173-1 to replace a cracked or corroded water pump housing?\u003c\/strong\u003e Yes, replacing a cracked or corroded housing with the Sierra 18-3173-1 is a common fix during outboard water pump service to restore proper cooling water flow.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part 18-3173-1?\u003c\/strong\u003e The order includes one Sierra water pump housing, part number 18-3173-1.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs 18-3173-1 the same as Sierra part 18-3170 or 18-3171?\u003c\/strong\u003e No, 18-3170 and 18-3171 are separate Sierra water pump housing part numbers with their own distinct OEM cross-references; only 18-3173-1 replaces Yamaha 61A-44311-00-00 and 61A-44311-01-00.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhy does the water pump housing need replacing during a pump service?\u003c\/strong\u003e Over time the housing can crack, wear, or corrode from heat and water exposure, which can allow cooling water to leak or bypass the impeller; installing a Sierra 18-3173-1 housing addresses this during a full pump rebuild.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988140994779,"sku":"SIE-18-3173-1","price":23.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-3173-1__82423.1737864364.500.750.jpg?v=1785188437","url":"https:\/\/www.goodvibesmarina.com\/products\/water-pump-housing-for-yamaha-outboard-replaces-oem-61a-44311-00-00-sierra-18-3173-1","provider":"Good Vibes Marina","version":"1.0","type":"link"}