{"product_id":"sierra-18-2823-9-lower-water-pump-gasket-2-pack-replaces-mercury-27-19553-27-32769-fits-mercruiser-4-6-cyl-mercury-40-50-70-hp","title":"Sierra 18-2823-9 Lower Water Pump Gasket, Replaces 27-32769\/27-19553, Fits 40-50-70 HP Mercury Marine\/Mercruiser, Pack of 2","description":"\u003cp\u003eThe Sierra 18-2823-9 is a lower water pump gasket sold in a package of two, designed to seal the lower section of the water pump housing on 40-50-70 HP Mercury Marine and Mercruiser stern drive engines. This gasket sits between the water pump base and the lower housing, forming the seal that keeps raw cooling water flowing through the correct passages and prevents leaks at the pump base during operation. Because water pump gaskets harden, compress, and lose their seal over time, replacing this gasket is a standard step whenever the water pump is serviced, rebuilt, or has its impeller replaced.\u003c\/p\u003e\u003cp\u003eEach package includes two gaskets, so a single purchase covers a complete water pump service without needing a second order. The 18-2823-9 is built to the same fit and seal performance as the original equipment gasket it replaces, cross-referencing directly to OEM part numbers 27-32769 and 27-19553. Installing the correct lower water pump gasket helps maintain proper cooling system pressure and prevents water intrusion or leakage at the pump housing, which can otherwise lead to overheating or reduced water pump performance.\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 18-2823-9\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Lower Water Pump Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePack Quantity:\u003c\/strong\u003e 2 gaskets per package\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHP Rating:\u003c\/strong\u003e 40-50-70 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury Marine and Mercruiser stern drive engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 27-32769, 27-19553\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282163303\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e40-50-70 HP Mercury Marine and Mercruiser stern drive engines\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e27-32769\u003c\/li\u003e\n\u003cli\u003e27-19553\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-2823-9 gasket fit?\u003c\/strong\u003e The 18-2823-9 lower water pump gasket fits 40-50-70 HP Mercury Marine and Mercruiser stern drive engines.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many gaskets come in a package of 18-2823-9?\u003c\/strong\u003e Each package of the 18-2823-9 contains 2 lower water pump gaskets, enough for one complete water pump service.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2823-9 gasket a direct OEM replacement?\u003c\/strong\u003e Yes, the 18-2823-9 is built to seal and fit the same as the original equipment gasket it replaces, matching OEM part numbers 27-32769 and 27-19553.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-2823-9 replace?\u003c\/strong\u003e The Sierra 18-2823-9 replaces OEM numbers 27-32769 and 27-19553.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the water pump does this gasket install?\u003c\/strong\u003e This gasket seals the lower section of the water pump housing, sitting between the pump base and the lower housing on the engine's water pump assembly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the lower water pump gasket?\u003c\/strong\u003e Replace the 18-2823-9 lower water pump gasket any time the water pump is serviced, rebuilt, or the impeller is replaced, since the old gasket can harden and lose its seal over time.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat happens if I reuse the old gasket instead of installing a new 18-2823-9?\u003c\/strong\u003e A worn or hardened lower water pump gasket can leak at the pump base, allowing water intrusion or loss of cooling water pressure, so Sierra recommends installing a fresh 18-2823-9 during pump service rather than reusing the old gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-2823-9 gasket weigh?\u003c\/strong\u003e The Sierra 18-2823-9 lower water pump gasket package weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-2823-9 come with the impeller?\u003c\/strong\u003e No, the 18-2823-9 is the lower water pump gasket only, sold as a pack of 2; the impeller and impeller gasket are separate parts.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-2823-9 gasket engine-specific by horsepower?\u003c\/strong\u003e Yes, the 18-2823-9 is designed for the 40-50-70 HP range of Mercury Marine and Mercruiser stern drive engines.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988129984731,"sku":"SIE-18-2823-9","price":4.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-2823-9__89603.1737854809.500.750.jpg?v=1785188268","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-2823-9-lower-water-pump-gasket-2-pack-replaces-mercury-27-19553-27-32769-fits-mercruiser-4-6-cyl-mercury-40-50-70-hp","provider":"Good Vibes Marina","version":"1.0","type":"link"}