{"product_id":"sierra-18-0558-oil-seal-for-volvo-penta-aq200-aq290-replaces-oem-851407-44-x-58-33-x-7-mm","title":"Sierra Seal 18-0558, 44mm ID x 7mm Width Marine Shaft Seal","description":"\u003cp\u003eThe Sierra 18-0558 is a marine oil seal built to keep water and contaminants out while retaining lubrication in rotating shaft applications on inboard and sterndrive engines. It is engineered to meet the demands of high-horsepower marine engines and to hold up in the harsh marine environment, where constant exposure to saltwater, vibration, and heat cycling causes ordinary seals to fail prematurely. Sierra states that this seal meets or exceeds the performance of the original equipment part it replaces, making it a dependable choice when a shaft seal needs replacing during an engine rebuild, lower-unit service, or routine maintenance.\u003c\/p\u003e\u003cp\u003eThe seal has a machined exterior finish for a precise, consistent fit against its mating bore, and it is sized with a 44 mm inside diameter and a 7 mm width. Its compact size and light weight make it easy to install as part of a broader engine or drive service without adding measurable bulk to the assembly. Sierra supplies parts like this one to OEM engine manufacturers and boat builders, so the 18-0558 is manufactured to the same quality standard used in original production.\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 18-0558\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInside Diameter:\u003c\/strong\u003e 44 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 7 mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282265427\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-0558 seal?\u003c\/strong\u003e The Sierra 18-0558 seal has a 44 mm inside diameter and a 7 mm width.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0558 seal weigh?\u003c\/strong\u003e It weighs 0.04 pounds, a lightweight component sized for shaft seal applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0558 an OEM-equivalent part?\u003c\/strong\u003e Yes, Sierra states this seal meets or exceeds the performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat finish does the 18-0558 seal have?\u003c\/strong\u003e A machined exterior finish is used on the Sierra 18-0558 to ensure a precise, consistent fit in its mating bore.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-0558?\u003c\/strong\u003e The order includes one Sierra 18-0558 seal; no additional hardware or gaskets are bundled with it.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan the 18-0558 seal be used in marine engine or drive service?\u003c\/strong\u003e Yes, it is designed for use as a shaft seal in marine engine and drive applications where water and contaminant exclusion is required.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes Sierra manufacture the 18-0558 to OEM standards?\u003c\/strong\u003e Sierra supplies parts to OEM engine manufacturers and boat builders, and the 18-0558 seal is produced to that same quality standard.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-0558 seal still in production?\u003c\/strong\u003e Yes, the Sierra 18-0558 seal is an active, currently produced part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow is the 18-0558 different from a generic aftermarket seal?\u003c\/strong\u003e The 18-0558 is manufactured by Sierra to meet or exceed the original equipment part's specifications, rather than being a generic universal-fit substitute.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the inside diameter of the 18-0558 shaft seal?\u003c\/strong\u003e The inside diameter of the Sierra 18-0558 is 44 mm, sized to seat around the shaft it seals.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988078604507,"sku":"SIE-18-0558","price":19.89,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-0558__94667.1722518353.500.750.jpg?v=1785188012","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0558-oil-seal-for-volvo-penta-aq200-aq290-replaces-oem-851407-44-x-58-33-x-7-mm","provider":"Good Vibes Marina","version":"1.0","type":"link"}