{"product_id":"oil-seal-for-mercury-force-outboard-powerhead-replaces-26-41132-sierra-18-0580","title":"Sierra 18-0580 Oil Seal, Replaces Mercury\/Chrysler\/Force 26-41132","description":"\u003cp\u003eThe Sierra 18-0580 Oil Seal is a round, white oil seal engineered as a direct interchange for the 26-41132 seal used across multiple outboard powerhead applications. It is built to the same critical dimensions as the original equipment part it replaces, with a 1.250 inch outer diameter, a 0.750 inch shaft size, and a 0.312 inch width, so it seats and seals correctly in the same bore and against the same shaft as the part it replaces. As a powerhead seal, its primary job is to keep lubricating oil contained around a rotating shaft while excluding water and debris from the crankcase area, protecting internal components from contamination and oil loss.\u003c\/p\u003e\u003cp\u003eSierra manufactures this seal to meet or exceed the performance of the original equipment part, making it a straightforward replacement when an outboard's powerhead seal has hardened, cracked, or begun to leak. Because it is sold as a single seal, it drops in wherever a 26-41132 (or its cross-referenced equivalents) is specified, without requiring any modification to the surrounding housing.\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 18-0580\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-41132\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOuter Diameter:\u003c\/strong\u003e 1.250 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShaft Size:\u003c\/strong\u003e 0.750 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWidth:\u003c\/strong\u003e 0.312 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShape:\u003c\/strong\u003e Round\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.02 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Mercury Outboard Powerhead Seals and O-Rings\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eFits applications originally specified with a 26-41132 oil seal or its cross-referenced equivalents.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-41132\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0580 oil seal replace?\u003c\/strong\u003e It replaces OEM number 26-41132. The Sierra 18-0580 oil seal is built to the same dimensions as that original part so it installs as a direct swap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of the Sierra 18-0580 oil seal?\u003c\/strong\u003e The Sierra 18-0580 measures 1.250 inches on the outer diameter, has a 0.750 inch shaft size, and is 0.312 inches wide.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0580 a genuine Sierra part or aftermarket?\u003c\/strong\u003e It is a Sierra-manufactured replacement seal, not a part sold under the original equipment manufacturer's own brand. Sierra states it meets or exceeds the performance of the original 26-41132 seal it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and shape is the 18-0580 oil seal?\u003c\/strong\u003e It is a round seal finished in white, matching the standard oil seal shape used in outboard powerhead applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0580 oil seal weigh?\u003c\/strong\u003e The seal weighs 0.02 pounds, consistent with a small, single powerhead seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the purpose of the 18-0580 oil seal in an outboard powerhead?\u003c\/strong\u003e This seal keeps lubricating oil contained around a rotating shaft while keeping water and debris out of the crankcase area, protecting internal powerhead components from contamination and oil loss.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0580 come as a single seal or a kit?\u003c\/strong\u003e It is sold as a single oil seal, part number 18-0580, not as part of a multi-seal kit.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the Sierra 18-0580 fit if my part is marked 26-41132?\u003c\/strong\u003e Yes, a part marked 26-41132 is the OEM number that the Sierra 18-0580 oil seal is designed to replace directly.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if I need to replace an oil seal like the 18-0580?\u003c\/strong\u003e Signs of a failing powerhead oil seal include visible oil leakage around the shaft, water intrusion into the crankcase, or a hardened and cracked seal surface; the 18-0580 addresses these issues as a direct replacement for the 26-41132 seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat category of part is the Sierra 18-0580?\u003c\/strong\u003e The 18-0580 is categorized as a powerhead seal, part of Sierra's outboard powerhead seals and O-rings line.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988083781851,"sku":"SIE-18-0580","price":13.1,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0580_lg__51203.1558121135.500.750.jpg?v=1785189148","url":"https:\/\/www.goodvibesmarina.com\/products\/oil-seal-for-mercury-force-outboard-powerhead-replaces-26-41132-sierra-18-0580","provider":"Good Vibes Marina","version":"1.0","type":"link"}