{"product_id":"sierra-18-0578-rear-main-oil-seal-for-mercruiser-3-7l-4-cyl-replaces-mercruiser-26-67388","title":"Sierra 18-0578 One-Piece Rear Main Seal \/ Timing Cover Seal, Replaces 26-67388","description":"\u003cp\u003eThe Sierra 18-0578 is a one-piece rear main seal and timing cover seal built for marine engine crankshaft sealing applications. Its one-piece construction combines the rear main seal and timing cover seal function into a single component, simplifying installation compared to multi-piece seal designs and reducing the number of separate parts a technician needs to fit and align during an engine rebuild or reseal job. The seal has a white finish and a compact, low-profile design measuring 5.6 x 3.7 x 0.6 inches, with a light overall weight of 0.12 pounds that keeps it easy to handle during service work.\u003c\/p\u003e\u003cp\u003eThis seal directly replaces OEM part number 26-67388, making it a straightforward drop-in option when the original equipment seal needs replacement. Each Sierra seal is built to meet or exceed the specifications of the original equipment part it replaces, giving boat owners and marine technicians a reliable aftermarket alternative for crankshaft sealing repairs. It is engineered specifically for Mercruiser crankshaft sealing applications, and is sold as a single unit.\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 18-0578\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Rear Main Seal \/ Timing Cover Seal\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDesign:\u003c\/strong\u003e One-Piece\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Marine Engine Crankshaft Sealing\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e China\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 5.6 x 3.7 x 0.6 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.12 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999973993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGTIN:\u003c\/strong\u003e 00030999973993\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e 26-67388\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUnit Count:\u003c\/strong\u003e 1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cp\u003eEngineered for Mercruiser crankshaft sealing applications as a one-piece rear main seal and timing cover seal.\u003c\/p\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e26-67388\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-0578 replace?\u003c\/strong\u003e The Sierra 18-0578 replaces OEM part number 26-67388, so it is a direct fit wherever that original seal was used.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0578 a one-piece or two-piece seal?\u003c\/strong\u003e It is a one-piece design that combines the rear main seal and timing cover seal into a single component, which simplifies installation versus a multi-piece seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-0578 seal?\u003c\/strong\u003e It has a white finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the Sierra 18-0578 seal?\u003c\/strong\u003e The Sierra 18-0578 measures 5.6 x 3.7 x 0.6 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the Sierra 18-0578 weigh?\u003c\/strong\u003e 0.12 pounds, making it easy to handle during installation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere is the Sierra 18-0578 manufactured?\u003c\/strong\u003e The country of origin listed for the Sierra 18-0578 is China.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-0578 meet OEM specifications?\u003c\/strong\u003e Yes, the Sierra 18-0578 is built to meet or exceed the specifications of the original equipment seal it replaces, OEM 26-67388.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when you order the Sierra 18-0578?\u003c\/strong\u003e One Sierra 18-0578 one-piece rear main seal and timing cover seal (unit count of 1).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the UPC for the Sierra 18-0578?\u003c\/strong\u003e The UPC is 030999973993.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat application is the Sierra 18-0578 designed for?\u003c\/strong\u003e The 18-0578 is engineered for Mercruiser crankshaft sealing applications as a rear main seal and timing cover seal.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0578 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-0578 carries a limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988080177371,"sku":"SIE-18-0578","price":24.32,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0578_lg__30159.1558120992.500.750.jpg?v=1785188494","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-0578-rear-main-oil-seal-for-mercruiser-3-7l-4-cyl-replaces-mercruiser-26-67388","provider":"Good Vibes Marina","version":"1.0","type":"link"}