{"product_id":"sierra-18-21752-1-marine-engine-coupler-replaces-volvo-penta-omc-3858437-984290-986120-fits-4-3l-5-0l-5-7l-1986-1998","title":"Sierra 18-21752-1 Engine Coupler, White, Replaces 3858437, Fits 4.3L 5.0L 5.7L (1986-1998)","description":"\u003cp\u003eThe Sierra 18-21752-1 is a white marine engine coupler that connects the engine flywheel to the drive unit, transmitting engine power to the outdrive on inboard\/outdrive setups. It is built to meet or exceed the specification of the original equipment part it replaces, and Sierra manufactures it to the same fit, form, and function standard used by OEM engine manufacturers and boat builders. This coupler is a direct cross-reference replacement for four OEM part numbers, so it can be ordered under any of those numbers and installed as a like-for-like swap without modification.\u003c\/p\u003e\u003cp\u003eThe coupler is engineered for GM-based marine engines commonly found in stern drive applications, with confirmed fitment across 4.3L, 5.0L, and 5.7L engine platforms spanning the 1986 through 1998 model years, with specific coverage varying by engine size. Its metal, alloy steel construction is designed to withstand the vibration, torque, and harsh marine operating environment these drivetrain components see in regular service. Because it is a direct OEM cross-reference part rather than a universal fit, boat owners and marine technicians can use it to restore original power transmission between the engine and drive unit during a coupler replacement or drivetrain rebuild.\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 18-21752-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Engine Coupler\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Metal (alloy steel)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 6.45 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 16.764 x 15.748 x 16.256 centimeters (L x H x W)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282226855\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e Limited warranty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross-Reference Numbers:\u003c\/strong\u003e 3858437, 984290, 986120, 3853917\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e4.3L engines (1986-1998)\u003c\/li\u003e\n\u003cli\u003e5.0L engines (1986-1988, 1998)\u003c\/li\u003e\n\u003cli\u003e5.7L engines (1986-1992, 1994, 1996-1998)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3858437\u003c\/li\u003e\n\u003cli\u003e984290\u003c\/li\u003e\n\u003cli\u003e986120\u003c\/li\u003e\n\u003cli\u003e3853917\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-21752-1 engine coupler fit?\u003c\/strong\u003e The Sierra 18-21752-1 fits 4.3L engines (1986-1998), 5.0L engines (1986-1988 and 1998), and 5.7L engines (1986-1992, 1994, and 1996-1998).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich OEM part numbers does the 18-21752-1 replace?\u003c\/strong\u003e It is a direct cross-reference for OEM numbers 3858437, 984290, 986120, and 3853917, so any of those part numbers can be used to identify the correct replacement.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does this engine coupler weigh?\u003c\/strong\u003e The Sierra 18-21752-1 engine coupler weighs 6.45 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color is the Sierra 18-21752-1 coupler?\u003c\/strong\u003e This coupler is white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the coupler made from?\u003c\/strong\u003e It is made of metal, specifically alloy steel construction, built to hold up under marine drivetrain loads and vibration.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-21752-1 a genuine Sierra part or aftermarket?\u003c\/strong\u003e The 18-21752-1 is a genuine Sierra marine part manufactured to meet or exceed the specification of the original equipment coupler it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this coupler fit both 5.0L and 5.7L engines the same way?\u003c\/strong\u003e Yes, one 18-21752-1 coupler covers 4.3L (1986-1998), 5.0L (1986-1988, 1998), and 5.7L (1986-1992, 1994, 1996-1998) engines, since fitment is by engine platform rather than a separate part per engine size.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-21752-1?\u003c\/strong\u003e Ordering Sierra 18-21752-1 includes one marine engine coupler.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the Sierra 18-21752-1 differ from the Sierra 18-21753 coupler?\u003c\/strong\u003e Yes, 18-21753 is a separate Sierra coupler part number with its own OEM cross-reference and its own fitment, so buyers should confirm which part number matches their engine before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the package size of the Sierra 18-21752-1?\u003c\/strong\u003e The Sierra 18-21752-1 ships in packaging measuring 16.764 x 15.748 x 16.256 centimeters (L x H x W).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs there a warranty on the Sierra 18-21752-1 engine coupler?\u003c\/strong\u003e The 18-21752-1 is covered by a limited warranty.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I cross-reference the 18-21752-1 using an old OMC or Volvo part number?\u003c\/strong\u003e Yes, if your old coupler is stamped 3858437, 984290, 986120, or 3853917, the Sierra 18-21752-1 is the correct direct replacement.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988105408731,"sku":"SIE-18-21752-1","price":277.75,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-21752-1__48722.1722487780.500.750.jpg?v=1785188113","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-21752-1-marine-engine-coupler-replaces-volvo-penta-omc-3858437-984290-986120-fits-4-3l-5-0l-5-7l-1986-1998","provider":"Good Vibes Marina","version":"1.0","type":"link"}