{"product_id":"sierra-18-1937-exhaust-elbow-replaces-mercruiser-98562a6-fits-3-7l-224-cu-in-4-cyl-165-170-180-190","title":"Sierra 18-1937 Exhaust Elbow for Mercruiser 3.7L Engines with Aluminum Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-1937 is an exhaust elbow built for Mercruiser 3.7L (224 cid) 4-cylinder sterndrive engines equipped with aluminum exhaust manifolds. The elbow routes exhaust gases and cooling water away from the manifold and out through the exhaust system, and it is manufactured as a direct OE replacement that is fully interchangeable with the original equipment part it replaces. It is primed and painted in grey for added durability and corrosion protection, and it arrives ready to install out of the box without additional machining or fitting.\u003c\/p\u003e\u003cp\u003eThis elbow is designed specifically for engines fitted with aluminum exhaust manifolds rather than cast iron manifolds, so confirming manifold material before ordering ensures correct fitment. It fits 3.7L engines rated at 170 HP for the 1985-1986 model years within serial number range 6916779 to B434940, as well as 3.7L engines rated at 180 HP for 1987 within serial number range B436391 to B775248. Always verify your engine's serial number against these ranges before purchase.\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 18-1937\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Exhaust Elbow\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCategory:\u003c\/strong\u003e Mercruiser Exhaust Manifolds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompatible Engine:\u003c\/strong\u003e 3.7L (224 cid) 4-cylinder Mercruiser engines\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Manifold Type:\u003c\/strong\u003e Aluminum\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment (170 HP):\u003c\/strong\u003e 1985-1986, serial numbers 6916779 to B434940\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment (180 HP):\u003c\/strong\u003e 1987, serial numbers B436391 to B775248\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Grey\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFinish:\u003c\/strong\u003e Primed and painted\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePackage Dimensions:\u003c\/strong\u003e 20 inches x 9 inches x 7 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 34.53 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282126766\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e3.7L (224 cid) engine, 170 HP, 1985-1986, serial numbers 6916779 to B434940, aluminum exhaust manifolds\u003c\/li\u003e\n\u003cli\u003e3.7L (224 cid) engine, 180 HP, 1987, serial numbers B436391 to B775248, aluminum exhaust manifolds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-1937 exhaust elbow fit?\u003c\/strong\u003e The Sierra 18-1937 fits Mercruiser 3.7L (224 cid) 4-cylinder engines equipped with aluminum exhaust manifolds, covering 170 HP engines from 1985-1986 (serial numbers 6916779 to B434940) and 180 HP engines from 1987 (serial numbers B436391 to B775248).\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-1937 elbow work with cast iron exhaust manifolds?\u003c\/strong\u003e No, the 18-1937 elbow is designated for engines with aluminum exhaust manifolds; a separate part number applies to the cast iron manifold version, so confirm your manifold material before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I confirm my engine matches this part?\u003c\/strong\u003e Check your Mercruiser 3.7L engine's serial number against the ranges listed for the 18-1937 elbow: 6916779-B434940 for the 170 HP 1985-1986 application, or B436391-B775248 for the 180 HP 1987 application.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-1937 a direct OEM replacement?\u003c\/strong\u003e Yes, the 18-1937 elbow is manufactured as a direct OE replacement and is fully interchangeable with the original equipment elbow it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and finish does the 18-1937 elbow have?\u003c\/strong\u003e This exhaust elbow is grey and comes primed and painted for added durability and corrosion protection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-1937 exhaust elbow weigh?\u003c\/strong\u003e The Sierra 18-1937 exhaust elbow weighs 34.53 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the package dimensions for the 18-1937 elbow?\u003c\/strong\u003e It ships in a package measuring 20 inches x 9 inches x 7 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs installation straightforward for this elbow?\u003c\/strong\u003e The Sierra 18-1937 arrives ready to install out of the box, with no additional fitting required before mounting to a compatible 3.7L Mercruiser engine.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order part number 18-1937?\u003c\/strong\u003e Ordering the 18-1937 includes one exhaust elbow; no gasket or additional hardware is specified with this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-1937 fit a 3.7L engine outside the listed serial number ranges?\u003c\/strong\u003e Fitment for the Sierra 18-1937 is specific to the 170 HP 1985-1986 range (6916779-B434940) and the 180 HP 1987 range (B436391-B775248); engines outside these ranges should be verified before purchase.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988089352411,"sku":"SIE-18-1937","price":338.67,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/18-1937__94011.1727708051.500.750.jpg?v=1785189034","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-1937-exhaust-elbow-replaces-mercruiser-98562a6-fits-3-7l-224-cu-in-4-cyl-165-170-180-190","provider":"Good Vibes Marina","version":"1.0","type":"link"}