{"product_id":"exhaust-elbow-mounting-gasket-18-0881-1-for-mercruiser-3-7l-224-cid-4-cylinder-models-165-170-180-190","title":"Sierra Exhaust Elbow Gasket 18-0881-1 for MerCruiser 3.7L 170\/180 HP Aluminum Exhaust Manifolds","description":"\u003cp\u003eThe Sierra 18-0881-1 is an exhaust elbow gasket engineered as a direct-fit seal for MerCruiser 3.7L 224 cid 4-cylinder sterndrive engines equipped with aluminum exhaust manifolds. It seals the mating surface between the exhaust manifold and exhaust elbow, containing hot exhaust gas and cooling water so the joint stays leak-free under the heat cycling and vibration typical of marine engine operation. Because this gasket is specified for the aluminum manifold configuration rather than the cast iron version, it is engineered to match the mounting geometry and surface finish of aluminum manifold assemblies specifically -- installing the wrong gasket variant on the wrong manifold material can lead to a poor seal and coolant or exhaust leakage.\u003c\/p\u003e\u003cp\u003eThis gasket applies to MerCruiser 3.7L engines rated at 170 HP (1985-1986 model years, serial numbers 6916779 through B434940) and 180 HP (1987 model year, serial numbers B436391 through B775248), both using the 224 cid 4-cylinder block with aluminum exhaust manifolds. At 0.14 pounds, it is a lightweight, precision-cut flat gasket intended as a one-for-one replacement during exhaust manifold or exhaust elbow service, gasket refresh after removal, or routine maintenance where the manifold-to-elbow joint is disturbed.\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 18-0881-1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Exhaust Elbow Gasket\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.14 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 808282365820\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEngine Application:\u003c\/strong\u003e MerCruiser 3.7L, 224 cid, 4-cylinder\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExhaust Manifold Type:\u003c\/strong\u003e Aluminum exhaust manifold configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower Ratings:\u003c\/strong\u003e 170 HP and 180 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel Years:\u003c\/strong\u003e 1985-1986 (170 HP), 1987 (180 HP)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSerial Number Range:\u003c\/strong\u003e 6916779 - B434940 (170 HP); B436391 - B775248 (180 HP)\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 3.7L, 224 cid, 4-cylinder, 170 HP, 1985-1986, serial numbers 6916779 - B434940, aluminum exhaust manifolds\u003c\/li\u003e\n\u003cli\u003eMerCruiser 3.7L, 224 cid, 4-cylinder, 180 HP, 1987, serial numbers B436391 - 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 18-0881-1 exhaust elbow gasket fit?\u003c\/strong\u003e It fits MerCruiser 3.7L, 224 cid, 4-cylinder engines rated at 170 HP (1985-1986, serial numbers 6916779 - B434940) and 180 HP (1987, serial numbers B436391 - B775248), specifically the versions with aluminum exhaust manifolds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this gasket work with cast iron exhaust manifolds?\u003c\/strong\u003e No, the 18-0881-1 gasket is specified for the aluminum exhaust manifold configuration on the MerCruiser 3.7L 224 cid engine; engines with cast iron exhaust manifolds require a different gasket part number.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-0881-1 exhaust elbow gasket weigh?\u003c\/strong\u003e 0.14 pounds is the weight of the Sierra 18-0881-1 exhaust elbow gasket.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhere on the engine does this gasket install?\u003c\/strong\u003e The 18-0881-1 seals the joint between the exhaust manifold and the exhaust elbow on applicable MerCruiser 3.7L aluminum-manifold engines, sealing both exhaust gas and cooling water at that connection.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I use this gasket for a routine exhaust elbow gasket replacement?\u003c\/strong\u003e Yes, the 18-0881-1 is intended as a direct replacement gasket for service work whenever the exhaust manifold-to-elbow joint on a covered MerCruiser 3.7L aluminum-manifold engine is disassembled.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-0881-1 a genuine Sierra part or aftermarket equivalent?\u003c\/strong\u003e 18-0881-1 is the Sierra manufacturer part number for this exhaust elbow gasket, sold as Sierra's own catalog item rather than a third-party equivalent.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model years does the 170 HP application cover?\u003c\/strong\u003e The 170 HP MerCruiser 3.7L application for the 18-0881-1 gasket covers 1985-1986 model years, engine serial numbers 6916779 through B434940.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat model years does the 180 HP application cover?\u003c\/strong\u003e 1987 is the model year for the 180 HP MerCruiser 3.7L application of the 18-0881-1 gasket, spanning serial numbers B436391 through B775248.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order this part?\u003c\/strong\u003e Ordering the Sierra 18-0881-1 includes one exhaust elbow gasket sized for the MerCruiser 3.7L aluminum exhaust manifold applications listed for this part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow do I know if my engine has aluminum or cast iron exhaust manifolds?\u003c\/strong\u003e Since the 18-0881-1 gasket is built specifically for the aluminum exhaust manifold version of the MerCruiser 3.7L 224 cid engine, confirming manifold material before ordering ensures the correct gasket is installed, as the cast iron version uses a different Sierra part number.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988086239451,"sku":"SIE-18-0881-1","price":16.65,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-0881_lg__28756.1558120731.500.750.jpg?v=1785329157","url":"https:\/\/www.goodvibesmarina.com\/products\/exhaust-elbow-mounting-gasket-18-0881-1-for-mercruiser-3-7l-224-cid-4-cylinder-models-165-170-180-190","provider":"Good Vibes Marina","version":"1.0","type":"link"}