{"product_id":"sierra-18-5408-distributor-rotor-replaces-mercruiser-850485-omc-volvo-penta-3854311-fits-gm-v6-module-in-cap-distributors","title":"Sierra 18-5408 Distributor Rotor for GM Module in Cap V-6 Distributors, Replaces Mercruiser 850485","description":"\u003cp\u003eThe Sierra 18-5408 Rotor is a distributor rotor built for New GM Style \"Module in Cap\" distributors used in V-6 applications. It is designed to work as a matched pair with the 18-5354 distributor cap, forming the ignition rotor\/cap combination that directs spark to the correct cylinder in sequence as the distributor shaft turns. The rotor is constructed of alloy steel with a machined finish for a precise, reliable fit inside the distributor cap and consistent electrical contact against the cap's terminals.\u003c\/p\u003e\u003cp\u003eThis part is intended as a direct service replacement for worn or pitted rotors on GM V-6 marine engines equipped with module-in-cap distributor ignition systems. A worn rotor can cause misfires, hard starting, and rough idle, so replacing it along with the distributor cap during a routine tune-up helps keep ignition timing accurate across all cylinders. The Sierra 18-5408 is manufactured to meet or exceed the performance of the original equipment rotor it replaces and cross-references to common Mercruiser, OMC, Volvo Penta, GLM, and Mallory part numbers used on the same GM V-6 module-in-cap distributor platform.\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 18-5408\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Alloy Steel\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e New GM Style \"Module in Cap\" Distributors, V-6 Applications\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompanion Distributor Cap:\u003c\/strong\u003e 18-5354\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 rotor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOEM Cross Reference:\u003c\/strong\u003e GLM 71110, Mallory 9-29221, Mercruiser 850485, 898253012, 850485-1, 8M0062084, 804424, OMC 3854311, Volvo Penta 3854311-2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eNew GM Style \"Module in Cap\" Distributors, V-6 Applications\u003c\/li\u003e\n\u003cli\u003eUse with 18-5354 distributor cap\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eGLM 71110\u003c\/li\u003e\n\u003cli\u003eMallory 9-29221\u003c\/li\u003e\n\u003cli\u003eMercruiser 850485\u003c\/li\u003e\n\u003cli\u003e898253012\u003c\/li\u003e\n\u003cli\u003e850485-1\u003c\/li\u003e\n\u003cli\u003e8M0062084\u003c\/li\u003e\n\u003cli\u003e804424\u003c\/li\u003e\n\u003cli\u003eOMC 3854311\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3854311-2\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat does the Sierra 18-5408 rotor fit?\u003c\/strong\u003e The Sierra 18-5408 is built for New GM Style \"Module in Cap\" distributors used in V-6 applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhich distributor cap should I use with this rotor?\u003c\/strong\u003e Pair the Sierra 18-5408 rotor with the 18-5354 distributor cap for a correct module-in-cap V-6 ignition setup.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5408 the same as a Mercruiser 850485 rotor?\u003c\/strong\u003e Yes, the Sierra 18-5408 cross-references to Mercruiser part numbers 850485 and 850485-1, along with 898253012 and 8M0062084, for the same GM module-in-cap V-6 distributor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this rotor cross-reference to OMC or Volvo Penta numbers?\u003c\/strong\u003e Yes, the Sierra 18-5408 replaces OMC 3854311 and Volvo Penta 3854311-2, in addition to GLM 71110 and Mallory 9-29221.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the Sierra 18-5408 rotor made from?\u003c\/strong\u003e It is made of alloy steel with a machined finish for accurate fit and reliable electrical contact inside the distributor cap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5408 rotor weigh?\u003c\/strong\u003e The Sierra 18-5408 rotor weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rotors come in a package?\u003c\/strong\u003e Each package of the Sierra 18-5408 contains 1 rotor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5408 genuine OEM or aftermarket?\u003c\/strong\u003e The Sierra 18-5408 is a Sierra-brand aftermarket replacement part manufactured to meet or exceed the performance of the original equipment rotor it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this rotor work with a V-8 module-in-cap distributor?\u003c\/strong\u003e No, the 18-5408 is designed for V-6 module-in-cap distributor applications; V-8 module-in-cap setups use a different rotor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should I replace the distributor rotor?\u003c\/strong\u003e A worn or pitted rotor like the 18-5408 should be replaced when experiencing misfires, hard starting, or rough idle, typically alongside the 18-5354 distributor cap during a tune-up.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5408 rotor include the distributor cap?\u003c\/strong\u003e No, the Sierra 18-5408 is the rotor only; the matching 18-5354 distributor cap is a separate part.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988216131803,"sku":"SIE-18-5408","price":8.41,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5408_lg__98667.1558128459.500.750.jpg?v=1785188117","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5408-distributor-rotor-replaces-mercruiser-850485-omc-volvo-penta-3854311-fits-gm-v6-module-in-cap-distributors","provider":"Good Vibes Marina","version":"1.0","type":"link"}