{"product_id":"marine-distributor-rotor-for-new-gm-style-module-in-cap-v-8-distributors-replaces-mercruiser-898253010-and-omc-volvo-penta-3854549-sierra-18-5405","title":"Sierra 18-5405 Ignition Rotor for MerCruiser 350 MAG MPI V-8, GM Module-in-Cap Distributors","description":"\u003cp\u003eThe Sierra 18-5405 is an ignition distributor rotor built for GM-style \"module in cap\" V-8 distributor applications, including MerCruiser 350 MAG MPI engines equipped with contact-controlled distributors running standard rotation (this rotor does not apply to Thunderbolt ignition systems). The rotor is the component inside the distributor cap that spins with the distributor shaft to route the high-voltage spark from the ignition coil to the correct spark plug wire terminal in firing order, so its fit and contact geometry directly affect spark timing and engine reliability.\u003c\/p\u003e\u003cp\u003eFinished in white, the rotor measures 3 x 2 x 2 inches and weighs 0.06 pounds, making it a compact, easy-to-stock replacement part for a tune-up or distributor cap and rotor service. It is manufactured to meet or exceed the specifications of the original equipment part it replaces, and is commonly paired with a matching distributor cap, contact set, and ignition coil when performing a full ignition tune-up on covered engines.\u003c\/p\u003e\u003cp\u003eThis rotor is confirmed for MerCruiser 350 MAG MPI (GEN +) 350 cid V-8 engines, model year 1998 within serial number range L010019-L325962; 350 MAG MPI MIE (GEN +) 350 cid V-8 engines, model year 1998 within serial number range L002008-L302199; and 350 MAG MPI SKI 350 cid V-8 engines, model years 1995-1998 within serial number range F350583-L304599.\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 18-5405\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999563729\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions (L x W x H):\u003c\/strong\u003e 3 x 2 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.06 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQuantity:\u003c\/strong\u003e 1 rotor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition System Type:\u003c\/strong\u003e Contact controlled distributor, standard rotation, excludes Thunderbolt ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistributor Style:\u003c\/strong\u003e GM style module in cap, V-8 application\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI (GEN +) 350\/V-8, 1998, Serial L010019-L325962\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI MIE (GEN +) 350\/V-8, 1998, Serial L002008-L302199\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI SKI 350\/V-8, 1995-1998, Serial F350583-L304599\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrusader 38071\u003c\/li\u003e\n\u003cli\u003eGLM 71100\u003c\/li\u003e\n\u003cli\u003eMallory 9-29209\u003c\/li\u003e\n\u003cli\u003eMercruiser 898253010\u003c\/li\u003e\n\u003cli\u003eMercruiser 808484-1\u003c\/li\u003e\n\u003cli\u003eMercruiser 804423\u003c\/li\u003e\n\u003cli\u003eMercruiser 8M6001253\u003c\/li\u003e\n\u003cli\u003eOMC 3854549\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3854549-7\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3862014\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-5405 rotor used for?\u003c\/strong\u003e The Sierra 18-5405 is an ignition distributor rotor that mounts inside the distributor cap and routes spark from the coil to each spark plug wire terminal in firing order, and it is designed for GM style module in cap V-8 distributors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5405 rotor fit my MerCruiser 350 MAG MPI?\u003c\/strong\u003e Yes, on the 350 MAG MPI (GEN +) 350\/V-8 built in 1998 within serial number range L010019-L325962, and on the 350 MAG MPI MIE (GEN +) 350\/V-8 also built in 1998 within serial number range L002008-L302199 - check your engine serial number against these ranges before ordering.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5405 rotor work on MerCruiser 350 MAG MPI SKI engines?\u003c\/strong\u003e Yes, the Sierra 18-5405 covers the 350 MAG MPI SKI 350\/V-8, model years 1995-1998, within serial number range F350583-L304599.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes this rotor work with Thunderbolt ignition systems?\u003c\/strong\u003e No, the Sierra 18-5405 is built for contact controlled distributors with standard rotation and specifically excludes Thunderbolt ignition applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the 18-5405 rotor replace?\u003c\/strong\u003e It is interchangeable with Crusader 38071, GLM 71100, Mallory 9-29209, Mercruiser 898253010, 808484-1, and 804423, 8M6001253, OMC 3854549, and Volvo Penta 3854549-7 and 3862014.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat color and material is the 18-5405 rotor?\u003c\/strong\u003e The rotor is white and is sized at 3 x 2 x 2 inches, weighing 0.06 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5405 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e It is an aftermarket replacement rotor manufactured by Sierra to meet or exceed the specifications of the original equipment rotor it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow many rotors come in a package of the 18-5405?\u003c\/strong\u003e One Sierra 18-5405 rotor is included per package.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat type of distributor does the 18-5405 rotor fit?\u003c\/strong\u003e It fits GM style module in cap distributors used in V-8 applications, specifically contact controlled distributors running standard rotation.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eShould I replace the distributor cap at the same time as the 18-5405 rotor?\u003c\/strong\u003e During a full ignition tune-up, the rotor is commonly replaced alongside the distributor cap, contact set, and coil to restore complete ignition performance, though the 18-5405 itself is sold as the rotor only.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988213674203,"sku":"SIE-18-5405","price":13.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/Untitled-1__01083.1753840681.500.750.jpg?v=1785189068","url":"https:\/\/www.goodvibesmarina.com\/products\/marine-distributor-rotor-for-new-gm-style-module-in-cap-v-8-distributors-replaces-mercruiser-898253010-and-omc-volvo-penta-3854549-sierra-18-5405","provider":"Good Vibes Marina","version":"1.0","type":"link"}