{"product_id":"distributor-cap-for-mercruiser-808483-gm-v-8-module-in-cap-distributors-sierra-18-5354-crusader-38070-omc-volvo-penta-3854548","title":"Sierra 18-5354 Distributor Cap, Replaces Mercury Marine 808483, for MerCruiser 350 MAG MPI 350\/V-8","description":"\u003cp\u003eThe Sierra 18-5354 Distributor Cap is a contact-controlled, standard-rotation distributor cap built for MerCruiser 350 MAG MPI 350\/V-8 inboard\/sterndrive engines. It is designed for New GM style module-in-cap distributors and is not intended for engines running Thunderbolt ignition or MPI engines equipped with an ECM 555. The cap is machined from metal with a white exterior finish and a twist-on closure that secures firmly to the distributor housing while allowing quick removal for tune-ups or spark plug wire service.\u003c\/p\u003e\u003cp\u003eThis distributor cap covers the ignition side of a full tune-up and is commonly replaced together with the contact set, rotor, coil, and spark plug wires when servicing a MerCruiser 350 MAG MPI ignition system. It measures 5.8 x 5.5 x 5.4 inches and weighs 0.33 pounds. Every Sierra part is built to meet or exceed the performance of the original equipment component it replaces, giving boat owners a reliable factory-fit alternative for scheduled maintenance or ignition repairs.\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 18-5354\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Type:\u003c\/strong\u003e Contact controlled distributor, standard rotation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition Exclusion:\u003c\/strong\u003e Not for use with Thunderbolt ignition\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\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExterior Finish:\u003c\/strong\u003e Machined\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eClosure Type:\u003c\/strong\u003e Twist-On\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eItem Dimensions:\u003c\/strong\u003e 5.8 x 5.5 x 5.4 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.33 pounds\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI (GEN +) 350\/V-8, model year 1998, serial number range L010019-L325962\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI MIE (GEN +) 350\/V-8, model year 1998, serial number range L002008-L302199\u003c\/li\u003e\n\u003cli\u003eMerCruiser 350 MAG MPI SKI 350\/V-8, model years 1995-1998, serial number range F350583-L304599\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eCrusader 38070\u003c\/li\u003e\n\u003cli\u003eGLM 71400\u003c\/li\u003e\n\u003cli\u003eMallory 9-29411\u003c\/li\u003e\n\u003cli\u003eMercury Marine \/ MerCruiser 808483\u003c\/li\u003e\n\u003cli\u003eMercury Marine \/ MerCruiser 808483T3\u003c\/li\u003e\n\u003cli\u003eMercury Marine \/ MerCruiser 804418\u003c\/li\u003e\n\u003cli\u003eMercury Marine \/ MerCruiser 808483T\u003c\/li\u003e\n\u003cli\u003eOMC 3854548\u003c\/li\u003e\n\u003cli\u003eVolvo Penta 3854548-9\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5354 distributor cap fit?\u003c\/strong\u003e The 18-5354 fits MerCruiser 350 MAG MPI (GEN +) 350\/V-8 engines from model year 1998 with serial numbers L010019-L325962, the 350 MAG MPI MIE (GEN +) 350\/V-8 from 1998 with serial numbers L002008-L302199, and the 350 MAG MPI SKI 350\/V-8 from model years 1995-1998 with serial numbers F350583-L304599.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this cap work with a Thunderbolt ignition system?\u003c\/strong\u003e No, the Sierra 18-5354 is a contact-controlled, standard-rotation distributor cap and is not designed for engines running Thunderbolt ignition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5354 compatible with MPI engines using an ECM 555?\u003c\/strong\u003e No, this distributor cap is built for New GM style module-in-cap distributors on V-8 applications and excludes MPI engines equipped with an ECM 555.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part numbers does the Sierra 18-5354 replace?\u003c\/strong\u003e It replaces Crusader 38070, GLM 71400, Mallory 9-29411, Mercury Marine \/ MerCruiser 808483, 808483T3, 804418, and 808483T, OMC 3854548, and Volvo Penta 3854548-9.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat material is the distributor cap made from?\u003c\/strong\u003e The 18-5354 is machined from metal and finished in white.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the cap attach to the distributor?\u003c\/strong\u003e It uses a twist-on closure that secures to the distributor housing and can be removed for tune-up service or spark plug wire access.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions and weight of the 18-5354?\u003c\/strong\u003e This distributor cap measures 5.8 x 5.5 x 5.4 inches and weighs 0.33 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5354 an original equipment part or aftermarket?\u003c\/strong\u003e It is an aftermarket Sierra replacement part built to meet or exceed the performance of the original equipment distributor cap it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat other ignition parts are commonly replaced along with this cap?\u003c\/strong\u003e On a MerCruiser 350 MAG MPI ignition tune-up, the distributor cap is typically serviced together with the contact set, rotor, coil, and spark plug wires.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5354 include the rotor or spark plug wires?\u003c\/strong\u003e No, this listing is for the distributor cap only; the rotor, contact set, coil, and spark plug wires are separate components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the serial number range matter when ordering this cap?\u003c\/strong\u003e Yes, the 18-5354 is matched to specific serial number ranges on MerCruiser 350 MAG MPI engines, such as L010019-L325962 for the GEN + variant, so confirming your engine's serial number ensures correct fitment.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988209873115,"sku":"SIE-18-5354","price":32.14,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5354_lg__57179.1558129549.500.750.jpg?v=1785188006","url":"https:\/\/www.goodvibesmarina.com\/products\/distributor-cap-for-mercruiser-808483-gm-v-8-module-in-cap-distributors-sierra-18-5354-crusader-38070-omc-volvo-penta-3854548","provider":"Good Vibes Marina","version":"1.0","type":"link"}