{"product_id":"sierra-18-5428-distributor-rotor-for-volvo-penta-ignition-replaces-oem-243903","title":"Sierra Distributor Rotor 18-5428, OEM 243903, Volvo Penta I\/O Ignition, Bosch 4 Cylinder Distributors","description":"\u003cp\u003eThe Sierra 18-5428 is a distributor rotor built for Volvo Penta I\/O ignition systems using Bosch 4 cylinder distributors. The rotor is the component inside the distributor cap that spins on the distributor shaft and directs the high-voltage spark from the ignition coil to the correct spark plug wire terminal in firing order. A worn, pitted, or cracked rotor causes misfires, hard starting, rough idle, or a no-start condition, so it is a standard wear item to replace along with the distributor cap and points during a tune-up.\u003c\/p\u003e\u003cp\u003eThis rotor is designed as a direct fit for Bosch 4 cylinder distributors used in Volvo Penta I\/O (inboard\/outboard) applications, and it corresponds to the original 243903 part number. It is a lightweight, precision-molded component sized to match factory tolerances for correct spark timing and contact alignment inside the distributor cap.\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 18-5428\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Name:\u003c\/strong\u003e Rotor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.04 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e I\/O - Volvo Penta Ignition System\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDistributor Type:\u003c\/strong\u003e Bosch 4 cylinder\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eVolvo Penta I\/O ignition systems with Bosch 4 cylinder distributors\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\u003cli\u003e243903\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat is the Sierra 18-5428 rotor used for?\u003c\/strong\u003e The Sierra 18-5428 is a distributor rotor that fits inside the distributor cap and directs spark from the ignition coil to each spark plug wire in firing order, used on Volvo Penta I\/O ignition systems with Bosch 4 cylinder distributors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5428 rotor fit Volvo Penta engines?\u003c\/strong\u003e Yes, the 18-5428 rotor is designed for Volvo Penta I\/O ignition systems that use a Bosch 4 cylinder distributor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM part number does the Sierra 18-5428 replace?\u003c\/strong\u003e The Sierra 18-5428 rotor corresponds to OEM part number 243903.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5428 rotor weigh?\u003c\/strong\u003e The 18-5428 rotor weighs 0.04 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill the 18-5428 rotor work with a Delco distributor?\u003c\/strong\u003e No, the 18-5428 rotor is built for Bosch 4 cylinder distributors used in Volvo Penta I\/O ignition systems, not Delco distributor applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhen should a distributor rotor like the 18-5428 be replaced?\u003c\/strong\u003e A distributor rotor should be replaced when it shows pitting, burn marks, or cracking, or as part of a routine ignition tune-up alongside the distributor cap, since a worn rotor causes misfires, rough idle, or hard starting.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5428 a genuine OEM part or an aftermarket replacement?\u003c\/strong\u003e The Sierra 18-5428 is an aftermarket replacement rotor manufactured to match the fit and function of OEM part 243903.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is included when I order the 18-5428?\u003c\/strong\u003e The 18-5428 order includes one distributor rotor; it does not include the distributor cap, condenser, or other tune-up components.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the difference between the 18-5428 rotor and the 18-5402 rotor?\u003c\/strong\u003e The 18-5428 rotor is designed for Bosch 4 cylinder distributors in Volvo Penta I\/O ignition systems, while the 18-5402 rotor is a different part designed for Delco EST V-8 distributors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eCan I install the 18-5428 rotor myself?\u003c\/strong\u003e Yes, the 18-5428 rotor is a standard distributor component that installs onto the distributor shaft in place of the old rotor, a task commonly done during routine ignition maintenance.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988213706971,"sku":"SIE-18-5428","price":14.46,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5428_lg__69090.1558128908.500.750.jpg?v=1785329155","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5428-distributor-rotor-for-volvo-penta-ignition-replaces-oem-243903","provider":"Good Vibes Marina","version":"1.0","type":"link"}