{"product_id":"sierra-18-5418-distributor-rotor-for-gm-4-cylinder-single-point-ignition-replaces-chris-craft-16-69-00051-and-omc-384735","title":"Sierra Distributor Rotor 18-5418 for MerCruiser 110\/120\/140 I\/O Ignition, Replaces Mercury Marine 58217","description":"\u003cp\u003eThe Sierra 18-5418 is a distributor rotor built for MerCruiser stern drive ignition systems using a contact-controlled distributor with standard rotation (this rotor is not for Thunderbolt ignition applications). It is the rotor position specified in the MerCruiser tune-up parts breakdown for the 110, 120, and 140 model engines, all of which use a 4-cylinder inline engine (153 cid or 181 cid) paired with a points-and-condenser style distributor. The rotor mounts inside the distributor cap and rotates with the distributor shaft to direct spark from the coil to each spark plug tower in firing order, so a worn, cracked, or burned rotor tip is a common cause of misfires, hard starting, or a rough idle on these engines.\u003c\/p\u003e\u003cp\u003eAs part of a complete tune-up, the 18-5418 rotor is typically replaced alongside the contact set, distributor cap, coil, and spark plug wires that share the same engine application. It is sold as a direct-fit component for the MerCruiser 110, 120, and 140 model engines within the serial number ranges covered by those models, and it cross-references to OEM rotors used by Chris-Craft, Mercury Marine, and OMC on the same ignition 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 18-5418\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Distributor Rotor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Contact-controlled distributor, standard rotation, excludes Thunderbolt ignition\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Engines:\u003c\/strong\u003e 153 cid L4, 181 cid L4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFits Models:\u003c\/strong\u003e MerCruiser 110, 120, 140\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.03 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Dimensions:\u003c\/strong\u003e 1 x 1 x 2 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUPC:\u003c\/strong\u003e 030999236708\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 110, 153 cid L4, years 1963-1966, serial number range 1537370-2044033\u003c\/li\u003e\n\u003cli\u003eMerCruiser 120, 153 cid L4, years 1964-1986, serial number range 1666601-B531853\u003c\/li\u003e\n\u003cli\u003eMerCruiser 140, 181 cid L4, years 1968-1986, serial number range 2508261-B450800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eChris-Craft 16.69-00051\u003c\/li\u003e\n\u003cli\u003eMercury Marine 58217\u003c\/li\u003e\n\u003cli\u003eOMC 384735\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5418 rotor fit?\u003c\/strong\u003e The 18-5418 rotor fits MerCruiser 110, 120, and 140 model engines, which use a 153 cid or 181 cid L4 engine paired with a contact-controlled distributor.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this rotor work with a Thunderbolt ignition system?\u003c\/strong\u003e No, the 18-5418 rotor is built for contact-controlled distributors with standard rotation and is not intended for Thunderbolt ignition applications.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the OEM equivalent of Sierra part 18-5418?\u003c\/strong\u003e Sierra 18-5418 cross-references to Chris-Craft 16.69-00051, Mercury Marine 58217, and OMC 384735, making it a direct replacement for those OEM rotors.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow much does the 18-5418 rotor weigh?\u003c\/strong\u003e The Sierra 18-5418 distributor rotor weighs 0.03 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat are the dimensions of this rotor?\u003c\/strong\u003e The 18-5418 rotor measures 1 x 1 x 2 inches.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat serial number range applies to the MerCruiser 120 with this rotor?\u003c\/strong\u003e For the MerCruiser 120, the 18-5418 rotor applies to serial number range 1666601 through B531853, covering years 1964-1986.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs this rotor sold individually or as part of a kit?\u003c\/strong\u003e The 18-5418 is sold as an individual rotor; it is one of the components listed in the MerCruiser tune-up parts breakdown alongside the contact set, distributor cap, coil, and spark plug wires.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat years does the 18-5418 rotor cover for the MerCruiser 110?\u003c\/strong\u003e For the MerCruiser 110, the 18-5418 rotor covers model years 1963-1966, within serial number range 1537370-2044033.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5418 rotor fit the MerCruiser 140?\u003c\/strong\u003e Yes, the MerCruiser 140 (181 cid L4) uses the 18-5418 rotor for model years 1968-1986, serial number range 2508261-B450800.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat symptoms indicate a distributor rotor needs replacement?\u003c\/strong\u003e A worn, cracked, or burned rotor tip on the ignition system that the 18-5418 fits can cause misfires, hard starting, or a rough idle, since the rotor directs spark from the coil to each spark plug in firing order.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the Sierra 18-5418 a genuine or aftermarket part?\u003c\/strong\u003e The 18-5418 is a Sierra-brand replacement rotor manufactured to match the fit and function of the original Chris-Craft, Mercury Marine, and OMC rotors it cross-references.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988213510363,"sku":"SIE-18-5418","price":4.1,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5418_lg__04803.1558128628.500.750.jpg?v=1785188045","url":"https:\/\/www.goodvibesmarina.com\/products\/sierra-18-5418-distributor-rotor-for-gm-4-cylinder-single-point-ignition-replaces-chris-craft-16-69-00051-and-omc-384735","provider":"Good Vibes Marina","version":"1.0","type":"link"}