{"product_id":"distributor-cap-for-gm-4-cyl-marine-engines-with-delco-conventional-ignition-replaces-mercruiser-393-9459q1-sierra-18-5385","title":"Sierra 18-5385 Distributor Cap, Replaces Mercruiser 393-9459Q1, Fits MerCruiser 110\/120\/140 4-Cyl I\/O","description":"\u003cp\u003eThe Sierra 18-5385 Distributor Cap is a direct-fit ignition component for MerCruiser 4-cylinder sterndrive engines using a contact-controlled, standard-rotation distributor. It is molded from durable plastic with a machined white finish and a twist-on closure that seats securely over the distributor housing for a reliable weatherproof connection to the ignition system.\u003c\/p\u003e\u003cp\u003eThis cap is engineered for MerCruiser 110, 120, and 140 model engines equipped with Delco conventional ignition, and it is not intended for use on Thunderbolt ignition systems. It cross-references to a range of OEM and aftermarket part numbers used across Mercruiser, Chris-Craft, GLM, Evinrude\/Johnson, and Mallory catalogs, making it a convenient way to source a replacement cap regardless of which brand's part number you started with. Each Sierra distributor cap is built to meet or exceed the fit, form, and function of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003eThe 18-5385 cap is the distributor cap component of a broader MerCruiser tune-up lineup that also includes a matching contact set, rotor, coil, distributor, and spark plug wires, so it can be ordered on its own for a cap-only replacement or alongside those companion parts for a full ignition service.\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 18-5385\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Type:\u003c\/strong\u003e Distributor Cap\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e White\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 0.39 x 0.39 x 0.39 inches\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 0.47 pounds\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIgnition System Type:\u003c\/strong\u003e Contact-controlled, standard rotation, Delco conventional ignition (excludes Thunderbolt ignition)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFitment:\u003c\/strong\u003e MerCruiser 110, 120, 140 4-cylinder I\/O engines\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFitment\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eMerCruiser 110 (153 cid L4), 1963-1966, Serial Number 1537370-2044033\u003c\/li\u003e\n\u003cli\u003eMerCruiser 120 (153 cid L4), 1964-1986, Serial Number 1666601-B531853\u003c\/li\u003e\n\u003cli\u003eMerCruiser 140 (181 cid L4), 1968-1986, Serial Number 2508261-B450800\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eReplaces (OEM)\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e16.69-00052\u003c\/li\u003e\n\u003cli\u003e71540\u003c\/li\u003e\n\u003cli\u003e380541\u003c\/li\u003e\n\u003cli\u003e9-29401\u003c\/li\u003e\n\u003cli\u003e393-9459Q1\u003c\/li\u003e\n\u003cli\u003e393-9459\u003c\/li\u003e\n\u003cli\u003e393-9549T\u003c\/li\u003e\n\u003cli\u003e33667\u003c\/li\u003e\n\u003cli\u003eFI6900052\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eWhat engines does the Sierra 18-5385 distributor cap fit?\u003c\/strong\u003e The 18-5385 fits MerCruiser 110 (1963-1966), MerCruiser 120 (1964-1986), and MerCruiser 140 (1968-1986) 4-cylinder I\/O engines running Delco conventional ignition.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWill this cap work on a Thunderbolt ignition system?\u003c\/strong\u003e No. The 18-5385 is designed for contact-controlled, standard-rotation distributors and specifically excludes Thunderbolt ignition setups.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5385 a genuine Sierra part or an aftermarket replacement?\u003c\/strong\u003e It is a Sierra-manufactured aftermarket distributor cap engineered to meet or exceed the fit and performance of the original equipment part it replaces.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat OEM numbers does the Sierra 18-5385 cross to?\u003c\/strong\u003e It cross-references to Mercruiser 393-9459Q1, 393-9459, 393-9549T, 33667, and FI6900052, Chris-Craft 16.69-00052, GLM 71540, Evinrude\/Johnson 380541, and Mallory 9-29401.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat is the distributor cap made of?\u003c\/strong\u003e The 18-5385 is molded from plastic with a machined white exterior finish.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow big is the 18-5385 distributor cap?\u003c\/strong\u003e It measures 0.39 x 0.39 x 0.39 inches and weighs 0.47 pounds.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eHow does the cap attach to the distributor?\u003c\/strong\u003e The 18-5385 uses a twist-on closure that secures directly over the distributor housing.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat comes in the box with the 18-5385?\u003c\/strong\u003e Each order includes one Sierra 18-5385 distributor cap only.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDo I need any other parts along with this cap for a tune-up?\u003c\/strong\u003e The 18-5385 is the cap component of a MerCruiser 4-cylinder ignition lineup that also includes a matching rotor, contact set, coil, distributor, and spark plug wires, which can be ordered separately if a full tune-up is needed.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eDoes the 18-5385 fit GM 4-cylinder engines outside of MerCruiser applications?\u003c\/strong\u003e Yes, it is built for GM 4-cylinder engines equipped with Delco conventional ignition, which includes the MerCruiser 110, 120, and 140 applications listed for this cap.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's the difference between this cap and the OEM Mercruiser 393-9459Q1?\u003c\/strong\u003e The Sierra 18-5385 is a direct cross-reference to Mercruiser 393-9459Q1 and is built to match its fit and function as a replacement part.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the 18-5385 covered by a warranty?\u003c\/strong\u003e Yes, the Sierra 18-5385 distributor cap is covered under Sierra's standard limited warranty.\u003c\/p\u003e","brand":"Sierra","offers":[{"title":"Default Title","offer_id":48988212560091,"sku":"SIE-18-5385","price":19.16,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0839\/7586\/4539\/files\/SIE-18-5385_lg__39188.1558127369.500.750.jpg?v=1785188394","url":"https:\/\/www.goodvibesmarina.com\/products\/distributor-cap-for-gm-4-cyl-marine-engines-with-delco-conventional-ignition-replaces-mercruiser-393-9459q1-sierra-18-5385","provider":"Good Vibes Marina","version":"1.0","type":"link"}