{"product_id":"rps-tune-up-kit-for-mercruiser-omc-2-5l-3-7l-engines-distributor-cap-rotor-wires","title":"RPS Tune Up Kit for MerCruiser \u0026 OMC 2.5L–3.7L Engines — Distributor Cap, Rotor \u0026 Wires","description":"\u003cp\u003e\u003cstrong\u003eRPS Tune Up Kit replaces the entire points-style ignition assembly for MerCruiser and OMC 2.5L, 3.0L and 3.7L 4-cylinder engines (1963–1989) with a new distributor cap, rotor, points, condenser and marine spark plug wires.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eHere is a complete, drop-in ignition service kit engineered to restore spark delivery and timing stability on classic MerCruiser and OMC 4-cylinder engines that use Delco conventional (points) ignition. The kit bundles the heavy-duty distributor cap with brass terminals, a matched rotor, contact points, condenser, a .020 metal spacer and marine-grade spark plug wires so you can replace every wear item that affects misfires, rough idle and poor starts. RPS designed the components for seaworthy durability and direct interchange with original Mercury\/MerCruiser and OMC part numbers, making this a practical choice for restorations, preventive maintenance, or getting an older rig back to reliable operation.\u003c\/p\u003e\n\n\u003ch3\u003eWhat components are included and why are they paired together?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains all the friction and electrical wear parts of a conventional points ignition: distributor cap, rotor, contact points, condenser, spark plug wires and a .020 metal spacer. These items are grouped to address both mechanical timing and electrical conductivity at once.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDistributor cap with heavy-duty brass terminals for corrosion resistance and improved conductivity.\u003c\/li\u003e\n  \u003cli\u003eMatched rotor to ensure consistent contact timing and reduced arcing.\u003c\/li\u003e\n  \u003cli\u003eContact points and condenser to restore mechanical dwell and suppress electrical noise.\u003c\/li\u003e\n  \u003cli\u003eMarine-grade spark plug wires sized for 4-cylinder routing and high dielectric strength.\u003c\/li\u003e\n  \u003cli\u003e.020 metal spacer to achieve correct point gap and timing where needed.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow does this kit help reduce misfires and improve starting?\u003c\/h3\u003e\n\u003cp\u003eReplacing worn cap, rotor and wires eliminates common failure points that cause weak or erratic sparks. New components restore voltage transfer and consistent contact timing so the spark plugs fire reliably, improving cold starts and steady idling.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eNew brass terminals reduce pitting and improve long-term contact quality versus aluminum.\u003c\/li\u003e\n  \u003cli\u003eHigh-dielectric wires reduce leakage and preserve available voltage at plugs.\u003c\/li\u003e\n  \u003cli\u003eFresh points and condenser restore correct dwell and prevent timing drift.\u003c\/li\u003e\n  \u003cli\u003eComprehensive replacement removes guesswork—no scavenged parts.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this kit fit my engine and replace OEM part numbers?\u003c\/h3\u003e\n\u003cp\u003eThis RPS tune up kit is engineered for 1963–1989 MerCruiser and OMC 4-cylinder engines that use Delco conventional (points) ignition, including 2.5L, 3.0L and 3.7L variants. It directly replaces several Mercury\/MerCruiser and OMC part numbers for a straightforward swap.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible with 2.5L (120 hp), 3.0L (140 hp), and 3.7L (165–190 hp \/ 470 series) 4-cylinder engines.\u003c\/li\u003e\n  \u003cli\u003eCross-references include Mercury\/MerCruiser 393-9459Q1, 393-9459T, 33667, 84-816761Q5 and OMC 380541 among others.\u003c\/li\u003e\n  \u003cli\u003eAftermarket interchange with Sierra 18-5385 and GLM 71540 for broader sourcing.\u003c\/li\u003e\n  \u003cli\u003eDesigned for direct, no-modification installation where original points-style systems are present.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow durable are the parts for marine environments?\u003c\/h3\u003e\n\u003cp\u003eComponents are selected with saltwater and humidity exposure in mind. Brass cap terminals, marine-grade wire construction and corrosion-conscious materials help extend service life compared with standard automotive replacements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eHeavy-duty brass terminals resist electrochemical corrosion in damp environments.\u003c\/li\u003e\n  \u003cli\u003eSpark plug wires feature high dielectric insulation to limit leakage and arcing.\u003c\/li\u003e\n  \u003cli\u003eCondenser and hardware use robust finishes to reduce premature failure.\u003c\/li\u003e\n  \u003cli\u003eBuilt and tested by RPS to meet routine marine service demands.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The RPS Tune Up Kit is intended for boat owners, marine mechanics and classic MerCruiser\/OMC restoration projects that still use Delco points-style ignition. It’s the right choice when you want a single, reliable parts package to replace every ignition wear item—ideal for preventative maintenance, eliminating intermittent ignition problems, or returning a vintage 4-cylinder stern or outboard-powered boat to dependable operation. If your engine currently uses electronic ignition or distributorless systems, this kit is not applicable; verify your distributor style before ordering.\u003c\/p\u003e\n\u003csection class=\"product-faq-snippet\"\u003e\u003ch3\u003eFAQ\u003c\/h3\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does this kit fit my 3.7L MerCruiser engine?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It fits 3.7L 4-cylinder MerCruiser\/OMC engines (1963–1989) using Delco points ignition.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the spark plug wires marine-grade?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The kit includes marine-grade, high-dielectric spark plug wires designed for moisture resistance.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RPS","offers":[{"title":"Default Title","offer_id":48081524195486,"sku":"B08R99RDW1","price":123.48,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/rps-distributor-cap-front-view.jpg?v=1785807392","url":"https:\/\/northtrailauto.ca\/products\/rps-tune-up-kit-for-mercruiser-omc-2-5l-3-7l-engines-distributor-cap-rotor-wires","provider":"North Trail Auto","version":"1.0","type":"link"}