{"product_id":"rps-distributor-cap-and-rotor-kit-for-mercruiser-v8-5-0-8-2l-thunderbolt-i-iv-with-gasket-screws","title":"RPS Distributor Cap and Rotor Kit for Mercruiser V8 5.0–8.2L (Thunderbolt I \u0026 IV) with Gasket \u0026 Screws","description":"\u003cp\u003e\u003cstrong\u003eRPS THUNDERBOLT Distributor Cap and rotor kit is a direct-fit replacement for Mercruiser V8 engines with Thunderbolt I and IV ignition, delivering the cap, rotor, gasket and mounting screws you need to restore reliable spark distribution.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis kit is made for GM-based Mercruiser V8 marine engines (5.0L, 5.7L, 7.4L, 8.2L) and fits the common OEM references 805759Q3, 805759T3 and 18-5935. It replaces worn or cracked distributor caps and aged rotors to help maintain consistent ignition timing and spark routing across all eight cylinders. Constructed with quality brass terminals in the cap and a precision-molded rotor, the set is designed to match factory fit and connector layout while offering an economical aftermarket option.\u003c\/p\u003e\n\n\u003ch3\u003eWill this kit fit my Mercruiser 5.7 V8 with Thunderbolt ignition?\u003c\/h3\u003e\n\u003cp\u003eYes—this RPS kit is engineered to be compatible with GM-based Mercruiser V8 engines equipped with Thunderbolt I or IV systems. Check your engine’s part label or existing distributor for matching reference numbers to confirm fit.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCompatible engines: 5.0L, 5.7L, 7.4L, 8.2L V8\u003c\/li\u003e\n  \u003cli\u003eOEM references replaced: 805759Q3, 805759T3, 18-5935\u003c\/li\u003e\n  \u003cli\u003eFits Thunderbolt I and Thunderbolt IV ignition families\u003c\/li\u003e\n  \u003cli\u003eDesigned for GM-based Mercruiser distributors from early 1980s onward\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat components are included and what materials are used?\u003c\/h3\u003e\n\u003cp\u003eThe kit contains a distributor cap, a rotor, a gasket and the necessary screws for installation. The cap features brass terminal contacts for improved conductivity, while the rotor and housing use durable molded materials intended for marine engine environments.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eDistributor cap with brass terminals for reliable contact\u003c\/li\u003e\n  \u003cli\u003eMolded rotor matched to factory dimensions\u003c\/li\u003e\n  \u003cli\u003eDurable gasket to seal the distributor base\u003c\/li\u003e\n  \u003cli\u003eMounting screws included for a complete replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow straightforward is installation, and what should I prepare?\u003c\/h3\u003e\n\u003cp\u003eInstallation is a straightforward swap if your distributor matches the listed references; the kit is designed for direct replacement with no modifications. Basic hand tools and a clean workspace are typically all that’s required—be sure to mark spark plug wire positions before removal to preserve firing order.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eBasic tools: screwdriver or small socket set\u003c\/li\u003e\n  \u003cli\u003eMark wire positions to maintain correct firing order\u003c\/li\u003e\n  \u003cli\u003eInspect rotor shaft and distributor cap seating for wear\u003c\/li\u003e\n  \u003cli\u003eFollow engine service manual torque and alignment guidance\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy choose this aftermarket RPS kit instead of an OEM part?\u003c\/h3\u003e\n\u003cp\u003eThis RPS kit targets the balance between factory-fit specifications and cost-effectiveness. It reproduces the essential fit and electrical interface of the original parts, while offering a lower price point and a ready-to-install package that includes the small hardware items often missing from partial replacements.\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eOEM-compatible fit and electrical contact layout\u003c\/li\u003e\n  \u003cli\u003eIncludes cap, rotor, gasket and screws in one kit\u003c\/li\u003e\n  \u003cli\u003eCost-effective alternative to factory-priced components\u003c\/li\u003e\n  \u003cli\u003eDesigned for the common Thunderbolt ignition systems\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: The RPS THUNDERBOLT Distributor Cap and rotor kit is ideal for boat owners, marine technicians and DIY mechanics who run GM-based Mercruiser V8 engines with Thunderbolt ignition systems and need a full, direct-replacement cap-and-rotor assembly. If your distributor shows carbon tracking, cracked insulation, corroded terminals, or you’re following routine maintenance intervals, this kit provides the matching parts and hardware to return the ignition system to serviceable condition without resorting to expensive OEM-only purchases.\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 replace part number 805759Q3?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The RPS kit is designed to replace 805759Q3, 805759T3 and 18-5935 for compatible Mercruiser V8 engines.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Are the terminals copper or brass?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: The distributor cap uses quality brass terminals to provide durable, conductive contact points.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"RPS","offers":[{"title":"Default Title","offer_id":48086298165406,"sku":"B07PYD8QJX","price":43.84,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/rps-thunderbolt-cap-front-view.jpg?v=1785894338","url":"https:\/\/northtrailauto.ca\/products\/rps-distributor-cap-and-rotor-kit-for-mercruiser-v8-5-0-8-2l-thunderbolt-i-iv-with-gasket-screws","provider":"North Trail Auto","version":"1.0","type":"link"}