{"product_id":"quicksilver-distributor-cap-kit-for-mercruiser-v8-805759q3-cap-rotor-gasket-with-oe-spec-brass-terminals","title":"Quicksilver distributor cap kit for MerCruiser V8 805759Q3 — cap, rotor \u0026 gasket with OE-spec brass terminals","description":"\u003cp\u003e\u003cstrong\u003eQuicksilver 805759Q3 is a complete distributor cap kit—cap, rotor and gasket—engineered to restore reliable spark distribution on General Motors V8 MerCruiser engines using Thunderbolt IV and V HEI systems.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003cp\u003eThis replacement kit is built to Mercury Marine original-equipment specifications so your MerCruiser V8 retains proper ignition timing and electrical contact under boating conditions. The cap combines a high-strength polymer blend and solid brass terminals to resist corrosion, electrical pitting and warpage, while the rotor and gasket complete the seal and contact geometry required for efficient spark transfer. It’s intended for owners and technicians who need a durable ignition component that works with Thunderbolt IV and Thunderbolt V high-energy ignition (HEI) systems on inboard or sterndrive marine engines.\u003c\/p\u003e\n\n\u003ch3\u003eHow does this cap kit improve ignition reliability on my MerCruiser V8?\u003c\/h3\u003e\n\n\u003cp\u003eReplacing a worn distributor cap and rotor restores consistent spark paths and reduces misfires caused by degraded contacts or moisture intrusion. The kit’s materials and design minimize electrical leakage and interference so the ignition system can deliver the voltage where it’s needed.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eCap body made from PBT\/PET polymer blend for dimensional stability under heat\u003c\/li\u003e\n  \u003cli\u003eSolid brass internal terminals resist corrosion and electrical pitting\u003c\/li\u003e\n  \u003cli\u003eGasket included for a proper seal against moisture and contaminants\u003c\/li\u003e\n  \u003cli\u003eDesigned to limit RFI interference with onboard electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWill this fit my engine and ignition system?\u003c\/h3\u003e\n\n\u003cp\u003eThe 805759Q3 kit is specifically manufactured to fit General Motors V8 MerCruiser engines equipped with Thunderbolt IV and Thunderbolt V HEI ignition systems. It follows Mercury Marine OE specifications so it aligns with the rotor shaft, terminal spacing and mounting points used on these applications.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eIntended for GM-based MerCruiser V8 inboards and sterndrives\u003c\/li\u003e\n  \u003cli\u003eCompatible with Thunderbolt IV and Thunderbolt V HEI distributor layouts\u003c\/li\u003e\n  \u003cli\u003eDirect-replacement form, fit and function where OE part numbers match\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat materials and features help this kit last in marine environments?\u003c\/h3\u003e\n\n\u003cp\u003eThe cap uses a high strength-to-weight polymer blend that resists warping and thermal cracking, while the rotor and brass inserts keep electrical connections clean and conductive. The gasket and RFI-resistant design add protection against moisture and electronic interference common in powerboat systems.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003ePBT\/PET plastic blend resists heat distortion and physical stress\u003c\/li\u003e\n  \u003cli\u003eSolid brass inserts reduce corrosion and electrical pitting over time\u003c\/li\u003e\n  \u003cli\u003eGasket seals out moisture and salt spray to maintain performance\u003c\/li\u003e\n  \u003cli\u003eEngineered to reduce radio-frequency interference with electronics\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHow simple is the installation and what should I inspect during replacement?\u003c\/h3\u003e\n\n\u003cp\u003eInstallation is straightforward for anyone familiar with distributor service: remove the old cap and rotor, fit the gasket and replace with the new components, ensuring correct rotor orientation and secure terminals. While replacing the kit, check the distributor shaft and ignition coil connections, and verify there are no cracked spark plug wires or corrosion at terminal ends.\u003c\/p\u003e\n\n\u003cul\u003e\n  \u003cli\u003eSwap cap and rotor in minutes with standard hand tools\u003c\/li\u003e\n  \u003cli\u003eConfirm rotor alignment and terminal seating before final mounting\u003c\/li\u003e\n  \u003cli\u003eInspect coil leads, spark plug wires and distributor shaft for wear\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eWho is this for: Boat owners, marine mechanics and restorers operating GM-based MerCruiser V8 engines with Thunderbolt IV or V HEI systems who need a reliable, OE-spec replacement distributor cap kit. It’s aimed at those seeking durable materials, corrosion-resistant terminals and an easy, direct-replacement solution to restore proper ignition performance in marine environments.\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: Is this distributor cap kit compatible with Thunderbolt IV and V?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. The 805759Q3 kit is made to fit GM MerCruiser V8 engines that use Thunderbolt IV and Thunderbolt V HEI systems.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003cdiv class=\"faq-item\"\u003e\n\u003cp class=\"faq-q\"\u003eQ: Does the kit include a gasket and corrosion-resistant terminals?\u003c\/p\u003e\n\u003cp class=\"faq-a\"\u003eA: Yes. It includes a gasket plus solid brass internal inserts for corrosion resistance and long service life.\u003c\/p\u003e\n\u003c\/div\u003e\u003c\/section\u003e","brand":"Quicksilver","offers":[{"title":"Default Title","offer_id":48083996410014,"sku":"B001HBSXKK","price":82.27,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0781\/2041\/9486\/files\/quicksilver-distributor-cap-kit-front-view.jpg?v=1785842629","url":"https:\/\/northtrailauto.ca\/products\/quicksilver-distributor-cap-kit-for-mercruiser-v8-805759q3-cap-rotor-gasket-with-oe-spec-brass-terminals","provider":"North Trail Auto","version":"1.0","type":"link"}