{"product_id":"mercury-mercruiser-cap-and-rotor-kit-fits-gm-v-8-engines-with-thunderbolt-iv-v-hei-ignitions-815407t5","title":"Mercury – 815407T5 Ignition Rotor and Cap Kit | V6 GM MerCruiser Engines | Thunderbolt IV \u0026 V HEI Ignition | 815407T5","description":"\u003cp data-start=\"0\" data-end=\"123\"\u003e\u003cstrong data-start=\"0\" data-end=\"121\"\u003eMercury – 815407T5 Ignition Rotor and Cap Kit | V6 GM MerCruiser Engines | Thunderbolt IV \u0026amp; V HEI Ignition | 815407T5\u003c\/strong\u003e\u003c\/p\u003e\n\u003chr data-start=\"125\" data-end=\"128\"\u003e\n\u003ch3 data-start=\"130\" data-end=\"148\"\u003e\u003cstrong data-start=\"134\" data-end=\"146\"\u003eOverview\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"149\" data-end=\"543\"\u003eWhen your engine lights up instantly and runs smooth from idle to plane, you’re hearing the sound of a healthy ignition system. The \u003cstrong data-start=\"281\" data-end=\"328\"\u003eMercury 815407T5 Ignition Rotor and Cap Kit\u003c\/strong\u003e helps keep it that way. Built for \u003cstrong data-start=\"363\" data-end=\"407\"\u003emarinized GM-based V6 MerCruiser engines\u003c\/strong\u003e with \u003cstrong data-start=\"413\" data-end=\"458\"\u003eThunderbolt IV and V HEI ignition systems\u003c\/strong\u003e, this kit restores strong, consistent spark delivery and smooth throttle response.\u003c\/p\u003e\n\u003cp data-start=\"545\" data-end=\"782\"\u003eSalt air, vibration, and heat can wear down the ignition cap and rotor over time. This genuine Mercury kit replaces both, giving your engine the crisp, even spark it needs to run its best — without radio interference or timing hiccups.\u003c\/p\u003e\n\u003chr data-start=\"784\" data-end=\"787\"\u003e\n\u003ch3 data-start=\"789\" data-end=\"811\"\u003e\u003cstrong data-start=\"793\" data-end=\"809\"\u003eKey Features\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"814\" data-end=\"929\"\u003e\n\u003cstrong data-start=\"814\" data-end=\"826\"\u003ePurpose:\u003c\/strong\u003e Replaces worn or corroded ignition cap and rotor to restore steady spark and dependable performance.\u003c\/li\u003e\n\u003cli data-start=\"932\" data-end=\"1050\"\u003e\n\u003cstrong data-start=\"932\" data-end=\"944\"\u003eFitment:\u003c\/strong\u003e Designed for \u003cstrong data-start=\"958\" data-end=\"996\"\u003emarinized GM V6 MerCruiser engines\u003c\/strong\u003e with \u003cstrong data-start=\"1002\" data-end=\"1047\"\u003eThunderbolt IV and V HEI ignition systems\u003c\/strong\u003e.\u003c\/li\u003e\n\u003cli data-start=\"1053\" data-end=\"1169\"\u003e\n\u003cstrong data-start=\"1053\" data-end=\"1070\"\u003eKit Contents:\u003c\/strong\u003e Includes a \u003cstrong data-start=\"1082\" data-end=\"1139\"\u003edistributor cap, gasket, and coated brass rotor blade\u003c\/strong\u003e for a complete replacement.\u003c\/li\u003e\n\u003cli data-start=\"1172\" data-end=\"1295\"\u003e\n\u003cstrong data-start=\"1172\" data-end=\"1189\"\u003eConstruction:\u003c\/strong\u003e Rotor and contacts coated to resist \u003cstrong data-start=\"1226\" data-end=\"1246\"\u003eRFI interference\u003c\/strong\u003e and electrical pitting in marine environments.\u003c\/li\u003e\n\u003cli data-start=\"1298\" data-end=\"1401\"\u003e\n\u003cstrong data-start=\"1298\" data-end=\"1314\"\u003eOEM Quality:\u003c\/strong\u003e Built to \u003cstrong data-start=\"1324\" data-end=\"1356\"\u003eMercury Marine factory specs\u003c\/strong\u003e for perfect fit and long-term reliability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1403\" data-end=\"1406\"\u003e\n\u003ch3 data-start=\"1408\" data-end=\"1445\"\u003e\u003cstrong data-start=\"1412\" data-end=\"1443\"\u003eEngine \u0026amp; Boat Compatibility\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli data-start=\"1448\" data-end=\"1503\"\u003eGM-based V6 MerCruiser sterndrive and inboard engines\u003c\/li\u003e\n\u003cli data-start=\"1506\" data-end=\"1549\"\u003eThunderbolt IV and V HEI ignition systems\u003c\/li\u003e\n\u003cli data-start=\"1552\" data-end=\"1615\"\u003eCommon on cruisers, runabouts, and mid-size performance boats\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003chr data-start=\"1617\" data-end=\"1620\"\u003e\n\u003ch3 data-start=\"1622\" data-end=\"1664\"\u003e\u003cstrong data-start=\"1626\" data-end=\"1662\"\u003ePerformance \u0026amp; Practical Benefits\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"1665\" data-end=\"1947\"\u003eThe \u003cstrong data-start=\"1669\" data-end=\"1681\"\u003e815407T5\u003c\/strong\u003e kit helps your engine fire up cleanly and run smoother throughout the RPM range. The brass rotor blade and terminals provide sharp, consistent spark delivery, while the coated contacts minimize RFI interference — so your GPS, radios, and sound systems stay clear.\u003c\/p\u003e\n\u003cp data-start=\"1949\" data-end=\"2257\"\u003eReplacing a worn cap and rotor can eliminate rough idle, misfires, and hesitation when accelerating. Once installed, you’ll notice easier starts, a steadier tone at cruise, and better reliability every time you hit the water. It’s a small maintenance job with a big payoff in performance and peace of mind.\u003c\/p\u003e\n\u003chr data-start=\"2259\" data-end=\"2262\"\u003e\n\u003ch3 data-start=\"2264\" data-end=\"2285\"\u003e\u003cstrong data-start=\"2268\" data-end=\"2283\"\u003eWhy Buy OEM\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2286\" data-end=\"2532\"\u003eMercury OEM ignition parts are purpose-built for marine duty — constant heat, vibration, and moisture that would quickly wear down automotive parts. Each cap and rotor is made to exact tolerances, ensuring proper fit, sealing, and spark timing.\u003c\/p\u003e\n\u003cp data-start=\"2534\" data-end=\"2775\"\u003eAftermarket kits often use lower-grade materials or looser tolerances that lead to poor spark quality and early failure. With Mercury, you’re getting a proven design that’s been tested in saltwater, heat, and real-world boating conditions.\u003c\/p\u003e\n\u003chr data-start=\"2777\" data-end=\"2780\"\u003e\n\u003ch3 data-start=\"2782\" data-end=\"2795\"\u003e\u003cstrong data-start=\"2786\" data-end=\"2793\"\u003eFAQ\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cp data-start=\"2796\" data-end=\"2955\"\u003e\u003cstrong data-start=\"2796\" data-end=\"2847\"\u003eQ1: What engines does the Mercury 815407T5 fit?\u003c\/strong\u003e\u003cbr data-start=\"2847\" data-end=\"2850\"\u003eA: It’s made for \u003cstrong data-start=\"2867\" data-end=\"2901\"\u003eV6 GM-based MerCruiser engines\u003c\/strong\u003e with \u003cstrong data-start=\"2907\" data-end=\"2952\"\u003eThunderbolt IV and V HEI ignition systems\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp data-start=\"2957\" data-end=\"3083\"\u003e\u003cstrong data-start=\"2957\" data-end=\"2987\"\u003eQ2: What comes in the box?\u003c\/strong\u003e\u003cbr data-start=\"2987\" data-end=\"2990\"\u003eA: One \u003cstrong data-start=\"2997\" data-end=\"3016\"\u003edistributor cap\u003c\/strong\u003e, one \u003cstrong data-start=\"3022\" data-end=\"3031\"\u003erotor\u003c\/strong\u003e, and one \u003cstrong data-start=\"3041\" data-end=\"3051\"\u003egasket\u003c\/strong\u003e — all OEM Mercury components.\u003c\/p\u003e\n\u003cp data-start=\"3085\" data-end=\"3255\"\u003e\u003cstrong data-start=\"3085\" data-end=\"3132\"\u003eQ3: Will it reduce electronic interference?\u003c\/strong\u003e\u003cbr data-start=\"3132\" data-end=\"3135\"\u003eA: Yes. The coated rotor and brass contacts are designed to \u003cstrong data-start=\"3195\" data-end=\"3222\"\u003eresist RFI interference\u003c\/strong\u003e with your onboard electronics.\u003c\/p\u003e\n\u003cp data-start=\"3257\" data-end=\"3409\"\u003e\u003cstrong data-start=\"3257\" data-end=\"3290\"\u003eQ4: Is it good for saltwater?\u003c\/strong\u003e\u003cbr data-start=\"3290\" data-end=\"3293\"\u003eA: Absolutely. The materials and coatings are engineered for marine environments, preventing corrosion and arcing.\u003c\/p\u003e\n\u003cp data-start=\"3411\" data-end=\"3570\"\u003e\u003cstrong data-start=\"3411\" data-end=\"3464\"\u003eQ5: How often should I replace the cap and rotor?\u003c\/strong\u003e\u003cbr data-start=\"3464\" data-end=\"3467\"\u003eA: Inspect every 100 hours or annually. Replace if you notice corrosion, pitting, or ignition issues.\u003c\/p\u003e","brand":"Mercury","offers":[{"title":"Default Title","offer_id":46936159519011,"sku":"815407T5","price":45.49,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0783\/7410\/9475\/files\/815407t5_main.jpg?v=1760631223","url":"https:\/\/partsvu.com\/en-mx\/products\/mercury-mercruiser-cap-and-rotor-kit-fits-gm-v-8-engines-with-thunderbolt-iv-v-hei-ignitions-815407t5","provider":"PartsVu","version":"1.0","type":"link"}