{"product_id":"merc-567","title":"MerCruiser Distributor Cap \u0026 Rotor Kit 805759Q3 | GM V8 Thunderbolt IV \u0026 V","description":"\u003ch2\u003eDistributor Cap \u0026amp; Rotor Kit — Part 805759Q3\u003c\/h2\u003e\n\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003cth\u003ePart Number\u003c\/th\u003e\n\u003ctd\u003e805759Q3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eBrand\u003c\/th\u003e\n\u003ctd\u003eMercury Marine \/ MerCruiser \/ Quicksilver\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eOfficial Product Type\u003c\/th\u003e\n\u003ctd\u003eDistributor Cap and Rotor Kit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eSystem\u003c\/th\u003e\n\u003ctd\u003eIgnition — Thunderbolt IV \/ Thunderbolt V HEI Distributor\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eKit Contents\u003c\/th\u003e\n\u003ctd\u003eDistributor cap, rotor, and cap gasket\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eCap Construction\u003c\/th\u003e\n\u003ctd\u003ePBT\/PET plastic with solid brass terminal inserts\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eRelated Mercury Reference\u003c\/th\u003e\n\u003ctd\u003e805759T3\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth\u003eAftermarket Cross-Reference\u003c\/th\u003e\n\u003ctd\u003eSierra 18-5273, GLM 71780, CDI Electronics E66-0012\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003cp\u003eThis is the genuine OEM distributor cap and rotor kit for marinized GM V8 MerCruiser engines equipped with \u003cstrong\u003eThunderbolt IV or Thunderbolt V HEI ignition systems\u003c\/strong\u003e. The kit includes the distributor cap, rotor, and cap gasket — everything required for a complete distributor service on applicable engines.\u003c\/p\u003e\n\n\u003cp\u003eThe cap uses PBT\/PET plastic construction for heat and warpage resistance, with solid brass terminal inserts to resist corrosion and electrical pitting. It is also designed to reduce RFI interference with onboard electronics — an important consideration in the marine environment.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eIgnition system identification matters:\u003c\/strong\u003e MerCruiser used multiple HEI distributor designs on similar GM V8 engines. The 805759Q3 kit is specifically for the \u003cstrong\u003eThunderbolt IV and Thunderbolt V\u003c\/strong\u003e family. It is not the same kit used on later Delco HEI distributors. Confirm your distributor type before ordering.\u003c\/p\u003e\n\n\u003ch2\u003ePart Number Reference\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent OEM kit number:\u003c\/strong\u003e 805759Q3 (Quicksilver) \/ 805759T3 (Mercury equivalent)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEarlier cap references:\u003c\/strong\u003e 805759T1, 805759A5, 805759A2, 16457A4\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRotor references:\u003c\/strong\u003e 13524T1, 13524A5, 13524A1\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAftermarket:\u003c\/strong\u003e Sierra 18-5273, GLM 71780, CDI Electronics E66-0012\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eCompatible Applications\u003c\/h2\u003e\n\u003cp\u003e\u003cem\u003eFitment is by ignition system type, not displacement alone. Confirm the distributor is a Thunderbolt IV or Thunderbolt V HEI unit before ordering. Verify by engine serial number and ignition diagram.\u003c\/em\u003e\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5.0L \/ 305 CID V8\u003c\/strong\u003e — Selected MerCruiser applications with Thunderbolt IV or Thunderbolt V HEI distributor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e5.7L \/ 350 CID V8\u003c\/strong\u003e — Selected MerCruiser applications with Thunderbolt IV or Thunderbolt V HEI distributor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e7.4L \/ 454 CID V8\u003c\/strong\u003e — Selected MerCruiser applications with Thunderbolt IV or Thunderbolt V HEI distributor\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e8.2L \/ 502 CID V8\u003c\/strong\u003e — Selected MerCruiser applications with Thunderbolt IV or Thunderbolt V HEI distributor\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen This Part Needs Replacement\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eDistributor cap contacts are burned, pitted, or showing visible arcing damage\u003c\/li\u003e\n  \u003cli\u003eThe cap is cracked or has carbon tracking between terminals\u003c\/li\u003e\n  \u003cli\u003eCorrosion or green oxidation is visible on the cap terminals\u003c\/li\u003e\n  \u003cli\u003eThe rotor contact is worn, burned, or corroded\u003c\/li\u003e\n  \u003cli\u003eThe engine has an ignition miss that has been traced to the distributor\u003c\/li\u003e\n  \u003cli\u003eHard starting or rough running is confirmed to be caused by degraded cap or rotor\u003c\/li\u003e\n  \u003cli\u003eScheduled ignition tune-up calls for cap and rotor replacement\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eRelated Parts\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/8131417407524\"\u003eMercury MerCruiser Distributor Cap Gasket 27-805760\u003c\/a\u003e — cap gasket (also included in this kit)\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/8131417341988\"\u003eMercury Distributor Cap \u0026amp; Rotor Kit 805759T3\u003c\/a\u003e — Mercury-branded equivalent kit\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/11141361991716\"\u003eArco DR004 Distributor Rotor — MerCruiser Thunderbolt V8 5.0 \/ 5.7 \/ 7.4L\u003c\/a\u003e — aftermarket rotor alternative\u003c\/li\u003e\n  \u003cli\u003e\n\u003ca href=\"\/products\/11167581044772\"\u003eMercury Quicksilver 898253T23 Distributor Cap — MerCruiser 4.3L V6 MPI\u003c\/a\u003e — V6 MPI application (different system)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eInstallation Notes\u003c\/h2\u003e\n\u003cul\u003e\n  \u003cli\u003eMark or photograph spark plug wire positions before removing the old cap\u003c\/li\u003e\n  \u003cli\u003eTransfer wires one at a time where possible to avoid misfiring order\u003c\/li\u003e\n  \u003cli\u003eInspect the distributor housing interior for moisture, corrosion, or carbon tracking\u003c\/li\u003e\n  \u003cli\u003eCheck ignition wires for cracked insulation or damaged terminals — replace if needed\u003c\/li\u003e\n  \u003cli\u003eInstall the supplied cap gasket correctly to seal the housing\u003c\/li\u003e\n  \u003cli\u003eConfirm the rotor is fully seated and oriented correctly before installing the cap\u003c\/li\u003e\n  \u003cli\u003eVerify correct firing-order wire placement before starting the engine\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eParts Desk Insights\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eMost common customer issue:\u003c\/strong\u003e Ordering this kit based on engine displacement without confirming the ignition system. MerCruiser used Thunderbolt IV, Thunderbolt V, and Delco HEI distributors across similar GM V8 engine families at different production years. The cap and rotor dimensions are different between these systems — the 805759Q3 kit fits the Thunderbolt IV\/V family only. If you’re not sure which distributor your engine has, check the ignition diagram for your engine serial number range or send us the serial number before ordering.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest use case:\u003c\/strong\u003e Ideal for scheduled ignition tune-ups on Thunderbolt IV\/V-equipped MerCruiser V8 engines, or when diagnosing an ignition miss, hard starting, or rough idle that has been traced to the distributor. The kit format covers the full distributor cap service — cap, rotor, and gasket — in one order.\u003c\/p\u003e","brand":"MERC","offers":[{"title":"Default Title","offer_id":43563873763364,"sku":"805759Q3","price":88.36,"currency_code":"CAD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0743\/5799\/7604\/files\/e0de8eec-74ff-4208-a1b2-51aa2f20a00a.png?v=1789613729","url":"https:\/\/marisolmarine.com\/products\/merc-567","provider":"Marisol Marine Company","version":"1.0","type":"link"}