{"product_id":"upgraded-billet-5-piece-idler-kit-for-mercedes-benz-c-class-glc-class-c63-glc63-2015-2021-4-0l","title":"Upgraded Billet 5 Piece Idler Kit for Mercedes Benz C-Class GLC-Class C63 GLC63 (2015-2021) 4.0L","description":"\u003ch2 style=\"font-size: clamp(18px, 3vw, 21px); margin-bottom: 15px; line-height: 1.3;\"\u003eHeavy-Duty Billet 5-Piece Idler Kit for 2015-2021 Mercedes Benz C-Class, GLC-Class (W205 \/ X253)\u003c\/h2\u003e\n\n\u003cp\u003e\u003cstrong\u003eWhat it Does:\u003c\/strong\u003e The Upgraded Billet 5-Piece Serpentine Idler Kit replaces failure-prone composite pulleys on 2015-2021 Mercedes-AMG 4.0L V8 models to eliminate belt derailment risks and withstand intense engine bay heat.\u003c\/p\u003e\n\n\u003ch3\u003eThe Stock Mercedes Benz C-Class, GLC-Class Idler Pulley Weakness\u003c\/h3\u003e\n\u003cp\u003eFactory idlers installed on the \u003cstrong\u003eM177\u003c\/strong\u003e 4.0L biturbo engine use molded composite nylon bodies paired with standard-grade bearings. The \"hot-V\" turbocharger configuration of the \u003cstrong\u003eW205\u003c\/strong\u003e and \u003cstrong\u003eX253\u003c\/strong\u003e platforms concentrates immense radiant heat at the front of the timing case. Over prolonged heat cycles, OEM plastic pulleys dry out, warp, and develop micro-cracks along the ribs. Bearing grease degrades prematurely, leading to bearing seizure, harmonic vibration, belt shredding, and subsequent loss of alternator and water pump drive operation.\u003c\/p\u003e\n\n\u003ch3\u003eThe Engineering Solution\u003c\/h3\u003e\n\u003cp\u003eThis comprehensive upgrade replaces all five factory wear items with precision CNC-machined 6061 billet aluminum pulleys. Hard-anodized for high-abrasion resistance against serpentine belt wear, each pulley houses premium ZZ-rated dual-shielded Nachi bearings packed with high-temperature synthetic lubricant. The high-load bearing seals lock out road grime and engine bay grit while maintaining rotational stability at high engine speeds. The rigid aluminum construction prevents deflection under heavy transient acceleration loads, ensuring consistent belt tracking and extended accessory drive life.\u003c\/p\u003e\n\n\u003ch3\u003eWhat's Included\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e5 x CNC-machined billet aluminum idler pulleys with pre-installed ZZ-rated Nachi bearings\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdiv style=\"overflow-x: auto; margin-bottom: 20px;\"\u003e\n  \u003ctable width=\"100%\" style=\"border-collapse: collapse; border: 1px solid #e0e0e0; font-size: 14px; min-width: 300px;\"\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eFitment\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e2015-2021 Mercedes Benz C-Class, GLC-Class\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eEngine \/ Chassis\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e\n\u003cstrong\u003eM177\u003c\/strong\u003e 4.0L Biturbo V8 \/ \u003cstrong\u003eW205, X253\u003c\/strong\u003e\n\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr style=\"background-color: #f9f9f9;\"\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eStock Output\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003e469-503 hp \/ 479-516 lb-ft\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003cth style=\"padding:10px; text-align: left; border: 1px solid #e0e0e0;\"\u003eReplaces OEM Part #\u003c\/th\u003e\n\u003ctd style=\"padding:10px; border: 1px solid #e0e0e0;\"\u003eN\/A\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/table\u003e\n\u003c\/div\u003e\n\n\u003ch3\u003eCompatibility\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e2015-2021 Mercedes Benz C-Class C63 AMG 4.0L M177\u003c\/li\u003e\n  \u003cli\u003e2015-2021 Mercedes Benz C-Class C63 S AMG 4.0L M177\u003c\/li\u003e\n  \u003cli\u003e2015-2021 Mercedes Benz GLC-Class GLC63 AMG 4.0L M177\u003c\/li\u003e\n  \u003cli\u003e2015-2021 Mercedes Benz GLC-Class GLC63 S AMG 4.0L M177\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFrequently Asked Questions \u0026amp; Fitment Warnings\u003c\/h3\u003e\n\u003ch4\u003eDoes this fit the W205 and X253 C-Class, GLC-Class?\u003c\/h4\u003e\n\u003cp\u003eYes, this is a direct fit for the 2015-2021 Mercedes Benz C-Class and GLC-Class equipped with the \u003cstrong\u003eM177\u003c\/strong\u003e 4.0L engine. \u003cstrong\u003eVehicles not equipped with the 5-pulley layout or non-M177 powertrains are excluded.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch4\u003eDo I need to replace the serpentine belt or reset the tensioner during installation?\u003c\/h4\u003e\n\u003cp\u003eWhile this kit bolts directly onto the factory mounting locations, verifying belt routing and proper mechanical belt tensioner dampening is critical prior to start-up.\u003c\/p\u003e\n\n\u003ch3\u003eThe Mercedes Benz Precision Standard\u003c\/h3\u003e\n\u003cp\u003ePrecision-engineered to meet stringent European tolerance levels, these billet idlers protect your high-performance AMG drivetrain against sudden accessory failure, maintaining OEM operational silence with zero check-engine lights.\u003c\/p\u003e","brand":"VelocityMax","offers":[{"title":"Default Title","offer_id":67558772080888,"sku":"DS-E2R2336K4","price":529.95,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/1290\/2648\/files\/upgraded-billet-5-piece-idler-kit-for-mercedes-benz-c-class-glc-class-c63-glc63-2015-2021-4-0l-1.jpg?v=1790925101","url":"https:\/\/performancechiptuning.com\/es\/products\/upgraded-billet-5-piece-idler-kit-for-mercedes-benz-c-class-glc-class-c63-glc63-2015-2021-4-0l","provider":"Performance Chip Tuning","version":"1.0","type":"link"}