{"product_id":"dorman-419-391-accessory-drive-belt-tensioner-assembly","title":"Dorman 419-391 Accessory Drive Belt Tensioner Assembly","description":"\u003ch2\u003eOverview of Dorman Accessory Drive Belt Tensioner Assembly 419-391\u003c\/h2\u003e\u003cp\u003eThe Dorman 419-391 accessory drive belt tensioner assembly is designed for reliable performance in Ford vehicles including the E-350 Econoline, E-350 Econoline Club Wagon, F-250, and F-350 models. This tensioner assembly ensures proper serpentine belt tension to maintain optimal engine accessory function.\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eConstructed with durable metal and plastic materials for strength and longevity\u003c\/li\u003e\n\u003cli\u003eIncludes one automatic belt tensioner with a single pulley and bearing\u003c\/li\u003e\n\u003cli\u003eDesigned for serpentine belt systems with a maximum adjustment range of 40 mm\u003c\/li\u003e\n\u003cli\u003eFeatures a counterclockwise rotation for precise belt tensioning\u003c\/li\u003e\n\u003cli\u003eCompatible mounting hole diameter of 5.08 mm and one mounting hole for secure installation\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eDetailed Product Specifications\u003c\/h2\u003e\u003cp\u003eThe Dorman 419-391 tensioner assembly features a metal body combined with a plastic pulley, balancing durability and reduced weight. The pulley has an outside diameter of 30.2 mm and an inside diameter of 78.74 mm, with a single bearing measuring 30.2 mm in diameter to support smooth rotation. The tensioner length is 5.36 inches, and it is finished in black and silver colors. This assembly is engineered specifically for serpentine belt systems, providing consistent tension to prevent belt slippage and premature wear.\u003c\/p\u003e\u003ch2\u003eCompatible Vehicles and Applications\u003c\/h2\u003e\u003cp\u003eThis accessory drive belt tensioner assembly is compatible with select Ford models, including:\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFord E-350 Econoline\u003c\/li\u003e\n\u003cli\u003eFord E-350 Econoline Club Wagon\u003c\/li\u003e\n\u003cli\u003eFord F-250\u003c\/li\u003e\n\u003cli\u003eFord F-350\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eUse the Dorman 419-391 tensioner to maintain proper belt tension in these vehicles, ensuring reliable operation of engine accessories such as the alternator, power steering pump, and air conditioning compressor.\u003c\/p\u003e\u003ch2\u003eCommon Issues Addressed by This Tensioner\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEliminates belt slippage caused by worn or loose tensioners\u003c\/li\u003e\n\u003cli\u003ePrevents premature serpentine belt wear and cracking\u003c\/li\u003e\n\u003cli\u003eReduces noise from belt misalignment or improper tension\u003c\/li\u003e\n\u003cli\u003eMaintains consistent accessory drive performance under varying engine loads\u003c\/li\u003e\n\u003cli\u003eHelps avoid engine overheating due to accessory failure\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eInstallation Notes and Tips\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003eEnsure the mounting hole diameter of 5.08 mm matches your vehicle’s specifications\u003c\/li\u003e\n\u003cli\u003eVerify the tensioner rotation is counterclockwise (CCW) before installation\u003c\/li\u003e\n\u003cli\u003eInspect the serpentine belt for wear and replace if necessary during installation\u003c\/li\u003e\n\u003cli\u003eUse proper tools to avoid damaging the plastic pulley or metal components\u003c\/li\u003e\n\u003cli\u003eFollow vehicle manufacturer torque specifications for mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eQuality Assurance and Warranty\u003c\/h2\u003e\u003cp\u003eDorman manufactures this accessory drive belt tensioner assembly to meet or exceed OEM standards for fit, form, and function. The combination of metal and plastic materials is selected to provide durability and reliable performance. While specific warranty details may vary, Dorman typically offers a limited warranty covering defects in material and workmanship. Refer to Dorman’s official documentation for exact warranty terms.\u003c\/p\u003e","brand":"Dorman","offers":[{"title":"Default Title","offer_id":43610969538741,"sku":"BKLB-419-391","price":121.9,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0628\/1442\/1173\/files\/RB_419391_Fro.jpg?v=1774983457","url":"https:\/\/www.partcatalog.com\/products\/dorman-419-391-accessory-drive-belt-tensioner-assembly","provider":"PartCatalog","version":"1.0","type":"link"}