REMOVAL AND INSTALLATION Accessory Drive Belts Conditions requiring belt replacement are excessive wear, severe glazing, frayed cords, etc. Replace any belt exhibiting any of these conditions. NOTE: Minor cracks in the ribbed side of the belt are considered acceptable. Proper removal and installation steps are as follows: Automatically Tensioned Belts 1. Install a 16mm or 5/8-inch closed end wrench for 4.9L and 7.5L and a 15mm closed end wrench for the 5.0L, 5.8L and 7.3L on the tensioner pulley bolt and lift the tensioner arm away from the belt. 2. Remove old belt. Release tensioner slowly. Do not allow tensioner to snap back after the belt is removed because this may damage the tensioner. CAUTION: Make sure the belt is properly seated on all pulleys. One revolution of the engine with an incorrectly seated belt may snap tensile members in the belt. 3. Install new belt over pulleys making sure that all belt ribs are correctly seated in the pulley grooves. Poly-V Belt Alignment http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 1/8
Manually Tensioned Belts 1. Loosen generator (alternator) adjustment bolts and pivot bolt as shown in the following illustration. 2. Remove old belt. 3. Install new belt and tension as described in this section. http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 2/8
4.9L MFI Engine Accessory Drive Belt 5.0L and 5.8L MFI Engines, Accessory Drive Belt http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 3/8
7.3L Diesel Engine Accessory Drive Belt http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 4/8
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7.5L MFI Engine Accessory Drive Belts http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 6/8
Automatic Tensioner 7.5L F-Super Duty Motorhome Chassis, Belt Tensioner http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 7/8
Belt Tensioner Pulley Replacement Conditions requiring pulley replacement are excessive pulley wear or pulley bearing noise usually resulting from extended operation in abrasive off-road conditions. Using a 16mm closed end wrench, remove the drive belt per the Automatically Tensioned Belt removal procedure in this section. 1. Using the same wrench, loosen the idler pulley retention bolt or nut. NOTE: 7.5L (not F-Super Duty Motorhome Chassis) bolts have a left-hand thread, requiring clockwise motion to loosen. 4.9L and 7.5L F- Super Duty Motorhome Chassis idler pulley bolts have a conventional right-hand thread which loosens counterclockwise. NOTE: Excessive rearward force on the bolt during removal may over-stress and crack the tensioner arm. 2. Remove bolt or nut and dust shield and remove the pulley from the tensioner arm locating boss. NOTE: Pulleys being replaced for suspected bearing wear should be evaluated for rough bearings. Bearing noise which continues or rapidly returns after a replacement pulley is installed is usually belt chirp rather than worn bearings. Bearings should rotate smoothly with a slight resistance due to the permanent lubrication. 3. Replace the pulley and reverse the removal instructions observing the correct rotation of the retention bolt.tighten bolt or nut to specifications. 2017 ALLDATA, LLC. All Rights Reserv ed. (Version 2.0.13830) http://repair.alldata.com/alldata/article/display.action?componentid=95&itypeid=376&nonstandardid=0&vehicleid=12342&miles=&printfriendly=comple 8/8