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DRIVE BELT FALLS OFF AND EXCESSIVE WEAR DIAGNOSIS Diagnostic Aids If the drive belt repeatedly falls off the drive belt pulleys, this is because of pulley misalignment. An extra load that is quickly applied on released by an accessory drive component may cause the If the drive belt is the incorrect length, the drive belt tensioner may not keep the proper tension Excessive wear on a drive belt is usually caused by an incorrect installation or the wrong drive Minor misalignment of the drive belt pulleys will not cause excessive wear, but will probably Excessive misalignment of the drive belt pulleys will cause excessive wear but may also make the Test Description The numbers below refer to the step numbers on the diagnostic table. 10 1. Tighten any loose fasteners. Refer to Fastener Tightening Specifications. 2. Replace improper or missing fasteners. Did you complete the repair? Go to Step 13 Go to Step 11 11 Inspect for a bent water pump shaft. Refer to Go to Step 13 Go to Step 12 12 Inspect for bent or cracked brackets. Go to Step 13 Go to Diagnostic 13 Operate the system in order to verify the repair. System OK Go to Step 3
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
2: This inspection is to verify the condition of the drive belt. Damage may of occurred to 4: Misalignment of the pulleys may be caused from improper mounting of the accessory 5: Inspecting the pulleys for being bent should include inspecting for a dent or other damage 6: Accessory drive component brackets that are bent or cracked will let the drive belt fall 7: Inspection of the fasteners can eliminate the possibility that a wrong bolt, nut, spacer, or 13: The inspection is to verify the drive belt is correctly installed on all of the drive belt 14: The installation of a drive belt that is too wide or too narrow will cause wear on the 15: This inspection is to verify the drive belt is not contacting any parts of the engine or Step Action Yes No DEFINITION: The drive belt falls off the pulleys or may not ride correctly on the NOTE: Refer to Belt Dressing Notice .
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
1 Did you review the drive belt symptom Go to Step 2 Go to Symptoms 2 If diagnosing excessive wear, proceed to If diagnosing a drive belt that falls off, Did you find the condition? Go to Step 3 Go to Step 4 3 Install a new drive belt. Refer to Drive Belt Go to Step 4 System OK 4 Inspect for misalignment of the pulleys. Go to Step 12 Go to Step 5 5 Inspect for a bent or dented pulley. Go to Step 12 Go to Step 6 6 Inspect for a bent or a cracked bracket. Go to Step 12 Go to Step 7 7 Inspect for improper, loose or missing fasteners. Go to Step 8 Go to Step 9 8 1. Tighten any loose fasteners. Refer to Fastener Tightening Specifications. 2. Replace improper or missing fasteners. Does the drive belt continue to fall off? NOTE: Refer to Fastener Notice . Go to Step 9 System OK 9 Test the drive belt tensioner for operating Go to Step 11 Go to Step 10 10 Replace the drive belt tensioner. Refer to Drive Go to Step 11 System OK 11 Inspect for failed drive belt idler and drive belt Go to Step 12 Go to Diagnostic
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
DRIVE BELT TENSIONER DIAGNOSIS 12 Operate the system in order to verify the repair. System OK Go to Step 2 13 Inspect the drive belt for the proper installation. Go to Step 16 Go to Step 14 14 Inspect for the proper drive belt. Go to Step 16 Go to Step 15 15 Inspect for the drive belt rubbing against a Go to Step 17 Go to Diagnostic 16 Replace the drive belt. Refer to Drive Belt Go to Step 17 - 17 Operate the system in order to verify the repair. System OK -
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Mechanical - 6.6L - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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