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DEFINITION: The following items are indications of drive belt vibration: The vibration is engine-speed related. The vibration may be sensitive to accessory load. 1 Did you review the drive belt symptom operation and perform the necessary inspections? Go to Step 2 Go to Symptoms 2 Verify that there is a rumbling noise or that the vibration is engine related. Does the engine make the rumbling noise or vibration? Go to Step 3 Go to Diagnostic 3 1. Remove the drive belt. 2. Operate the engine for no longer than 30- 40 seconds. 3. Repeat this test if necessary by removing the remaining belt(s). Does the rumbling or vibration still exist? IMPORTANT: If the engine has multiple drive belts, remove Go to Symptoms Go to Step 4 4 Inspect the drive belts for wear, damage, separation, sections of missing ribs, and debris build-up. Did you find any of these conditions? Go to Step 7 Go to Step 5 5 Inspect for severe pilling of more than 1/3 of the drive belt pulley grooves. Did you find severe pilling? Go to Step 6 Go to Step 7 6 1. Clean the drive belt pulleys using a suitable wire brush. 2. Reinstall the drive belts. Refer to Drive Belt Replacement - Accessory or Air Conditioning Compressor Belt Replacement. Did you correct the condition? Go to Step 8 Go to Step 7
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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 7 Install a new drive belt. Refer to Drive Belt Replacement - Accessory or Air Conditioning Compressor Belt Replacement. Did you complete the replacement? Go to Step 8 Go to Step 9 8 Operate the system in order to verify the repair. Did you correct the condition? System OK Go to Step 9 9 Inspect for improper, loose or missing fasteners. Did you find any of these conditions? Go to Step 10 Go to Step 11 10 1. Tighten any loose fasteners. Refer to Fastener Tightening Specifications. 2. Replace improper or missing fasteners. Did you complete the repair? NOTE: Refer to Fastener Notice . Go to Step 13 Go to Step 11 11 Inspect for a bent water pump shaft. Refer to Water Pump Replacement . Did you find and correct the condition? Go to Step 13 Go to Step 12 12 Inspect for bent or cracked brackets. Did you find and correct the condition? Go to Step 13 Go to Diagnostic 13 Operate the system in order to verify the repair. Did you correct the condition? System OK Go to Step 3
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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. 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
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
body while the engine is operating. There should be sufficient clearance when the drive belt Step Action Yes No DEFINITION: The drive belt falls off the pulleys or may not ride correctly on the pulleys.DEFINITION: Wear at the outside ribs of the drive belt due to an incorrectly installed drive belt. NOTE: Refer to Belt Dressing Notice . 1 Did you review the drive belt symptom operation and perform the necessary inspections? Go to Step 2 Go to Symptoms 2 If diagnosing excessive wear, proceed to step 13. If diagnosing a drive belt that falls off, inspect for a damaged drive belt. Did you find the condition? Go to Step 3 Go to Step 4 3 Install a new drive belt. Refer to Drive Belt Replacement - Accessory or Air Conditioning Compressor Belt Replacement. Does the drive belt continue to fall off? Go to Step 4 System OK 4 Inspect for misalignment of the pulleys. Did you find and repair the condition? Go to Step 12 Go to Step 5 5 Inspect for a bent or dented pulley. Did you find and repair the condition? Go to Step 12 Go to Step 6 6 Inspect for a bent or a cracked bracket. Did you find and repair the condition? Go to Step 12 Go to Step 7 7 Inspect for improper, loose or missing fasteners. Did you find loose or missing fasteners? Go to Step 8 Go to Step 9 8 1. Tighten any loose fasteners. Refer to Fastener Tightening Specifications. NOTE: Refer to Fastener Notice .
2008 Hummer H2 2008 ENGINE Engine Mechanical - 6.2L - H2
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