DRIVE BELT FALLS OFF DIAGNOSIS
Diagnostic Aids
If the drive belt(s) repeatedly falls off the accessory drive pulley(s), this may be caused by pulley misalignment.
An extra load that is quickly applied or released by an accessory drive component may also cause the drive belt
(s) to fall off. Verify that the accessory drive component(s) are operate properly.
If the drive belt(s) is the incorrect length, the drive belt tensioner(s) may not maintain the proper tension on the
drive belt(s).
Test Description
The number(s) below refer to the step(s) in the diagnostic table.
Does the engine still make the vibration?
Diagnosis and Correction
Go to
Step 4
4
Inspect the drive belt(s) for wear, damage, debris
build-up and missing drive belt ribs.
Were any of these conditions found?
Go to
Step 5
Go to
Step 6
5
Install a new drive belt. Refer to
Drive Belt
Replacement - Accessory
or
Drive Belt
Replacement - Air Conditioning
.
Did you complete the replacement?
Go to
Step 11
-
6
Inspect for incorrect, loose or missing fasteners.
Were any of these conditions found?
Go to
Step 7
Go to
Step 8
7
1. Replace the incorrect or missing fasteners.
2. Tighten any loose fasteners. Refer to
Fastener Tightening Specifications
.
Were the fasteners replaced and/or tightened?
Go to
Step 11
-
8
Inspect for damaged fan blades or a bent fan
clutch shaft.
Did you find and correct the condition?
Go to
Step 11
Go to
Step 9
9
Inspect for a bent water pump drive shaft.
Did you find and correct the condition?
Go to
Step 11
Go to
Step 10
10
Inspect for a bent or cracked accessory drive
bracket(s).
Did you find and correct the condition?
Go to
Step 11
-
11
1. Clear any codes.
2. Run the engine in order to verify the repair.
Does the vibration still exist?
-
System OK
2004 Chevrolet Corvette
2004 ENGINE PERFORMANCE Engine Mechanical (Introduction) - 5.7L - Corvette
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December-24-07 10:50:10 AM
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