Lucerne V6-3.8L VIN 2 (2006)
Drive Belt: Testing and Inspection
Drive Belt Vibration Diagnosis
Drive Belt Vibration Diagnosis
Diagnostic Aids
The accessory drive components may have an affect on engine vibration. An overcharged air conditioning (A/C) system, a power steering system
restriction, or the incorrect fluid, or an extra load placed on the generator are suggested items to inspect. To help identify an intermittent or an
improper condition, vary the loads on the accessory drive components.
Test Description
The number(s) below refer to the step(s) in the diagnostic table.
2. This test is to verify that the vibration is present during diagnosing. Other vehicle components may cause a similar symptom such as the exhaust
system, or the drivetrain.
3. This test is to verify that the drive belt or accessory drive components may be causing the vibration. Remove the drive belt and operate the engine
for a few seconds, this will verify if the vibration is related to the drive belt or not. With the drive belt removed the water pump will not operate
and the engine may overheat. Also diagnostic trouble codes (DTC's) may set when the engine is operated with the drive belt removed.
4. The drive belt may cause a vibration. While the drive belt is removed this is the best time to inspect the condition of the belt.
6. Inspection of the fasteners can eliminate the possibility that a incorrect bolt, nut, spacer, or washer was installed.
8. This step should only be performed if the fan is driven by the drive belt. Inspect the engine cooling fan for being bent, twisted, loose or having
cracked blades. Inspect the fan clutch for smooth operation. Inspect for a bent fan shaft or bent mounting flange.
9. Accessory drive component brackets that are bent, cracked, or loose may put extra strain on that accessory component causing it to vibrate.
