- Vibration depends on engine speed.
- Vibration may be dependent on the load of the accessories.
Diagnostic Information
Engine vibration can be caused by accessory drive components. It is recommended to pay attention to the following - excessive freon charge in the air conditioning system, sticking in the power steering system or filling the system with the wrong fluid, additional load on the generator. To help identify intermittent or spurious situations, vary the loads on the accessory drive components.
Description of the test
The numbers below refer to the operations in the diagnostic table:
2. This test is done to check for the presence of vibration during diagnosis. Other vehicle components, such as the exhaust system or transmission, can also cause this symptom.
3. This test helps determine if vibration is caused by the drive belt or accessory drive components. Remove the drive belt and run the engine for a few seconds, this will help determine if the vibration is related to the drive belt or not. Without a drive belt, the water pump will not work and the engine may overheat. Diagnostic Trouble Codes may also be activated (DTC), if the engine is running without a drive belt.
4. The vibration may be caused by the drive belt. Removing the drive belt provides the best conditions for inspecting its condition.
6. Inspection of fasteners will help eliminate the possibility of incorrectly installing a bolt, nut, gasket, or washer.
8. This step should only be performed if the fan is belt driven. Inspect the engine cooling fan for bent, deformed, loose or cracked blades. Check the fan clutch for smooth rotation. Inspect for bent fan shaft or mounting flange.
9. Check if the water pump drive shaft is bent. Also check the water pump bearings for smooth rotation and no excessive play. Compare the water pump to a known good water pump.
10. Accessory drive brackets that are bent, cracked, or loose fasteners can place extra stress on the accessory drive, causing it to vibrate.
| Step | Operation | Values | Yes | No |
| 1 |
Have you read the diagnostic information Symptom - Engine Mechanical and performed the necessary inspections?
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-
|
Go to operation 2
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Go to item Symptoms - Engine Mechanical
|
| 2 |
Verify that vibration is caused by engine operation.
Does vibration occur when the engine is running?
|
-
|
Go to operation 3
|
Go to Diagnostic Information
|
| 3 |
Does the vibration still continue when the engine is running?
|
-
|
Go to Diagnosis Start - Vibration Diagnosis and Troubleshooting in Vibration Diagnosis and Troubleshooting
|
Go to operation 4
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| 4 |
Inspect the drive belt for wear, damage, dirt build-up and missing ribs.
Have any of these conditions been found?
|
-
|
Go to operation 5
|
Go to operation 6
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| 5 |
Install a new drive belt. See Section 1C1, Engine Mechanical - FAM II 2.4D.
Has the replacement been made?
|
-
|
Go to operation 11
|
-
|
| 6 |
Inspect for correct installation, looseness and/or missing fasteners.
Have any of these conditions been found?
|
-
|
Jump to Operation 7
|
Jump to operation 8
|
| 7 |
Replace inappropriate and/or missing fasteners. Tighten loose fasteners. See "Fastener tightening specifications"in this section.
Have fasteners been replaced and/or tightened?
|
-
|
Go to operation 11
|
-
|
| 8 |
Check for damage to the fan blade or bent fan clutch shaft.
Fault found and corrected?
|
-
|
Go to operation 11
|
Go to operation 9
|
| 9 |
Check for bending of the water pump shaft.
Fault found and corrected?
|
-
|
Go to operation 11
|
Jump to operation 10
|
| 10 |
Inspect Bracket (s) drive accessories for cracks and bends.
Fault found and corrected?
|
-
|
Go to operation 11
|
-
|
| 11 |
Does the vibration still persist?
|
-
|
-
|
System OK
|