Timing Belt Automatic Tensioner

Metal Contamination and Oxidation
Causes:
- Contact with contaminating components: oil, dust, leakage of coolant
Actions:
- Remove leakage of coolant
- Remove leakage of oil and/or fuel
- Replace the faulty/damaged component

Broken Central Pin
Causes:
- Incorrect setting of the bolt: the torque applied is higher than the value specified on the maintenance sheet
Actions:
- Apply the correct tightening torque
- Use the torque wrench
- Replace the faulty/damaged component

Broken Stop Contact
Causes:
- Incorrect setting of the tensioner: “excessive unload” condition with the belt excessively slack in the transmission
- Incorrect setting of the tensioner: “excessive load” condition with the belt tensioned in the transmission
Actions:
- Replace the components when the engine is cold
- Apply the correct tension to the belt
- Check the alignment of the reference indexes
- Check the belt tension after the adjustment turns
- Use the tensiometer to check the belt tension
- Replace the faulty/damaged component

Broken Stop Contact / Dents on the End Stop
Causes:
- Incorrect setting of the tensioner with loss of capacity to modulate and compensate the belt tension variations
Actions:
- Replace the components when the engine is cold
- Apply the correct tension to the belt
- Check the alignment of the tensioner reference indexes
- Check the belt tension after the adjustment turns
- Replace the faulty/damaged component
Auxiliary Belt Automatic Tensioner

Irregular Opening of the Aluminium Case From the Loading Arm
Causes:
- High stress
- Load peaks from the belt
- Misalignment
- Binding of the component or other elements in the transmission
Actions:
- Use a belt with the correct length for the transmission
- Check the alignment between the pulleys
- Check the condition of the other components (damper and freewheel)
- Replace the faulty/damaged component

Metal Contamination and Oxidation
Causes:
- Contact with contaminating components: oil, dust, leakage of coolant
Actions:
- Remove leakage of coolant
- Remove leakage of oil and/or fuel
- Replace the faulty/damage component

Broken Stop
Causes:
- Sharp blow due to accidental uncoupling during the installation and/or replacement stage
Actions:
- Replace using appropriate tools
- Replace the faulty/damaged component
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