Timing belt failure symptoms, causes and corrective actions

The main job of the timing belt is to connect the crankshaft to the camshaft. The crankshaft controls the engine's pistons while the camshaft opens and closes the valves. The timing belt helps to control the timing of these components ensuring optimal engine performance.

A broken timing belt can cause catastrophic engine damage, therefore it is vital to keep the timing belt in good operating condition. Check the belt during routine maintenance and always ensure that the belt is changed at the manufacturer's recommended change intervals.
Also, proper tools need to be used to remove and install these pulleys. - See more at: http://staging.gatesi.prd.reference.be/en/problem-diagnosis/accessory-drive-system/oap-function-tests#sthash.bxyPeK6z.dpuf
Also, proper tools need to be used to remove and install these pulleys. - See more at: http://staging.gatesi.prd.reference.be/en/problem-diagnosis/accessory-drive-system/oap-function-tests#sthash.bxyPeK6z.dpuf
Also, proper tools need to be used to remove and install timing belts.

If a belt does fail prematurely, it is important to determine why it failed so that corrective action can be taken. In most cases, the cause of the failure is to be found in a problem with one of the drive components.

HOW TO SPOT AND CORRECT TIMING BELT PROBLEMS?

When diagnosing serpentine belt problems, use the following troubleshooting methods to resolve the problem: - See more at: http://staging.gatesi.prd.reference.be/en/problem-diagnosis/accessory-drive-system/micro-v-belt-wear-symptoms#sthash.WF3iA4GB.dpuf
When diagnosing timing belt problems, use the following troubleshooting methods to resolve the problem:
Problem_Diagnosis_361x323_Timing_Belt_Tensile_Failure

1. Tensile failure

Probable causes: Foreign body in drive; Excessive installation tension; Belt crimped due to improper handling.

Corrective actions: Ensure cover is correctly fitted; Install at correct tension; Observe handling instructions.

Problem_Diagnosis_361x323_Timing_Belt_Tooth_Shear

2. Tooth shear

Probable causes: Low tension; Seizure of driven part; Misalignment.

Corrective actions: Install at correct tension; Eliminate cause; Correct aligment.

Problem_Diagnosis_361x323_Timing_Belt_Tooth_Wear

3. Tooth wear

Probable causes: Incorrect tension; Worn pulley(s).

Corrective actions: Install at correct tension; Replace pulley(s).

Problem_Diagnosis_361x323_Timing_Belt_Hollowed_Teeth

4. Hollowed teeth

Probable causes: Extremely low tension; Loss of tension during running.

Corrective actions: Install at correct tension; Ensure tensioner screws are tight.

Problem_Diagnosis_361x323_Timing_Belt_Back_Cracks

5. Back cracks

Probable causes: High temperature; Low temperature; Back idler is worn out.

Corrective actions: Eliminate cause of high/low temperature; Replace back idler.

Problem_Diagnosis_361x323_Timing_Belt_Land_Wear

6. Land wear

Probable causes: Excessive tension; Rough pulley(s).

Corrective actions: Install at correct tension; Replace pulley(s).

Problem_Diagnosis_361x323_Timing_Belt_Oil_Contamination

7. Oil contamination

Probable cause: Oil leak.

Corrective action: Replace faulty oil seals.

Problem_Diagnosis_361x323_Timing_Belt_Edge_Wear

8. Edge wear

Probable causes: Damaged flange(s); Misalignment.

Corrective actions: Replace pulley(s); Correct alignment.

Problem_Diagnosis_361x323_Timing_Belt_Noise

9. Belt noise

Probable causes: High tension; Low tension; Misalignment; Damaged flange(s).

Corrective actions: Install at correct tension; Correct aligment; Replace pulley(s).