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TYMA CZ
belts and
transmission systems
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Causes of Failure of Timing Belts and the Solution

Running noises from belt

Diagnosis Solution
Tension too high: Belt whines, whistles Adjust tension properly
Tension too low: Belt knocks against covering Adjust tension properly

Edge wear

Diagnosis Solution
Belt not parallel to axis: Belt runs against flanged pulley Check drive, line up or, if necessary, replace any non-aligned pulleys, change the belt
Wheels axially off-centre: Timing belt cannot be properly aligned Check drive, line up or, if necessary, replace any non-aligned pulleys, change the belt
Flanged pulley has flaws Replace idler/tensioning pulleys, change the belt
Bearing play in components Replace idler/tensioning pulleys, change the belt

Fabric wear in the tooth root

Diagnosis Solution
Belt excessively tensioned Change the belt, adjust tension correctly
Belt is overheating Find out cause (e.g. check cold performance), take corrective action, change the belt
Timing belt pulley is worn out Replace timing belt pulley, change the belt

Unacceptable wear of tooth flanks/base separating and tooth shearing

Diagnosis Solution
Tension too high/too low Change the belt, adjust tension properly
Trapped foreign matter Remove foreign matter, check covering is seated properly, change the belt
Jammed timing belt pulley or tensioning pulley Find out cause (e.g. defective bearing), take corrective action, change the belt

Teeth and fabric separating from belt body

Diagnosis Solution
Leaks in the engine or engine compartment (e.g. escape of oil, antifreeze etc.) Repair leak(s), change the belt

Running marks on teeth side

Diagnosis Solution
Foreign matter in timing belt drive Remove foreign matter, change the belt, check the cover is seated properly
Flaws in teeth of timing belt pulley caused by foreign matter or tools during fitting Replace timing belt pulley, change the belt, ensuring it is properly fitted
Timing belt damaged before/during fitting Change the belt, ensuring it is properly fitted

Cracks on back timing belt

Diagnosis Solution
Ambient temperature too high/low Find out cause (e.g. check cold performance), take corrective action, change the belt
Contact with foreign media Change the belt, check the covering is seated properly
Back idler pulley sluggish Replace pulley, change the belt
Ageing Change the belt

Timing belt snaps

Diagnosis Solution
Foreign matter in the drive Remove foreign matter/media, change the belt
Contact with foreign media Change the belt, check the covering is seated properly
Excessive tensioning Change the belt, adjust tension properly
Belt was crimped before/during mounting Change the belt and fit it correctly

Defective system components

Diagnosis Solution
Bearing play Replace the idler, tensioning and/or guide pulley
Damaged running surface Replace the idler, tensioning and/or guide pulley