Field Remedy: 1463
| Subject: | Toothed belt diagnosis - Possible causes and remedys |
|---|
| Models: | Engines: | Option: |
|---|---|---|
| All | All |
| Complaint: | |
|---|---|
| Cause: | |
| Production: |
Remedy:
Excessive drive noise from toothed belt drive (picture I)
Problem and cause: Remedy:
Side tension too high Adjust to correct tension - belt whines / squeals
Side tension too low Adjust to correct tension -belt strikes against cover
___________________________________________________________________________
Excessive adge wear (picture II)
Problem and cause: Remedy:
Belt not running parallel to axis Align correctly and impacting against flanged pulley
Deflective flanged pulley Replace sprocket
Gearwheel misalign Align correctly - belt cannot run true
___________________________________________________________________________
Excessive fabric wear at base (picture III)
Problem and cause: Remedy:
Side tension too high Adjust to correct tension
Belt operating in excessive heat Identify problem and recify
Worn sprocket Replace sprocket
___________________________________________________________________________
Tooth flank wear / roof fractores and tooth shear (picture IV)
Problem and cause: Remedy:
Side tension too high / low, leading Adjust to correct tension to incorrect pitch ratios
Belt does not comply with permissible Replace sprocket length tolerance
Action of external media(e.g. oil) Identify problem and recify
Sprocket / pulley jammed Identify problem and recify
___________________________________________________________________________
Separation of teeth and fabric from belt body (tension member) (picture V)
Problem and cause: Remedy:
Fabric damaged during installation Fit new belts carefully
Action of external media Check cover if seated properly
___________________________________________________________________________
Damage on pulley side of belt (picture VI)
Problem and cause: Remedy:
Foreign object caught in belt drive Remove foreign object, check cover if seated properly
Damage to gearwheel teeth caused by Replace sprocket foreign object or installation tool
Belt damaged prior to / during Ensure proper installation installation
___________________________________________________________________________
Cracks in backing (picture VII)
Problem and cause: Remedy:
Exposure to excessive heat Identify problem and recify
Exposure to excessive low temperature Identify problem and recify
Action of external media Check cover if seated proberly
___________________________________________________________________________
Tearing of the belt (picture VIII)
Problem and cause: Remedy:
Foreign object caught in drive Check cover if seated properly
Action of external media Check cover if seated properly
Initial tension too high Adjust to correct tension
Belt crimped prior to / during Observe handling instruction installation
___________________________________________________________________________
Fault system component (picture IX)
Problem and cause: Remedy:
Bearing play Substitute idler pulley, tension coil and/or guide roller
Damaged bearing surface Substitute idler pulley, tension coil and/or guide roller
___________________________________________________________________________
Fracture on fixing spot tension coil-oil pump (1,4 - 2.2 litre engines) (picture X)
Problem and cause: Remedy:
Wrong torque of tension coil on Replace oil pump fixing spot of oil pump
Important:
- check the oil pump on each toothed belt check or each replace interval and each toothed belt damage for cracks (arrows).
| FunctionalGroup: | J - Engine |
|---|---|
| Complaint Group: | 01 - Broken or Cracked,05 - Excessive wear,14 - Noises or Vibrations,24 - Wrong or not mounted |
| Trouble Code: | Non |