Condition
| Cause
|
DEFINITION: The following
describes conditions of the timing belt you may encounter during inspection
and the possible causes.
Notice: Failure to follow the described timing belt inspection and maintenance
may result in a broken timing belt and cause severe engine damage.
|
Tooth is broken and/or tooth root is cracked
|
| • | Damaged camshaft/crankshaft oil seal and/or coolant leak |
| • | Tensioner not functioning properly |
|
Back surface of the belt is cracked/worn/scratched/scored
|
| • | Excessive cold starts |
| • | Interference with the belt cover |
|
Side of belt surface is worn
|
| • | Improper installation of the belt |
| • | Overload or misalignment of the cam drive components |
| • | Heavy thrust loading against the idler guide flanges |
|
Teeth are worn
|
| • | Poor belt cover sealing |
| • | Excessive belt tension |
| • | Rough and/or scored cam sprockets |
|
Clean break across fibers
|
| • | Kinked belt before and/or during assembly |
| • | Foreign material under the belt |
|
Oil/Coolant impregnated and/or swollen belt
|
|
