Timing Belt: Testing and Inspection

TIMING BELT INSPECTION

Caution in handling





1. Do not bend in less than 20 mm in radius.





2. Avoid twisting or kinking the belt and keep it free from water, oil, dust and other foreign matter.

Visual check





1. The belt must be replaced if cracks or lacerations are found in the side and rear faces.





2. replacement is necessary when abnormal wear is found in the side face.





3. Replacement is necessary when belt fabric is found to be cracked or disintegrated.





4. Replacement is also necessary when cogs are found to have abnormal wear.





5. Take measurements at 3 - 5 points around the circumference of the belt The belt must be replaced even if a single measurement is beyond the limit.

Limit of rubber hardness - 90 (HS)

TIMING PULLEY AND TENSION SPRING INSPECTION

Visual check
^ Crankshaft pulley
^ Camshaft pulley
^ Oil pump pulley
^ Idler pulley

If uneven wear, cracks or wear exceeding the limit are found in the pulley, replace it with a new one.








Timing pulley outside diameter








Tension pulley outside diameter
1. Check the roller for excessive wear and damage.
2. Check to see that the roller rotates smoothly.
3. Check to see that there is no play in the pulley shaft/fixing plate sealing area.








Tension spring tension
If the set length or set force is out of the specified range, replace the tension spring with a new one.