Specifications
Cause:
When cold, the pointer on the tensioning pulley no longer
points to the mark and strikes the cold stop after each combus-
tion cycle (hence the noise).
Solution:
Opel/GM speciies a special process for setting the tension
when a timing belt is changed: When tensioning, turn the ad-
justing cam counterclockwise (to the left). Rotate the timing
belt 2x by hand with fully tensioned tensioning pulley. Only after
this has been done is the tension to be set by turning the cam
to the right to the “new” mark. This must be done to ensure
that the timing belt is properly seated in the pulley.
Full stop setting
Pointer position too low
Final setting
CT 870 K1, CT 873 K1, CT 975 K3
Opel 1.4/1.6/1.8/2.0 16V
ContiTech Technical Info 29
Installation tip – tensioning pulley
Problem:
The tensioning pulley makes noises after operating for a certain amount
of time. In subsequent operation, the arrester can break and the belt
loses its tension. As a rule, this results in damage to the engine!