JPSC Forum

I saw that when the tension is too big,the cam belt goes to the motor,and when the cam belt tension is too low,it goes outside to the right side of the car.

1. Incorrect layout of pulley flanges *
2. Crank, cam, auxiliary driveshaft end float
3. Taper worn on crank nose pulley or cam pulley (s)
4. Cam nose length wrong (I have seen this once, fortunately before I fitted the cam)
5. Cam or crank pulley (s) not seating properly.
6. Cam pulley 'swashing' ie: cam nose not perpendicular to axis (bad grind) *
7. Badly worn tensioner bearings
8. Badly worn aux d/s or bearings especially the rear journal (shaft runs on a slant) *

* means I have actually seen belt wander & wear due to that cause.

As it happens it was the aux pulley, the way it was worn. A `new` second hand one has been fitted, with a guard on the backside. Belt now runs completely central on the pulleys.