So I have replaced the crank pulley on my 94 ls400 with a low mile unit, replaced the idler and tensioner pulleys. If the car idles, no issues. Light load it will slowly derib belt, if its a heavy load it will eat through the belt in nothing flat.
It isn't throwing the belt but chewing it up rib by rib.
Anyone have any ideas?
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One of the pulleys or other driven devices is not in alignment.
There is some item that is within the belt path that is contacting the belt and chewing it up. Have a pic of the past belts and the missing ribs? As well a side shot?
That's significant enough that if one or more of those is not in spec or installed in reversed that it will cause the wear mentioned. Make sure that any washer/s are in correct order and there are not two stacked.
I had a customer not 2 years ago had the same problem and I replaced the water pump assy bracket that runs the fan clutch and the problem went away.I found that when the rpm went up the fan clutch support bearing would distort and if you look closley you can see the belt start to jump back toward the motor but at low rpm the belt will center itself and run smooth. hope this helps