Hi, long time lurker, first time poster.

Truck - 2004 Silverado LT 3500 6.6 Type 1 105amp alternator 130,000 miles or so

I have an issue that just does not make any sense.

I had a noise coming from one of the idler pullers (this LB7 has two) about two months ago. I ordered a new tensioner puller and two idler pulleys, replaced all three, I did not replace the serpentine as it had only 10,000 miles or so.

A month later the serpentine belt is shredding.

Replaced belt.

New belt shredded.

Replaced belt.

New belt shredded. Compared old tensioner pulley to the new tensioner pulley, the new pulley was about 1mm narrower.

Bought new pulley and replacement belt. Put on new belt.

Drove 100 mile round trip. (98.7)

Parked truck in driveway.

Started truck, backed out of driveway.

Battery indicator came on, message on readout Battery Not Charging.

Pulled back into driveway, popped hood. Belt popped off of power steering pulley. Belt has nicks and tears.

Bought new tensioner assembly and have a new belt.

Replaced tensioner assembly, put on new belt.

Bumped the engine a few times, belt popped off of the power steering pulley.

When I look at the belt routing everything is in line with the exception of the power steering pulley. The belt is in perfect alignment with everything else, but it is half on and half off of the power steering pulley.

the first photo is the proper routing for my LB7.

the second photo is the tensioner, alternator and air-conditioning pulleys.

the third shows the alternator, air-conditioning and power steering pulleys with the belt in alignment but half off the power steering pulley.

belt_route.jpg

20160722_110412.jpg

20160722_110351.jpg


I have NOT touched the power steering, how in the heck can it be out of alignment?