80 tdi alternator belt keeps shredding!

[wesgt]

It's done this 4 times in the last 3 months, i've replaced the alternator pulley, and the larger pulley connected to the crankshaft, although that came off a 99 passat, could it be causing the problem? Also changed the housing with the shaft that the belt runs on also!

[Bowie69]

Could be the bearings in the alternator seizing?

[wesgt]

Someone mentioned that actually! Might just track down an alternator!

[wesgt]

Would there be play visible in the alternator?

[caterpillar]

have a look at the pulley i front of the engine..... its loose, or damaged, or they doest'n, line up, if not the belt will last very short....

[Bowie69]

A disconnected alternator should spin pretty freely, if the bearings are on the way out they will grumble and generally not feel nice when you pin it.

[wesgt]

Ok I will check out all of those things, thanks

[sam80quattro]

pretty sure the tensioners are prone to fail/collapse and cause this issue

[kulster]

The tensioner usually fails