Crankshaft Pulley bearing/bushing?

[strikker22]

I overheated the engine and had to take off the head and have it machined. Mean while i replaced the water pump and belts as suggested by the mechanic that was helping me do the work. after getting it put back together and driving it for a few months or less the water pump and alternator belts (one or the other) started tearing apart and shredding the other one. I thought maybe it was just because I had, in an effort to be cost effective, bought the cheap (and I don't mean inexpensive, I mean "cheap") belts. So I after replacing them 2x under the warranty bought the Gates belts and they seem to be holding up much better. But after the second time the cheap belts broke I started watching the crank pulley while the engine was running and noticed it wobbling slightly. My mechanic friend suggests the bearing on the pulley is worn out so i ordered a new pulley (UD) but it does not have any type of bearing. I have been doing some serious research and have found nothing about any bearing/bushing on the pulley or the end of the crankshaft. Any help or suggestions are greatly appreciated. Thinking maybe my crank bolt is worn or something along that line, so I will be replacing the bolt also.

 

[96 420a-t]

It is a press fit install and the bolt doesn't wear. You should be ok to reuse it

 

[Shake_Zulla]

A bearing on the crank pulley would make no sense because the crank needs to turn the pulley. A bearing would let the crank spin free of the pulley like an idler pulley. I see you have a Chiltons guide there be sure to follow the recomendation for installing the pulley and the torque spec. Broken belts are the result of two things, worn pulley's and misalignment. Gates is one of the leaders in belts and belt drives systems so their belts will last longer but it still sounds like something is out of alignment. If both belts are failing chances are its the crankshaft pulley so be sure to install your new one properly and good job buying a new bolt. Oh yeah by the way looks like you got an underdrive pulley so you will need to buy smaller belts. Sorry for writing a book.