I wonder if this is causing my truck to have a slight knocking noise, towards the rear of the motor.....the shop checked the injectors, valve lash, metal shavings in the oil....and found nothing. The next step is to tear into the motorwell mine kinda sounded like a small wire or something getting into the fan for a few seconds then it got real loud. It sounded like i stuck a piece of steel into a fast moving fan blade enough to make it start to stop or slow down, then i lost all forward moving ability. It was just like being in nuetral and reving the motor with no power to the tranny. This all took place in maybe 3-5 seconds, i shut the truck off and coasted to a stop. I tried to fire it up but it was dead. I could hear something kinda grinding or ratteling when i cranked it, so i quit trying that LOL.
And no you cant drive with it broken, well if its brfoken completely out like mine was anyway. If its just cracked then you might be able to drive it until it dies like mine did.