Driving the 83 300cd last week when a noticable clanking from the front end could be heard while driving ,pulled the vacuum pump off today and found that the bearings that surround the roller on the armiture were missing .These are about half the size of a bee bee guns and theirs 12 bearings in all .Changed the oil with no bearings coming out during the service .Do the bearings hold a threat to damaging the motor? Is this area were the chain resides.