Water pump on my 1983 300CD was leaking coolant from the weep hole so I'm in the process of swapping it out with an OEM water pump. During re-installation, I noticed that the pulley that attaches to the water pump and cooling fan rubs against the crankshaft dampener during test fit. I believe the pulley is pushed completely onto the boss of the water pump and I don't think I bent it during removal. Any thoughts on why I'd suddenly have a collision between water pump pulley and crankshaft dampener? Thanks.