[papason]

I have a 91 century that had me saying the ecact same things. I had repalced the water pump about a month ago and thought it died (cause that happens to me with rebuilts). I had the same clank and could confirm that it was the balancer because could see the rubber was cracked and broken away from the hub. Sounds like it is not the water pump but the balancer. I have never heard a water pump make as much racket as my balancer did. What is the sound like when it is running? if it sounds pretty solid and metalic and is it worse at idle? or different gear? mine got bad in reverse. These dont point to the water pump but probably to the balancer. was not a hard job realy. Had to borrow a puller and had trouble finding the threaded holes to use but, comes off and goes back on pretty easy. But that was mine in a 91 3300. I think you have the 3800 like my 98 lesabre seems like it looks pretty similar but not sure right now.