I started to have some issues with my old Nissan water pump (which had a small leak because the seal broke apparently) and have always used Nissan water pumps but decided to try something different on this timing belt interval as it was already coming up. I used a Gates timing belt and tensioner along with a Gates water pump. The timing belt and tensioner component kit works great, I can't ask for more and it saved me a good chunk of cash. The water pump however decided to crap out on me in less than 5000 miles. I guess I got a bad one?
Removing the water pump and alternator v-belt makes the noise go away. I had a rebuilt alternator that failed on me as well so I used a good known alternator (which is a fresh rebuilt I will be replacing later) that was bench tested and half of the terrible noises went away but it did not make this noise. Here is the video when I changed the alternator with a good one:
http://www.youtube.com/watch?v=syrzQWHnCjU
As you can see the pulley is a little shaky and the pump is making some terrible bearing noises but it is not leaking.
Is it possible to replace the water pump without removing the timing belt? If not can I re-use the timing belt and tensioner? This timing belt has less than 5000 miles on it as it was done when the pump was replaced. I already ordered a new Nissan water pump because I know it is proven to last at least a while before needing to be replaced.
To answer some questions...
No, I never run straight water in my cooling system.
No, my fan clutch is not shot and has zero play.
No, the belts were never over-tightened.
As you can see I am pretty much screwed here. No doubt I am going to have to drain the radiator and while I am at it any coolant recommendations are welcome.