I have the same washer and the same noise. It runs fine and it doesn't do the popping noise every time. I have looked behind it with cover off, not with it running, and there is no sign of a drip or leak, no rusty water signs. Very clean for it's age. A repairman I asked about it once told me it was the flat washer on the pulley. To take out bolt, flip flat washer over and reinstall. He said it was cupped and caused the noise but I was afraid I might make things worse so I just left it. Mine has been making the noise 7 or 8 years. I even thought it might be a shock I'm hearing. Either way, it's been a good washer. 16 years old and I had the door switch/ board replaced during first year warranty. Not another problem other than this noise, but if it quit tomorrow I couldn't complain.