Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Hi, my name is***** will be assisting you.
The only problem with what you are saying is that both of the augers pieces should be turning at the same time so that they would never contact each other. The only exception to this would be if the shear pin for one of then has broken and fallen out which would explain the augers getting together and would also cause the one to not turn like it should and the other one would contact it and make the bang noise that you are hearing. Take a close look to make certain that the shear pins are in both of the augers.
Even if the are touching each other you should never hear a noise because they turn at the same time so they would never rub together. They may be rubbing something else however because it sounds like one or the other could be bent. Take a close look across the bottom of the blower and see if it looks like something has been rubbing, you should see the paint rubbed off.
If you can take a picture and attach it to your comment it might be helpful.
After looking at your pictures I can't see anything that looks like it would be making a noise. I can make one other suggestion and this is to have someone else help you if possible. Have someone start and engage the auger system as if you were going to blow snow with it while you stand out front of the machine and watch to see if you can tell more about what is making the noise. The auger blades themselves both turn at the same time since they are both attached to the same shaft they can't physically rub together to make a banging noise unless the shear pin is missing in one of them and we have already determined that this is not the case on your machine. The only other spot that looked like a rub to me was at the intake of the fan to the lower right but it might have been oxidation or salt residue I couldn't make it out really well.
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