I understand that there are lots of previous questions on dishwashers not draining, my question is similar but not exactly the same. Note: I have disassembled this machine and found a small amount of cellophane around the impeller shaft. I removed that and though, "Yeah, got it, it will work fine". I reassembleded, and it appeared that draining was improved, the only water left was flush with the top of the inlet sump. I reassembled the entire unit and performed multiple rinse and hold cycles, the a wash cycle. It still leaves about .5 inches of water in the bottom. If left for a rew days it stinks, of course. Is water supposed to drain flush with the inlet or is that too supposed to be pretty much empty? The drain cycle is only 30 seconds. Is that too short or is the pump / impeller not doing it's job? I've checked the drain line and drain selonoid and the gate that changes position swith selenoid. How much is enough (drainage). Thanks for any assistance.

Thanks for that info. I still would like to know how much drainage is normal? Right now when I checked there is water visible only a couple inches away from the plastic sump cover, so it isn't a lot of extra water. If it would drain right to even with the inlet sump I wouldn't be able to see the water. Is that an adequate/or normal amount of drainage? What's the standard?

I will look into the piston nut assy. Thank you for that tip. I had this thing pulled out and disassembled for 4 weeks. I'm home alone while my wife is gone for 6 weeks so I can get buy with doing that. If she were here I wouldn't. It is all back together now but it looks like I will be seeing the underside of it once again. I did purchase a new sump inlet because the old one leaked after I pulled it and reinstalled.

Thanks Denman, I didn't know the name of the part when you pointed it out but after I looked it up I realized that I had removed that part and everything inside that could be removed, including the both racks. I pulled that piston / seal and checked it out. It does have a small hole build into the sealing area so it looks like that part is designed to leak a small amount. I can acquire and install a new one but the existing one moves freely and seems to seal pretty well, but it is 10 years old.

Would still like to know how much drainage is enough?
Thanks