My Whirlpool dishwasher does not always clean well. I suspect the spray arms are not rotating. When I quickly open the door, while running, I see no evidence of the arms moving. I can hear the water gushing inside but don't think the spray arms are moving. I did replace the lower rack on this unit a while back. How much of a gap should there be between the lower rack and the lower spray arm? I see a gap of about 3/4" between the rubber bellows and the tube that directs the water to the upper spray arm.
I suspect its not sealing well enough to create the required pressure to spin the arms. I was going yo try to bypss the switch on the door in order to see more closely to what is happening but that may get messy in the kitchen.

Any Ideas on the gap for the bellows?

Dishwasher has been in use since 1992. On average it gets used twice a week if that.
Maybe it's time for a new one? LOL!

Fixed it.
I will answer my own question and hope someone down the road finds this helpful.

Turns out the problem was the gasket below the drain cover in the pump assembly. The parts diagram does not show a gasket and there was no gasket on my unit. So I thought. When I received my gasket kit, and no instructions, there was a gasket in the kit that I did not find in my pump. But upon taking a much closer look, I could see a residue under the drain cover and assumed it was just a white soap scum residue. It looked like a white powder dried up in the shallow channel below the drain cover. The extra gasket in the kit fits pefectly. The gasket is a thin plastic type of foam. Apparantly it must have just disintegrated over the years and disappeared down the drain. Essentially this caused the pump to not build enough pressure, like an internal leak. See, these are the things they don't tell you. I can't believe this information was not available. I even purchase a service manual for this unit and there is no mention of this gasket. Crazy I tell you. A $10.00 seal kit part# 675703 fixed it. Now that I know what the problem is I could fix it in less tha 30 minutes. It was so simple a caveman could have done it. And to think I was getting ready to go by a new dishwasher as it's approaching 20 years old. It pays to not subscribe to this throw away world. What do you think it would cost to bring this thing to the dump? They charge you to throw your shit away you know.

Thanks for listening.