I have a KitchenAid dishwasher model KUDM24SEBL1. The wash arm upper bearing ring [9742946] had worn out. The lower ring was in good shape. I bought a replacement bearing ring, but when I reassembled the wash arm, etc., the unit still wobbled. There is an almost 1/4 in gap when the retainer nut is screwed down. I check the diagram and all the parts are there. why isn't it tightening down.

Water Inlet Valve

If the dishwasher is leaking water the water inlet valve might be defective. If the water inlet valve sticks open, it will allow water to fill the dishwasher continuously. Some customers report that they see clean water filling the bottom of the dishwasher after it's been sitting all night or for a couple of days. If this happens, turn off the water that is supplying the dishwasher. This is normally a valve under the kitchen sink. Then, replace the water inlet valve, it cannot be repaired. The water valve needs at least 20 lbs pressure to shut off properly. If your water pressure is to low replacing the valve may not solve the problem.

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Center Wash Arm Assembly

If the dishwasher is leaking water, the center wash arm assembly might be cracked or split. This can allow a jet of water to spray toward the door seal, causing a leak. If a crack or split in the center wash arm assembly is found, replace it. There isn't any glue that will hold the part together inside the dishwasher.

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Lower Wash Arm Assembly

If the dishwasher is leaking water the lower wash arm assembly might be defective. If the lower wash arm has a crack or split on the end, it can force water to spray directly toward the lower part of the dishwasher door. Then, the water can be forced under the door and onto the floor. Check the lower wash arm for any cracks or splits and replace it if necessary. Also make sure the screws are tight in the wash arm support. If the screws are loose, water can spray out the side of the pump and cause a leak.

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Upper Wash Arm Assembly

If the upper wash arm assembly is broken or cracked it can cause water to spray very forcefully toward the seams of the door, causing a leak.

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Door Seal

Every dishwasher door has a door seal. If the dishwasher is leaking water, it might be that the door seal is defective or worn out. Try closing the dishwasher door on a dollar bill and see if the door seal is making good contact all the way around the door. If not, replace the door seal. If the door seal is good or has been replaced and there is still a leak check the door hinges. If the hinges are bent the door will not close properly and the hinges will need to be replaced.

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Dishwasher Door Gasket

Every dishwasher door has a door seal. If the dishwasher is leaking water, it might be that the door seal is defective or worn out. Try closing the dishwasher door on a dollar bill and see if the door seal is making good contact all the way around the door. If not, replace the door sea