Well there is no evidence of the ring turning in the bore , no scores or scratches and the original coating color is still undamaged.verify the accurate measurement of the inside diameter of the suction housing. older dominators were different. have run across berkeleys that have been machined out or spun the wear ring ring expanding the housing which should be obvious. pic and accurate measurement will determine.
Just to clarify this is a berkley pump not a dominator...HalIt appears as though you are trying to install a Dominator wear ring of the later generation pump with a 1" wear ring surface on the impeller in place of the old style wear ring with a 3/4" wear ring surface.
Do as Johnnyray said and measure the outside diameters of the two wear rings. This will help us help you. The older generation impellers had a wear ring surface of approximately 3/4". The later generation pump impellers have a wear ring surface of about 1"., The two rings are NOT interchangable.
Another thing that really muddies up the water is that Dominator at one time made a wear ring of the newer outside diameter that made the older style impellers fit in the new pumps. They also made a wear ring for the old pumps that would allow you to use the newer impellers in the older pumps.
This makes a total of 4 wear rings that look basically alike, but they do not all interchange.
If you want to give me a call, I can help you decipher what you have and need to do to make things work. 417-858-8616
Yes that is what I am saying, I think I need a shouldered wear ring( one with a thicker lip).great pics and good measurements. i believe your difference in clearances are coming from the thickness of the "lip" of your wear ring, some of the delrin liners were .250 think at the lip. take a depth measurement of the different wear rings from the height to the inside base of the lip and you will see the difference. the cure is to use the same type wear ring that you had, or cut the nose of the impeller to draw it closer or cut the shaft to let the impellor slide deeper into the wear ring.