Thanks, Ken. Sorry, I had forgotten that your prior emails had mentioned this.
You were correct all along, my inlet barb is 5/8", per the factory setup. When I changed my impeller 2 months ago (on the hard), I pulled only one hose off to be able to maneuver the pump into position to remove the (stuck) impeller. I thought it was the inlet one, but it was actually the outlet. I had a vivid memory of seeing (and measuring) the 7/8" barb, but it was the outlet barb that I had seen, not the inlet.
One other comment, which I'm sure is going to get you saying "I told you so," I was very unimpressed with the condition of the pump housing. It was in a fully unopened box with blue plastic protectors in the threads and over the flange, but the flange end had some significant dings in it. It shocked me enough that I snapped a picture. I don't think these dings would affect performance, but it still gives a very poor impression of quality. In the two pics below, you'll see the new pump with dings, and then my old pump with pristine flange section. [EDIT: These dings actually give the impression that this pump might have been (abused and) returned before, and then re-packed in a fresh box by Westerbeke. Not sure, but something must have caused those dings in the flange.]
Obviously my original intent to have in immediate drop-on replacement is not going to work out. I did get to do some sailing this weekend, but now the boat appears likely to have to go out of service while I work out this issue. It's frustrating, but I've also got a flaky depth sounder that I need to fix, so that would have been taking away from some sailing time anyway.
You were correct all along, my inlet barb is 5/8", per the factory setup. When I changed my impeller 2 months ago (on the hard), I pulled only one hose off to be able to maneuver the pump into position to remove the (stuck) impeller. I thought it was the inlet one, but it was actually the outlet. I had a vivid memory of seeing (and measuring) the 7/8" barb, but it was the outlet barb that I had seen, not the inlet.
Quote from: KWKloeber on May 28, 2018, 09:41:10 AMYes, this does appear to be an odd case. If the pump doesn't develop enough pressure to blow a seal (which makes sense, since I would expect the impeller fins would just start to bend and leak) and you haven't seen a defective pump before, then one way or another we're looking at a new first.
...In 30 yrs pf pumps, I have not seen a bad Sw pump out of the gate. By "bad", I don't mean "crap" (it is) I mean "defective."
I believe but have no numbers to back it up, that either pump won't develop enough pressure to blow a seal.
One other comment, which I'm sure is going to get you saying "I told you so," I was very unimpressed with the condition of the pump housing. It was in a fully unopened box with blue plastic protectors in the threads and over the flange, but the flange end had some significant dings in it. It shocked me enough that I snapped a picture. I don't think these dings would affect performance, but it still gives a very poor impression of quality. In the two pics below, you'll see the new pump with dings, and then my old pump with pristine flange section. [EDIT: These dings actually give the impression that this pump might have been (abused and) returned before, and then re-packed in a fresh box by Westerbeke. Not sure, but something must have caused those dings in the flange.]
Obviously my original intent to have in immediate drop-on replacement is not going to work out. I did get to do some sailing this weekend, but now the boat appears likely to have to go out of service while I work out this issue. It's frustrating, but I've also got a flaky depth sounder that I need to fix, so that would have been taking away from some sailing time anyway.