Considerable water under pump housing...

[waste]

I feel stupid for thinking that different motors could affect the shaft seal. The shaft would have to be a particular size for a given pump model regardless of motor. Still, better to look foolish than run into problems once the thing is apart

On the pump model the problem is that there is no model number on the pump housing. There is only a small stamped plate that says hayward and is otherwise unreadable no matter how I shine light on it or try to take a rubbing of it with a pen and paper. The strainer cover does have sp-1600-D on it and the basket SP-1600-M and it does look like the super pump so I'm assuming it is a 1600 series super pump. Are these two item numbers enough to be able to determine what I need? I looked up the parts list at hayward for the spx 1600 and it suggests 1600 models were made as far back as the early 80s so it looks like this makes sense. Are the SPX and SP parts interchangeable or have there been significant changes made to 1600 models over the years?

When I put the motor back on how tight should I make the 4 screws? I don't have a torque wrench. Should I just hand tighten and then snug them 1/4 turn or should I give it more than that, say 1/2 turn? I have a feeling it is easy to crack the housing or seal plate if one goes crazy with it.

1 - don't feel stupid in asking that question - while it might make Eli Whittney shudder, it's not hard to imagine different motor manufacturers using different sized or threads per inch - all the pump maker would have to do is have a couple different impellers to match the threads on the motor they were mating with - but the pump manufacturers said 'this is our pump, make your motor match it or we'll find someone who will'

2 - SP 1600-T is the same as SPX1600-T the "X" is printed on the boxes and bags that replacement parts come in to the best of my knowledge (they have recently changed the mounting and matching seal plates - there is also the 2600 series which will take the 1600 gaskets). The diffusers are matched to the impeller/ motor HP - a larger HP impeller will not work in a difuser for lower HP.

3 - You would be hard pressed to crack the motor mounting plate by hand. If you use power drivers you can torque the bolt in enough to dig in to the plate, but that just makes it harder to get a grip on the bolt in the future. As a rule; tighten it enough to make it 'uncomfortable' to get more turn out of it with 2 fingers on the wrench.

If you go after the shaft seal, ask me and I'll tell you a little more about the change-out (or any one of a few dozen folks here could give you the same info) - make sure that you know how the 2 pieces are supposed to go on the impeller and into the sealing plate, or you'll be doing it again within a week.

Again good luck - if I can help more, just ask