I’m in the middle of replacing the mechanicalseal on my Hayward SP1580 pump. When I installed the non-rotating ceramic half of the seal, I noticed that it did not completely bottom out on the flat seat of the housing. Lacks maybe 1/8." I tried lightly tapping it further down onto the flat ledge. but it did not move. Is this ok? Maybe the rubber cup portion of the ceramic disk actually makes the seal by gripping just the sides of the seating area? Help!
It should bottom out against the seal plate. Try wetting the rubber with water and then pressing down. You can also try some shaft seal lubricant.
It worked!. Thank you.
Great! Thank you for coming back and giving us an update.