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Thread: Pool pump is leaking!

  1. #1
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    Pool pump is leaking!

    The water is coming out from where the basket housing and pump meet. There are no bubbles in the line either in the suction or pressure end of the system.

    I thought it might be the seal assembly behind the impeller but I replaced the seal assembly and it's still leaking.

    I have no idea why it's still leaking. It could be that I didn't put the pump back together properly or it could be something else.

    Any help/input would be much appreciated.

    What I did (Hayward Super Pump):
    1. Took the impeller off.
    2. Removed the old seal.
    3. Installed the new seal.
    4. Screwed the impeller back on.
    5. Reattached the diffuser.
    6. Reconnected the pump to the basket housing.

  2. #2
    Mod Squad Bama Rambler's Avatar
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    Re: Pool pump is leaking!

    What brand and model pump is it?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  3. #3
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    Re: Pool pump is leaking!


  4. #4
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    Re: Pool pump is leaking!

    Is it leaking at the flange where the back plate mates the to the housing or where the motor connects to the backplate?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  5. #5
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    Re: Pool pump is leaking!

    Possibly both. Definitely from the motor to the back plate.

  6. #6
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    Re: Pool pump is leaking!

    That's got to be either the seal or a cracked back plate.
    The other is probably an o-ring or cracked back plate.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  7. #7
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    Re: Pool pump is leaking!

    Here are some pics.

    I don't think it's a cracked back plate as it doesn't look cracked anywhere. The seal is brand new. So I don't think it could be the seal.

    I guess it could be the o-ring but that wouldn't explain the leak between the motor and the back plate.








  8. #8
    Mod Squad Bama Rambler's Avatar
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    Re: Pool pump is leaking!

    If it's not a cracked plate then it has to be the seal. I'd take it back apart and inspect everything to make sure it's put together correstly and nothing is wrong with it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  9. #9
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    Re: Pool pump is leaking!

    I've done so 3 times and noticed nothing but I'll try again.

    It's odd though. The water seems to be coming from inside the motor. Is it possible that there's a leak behind the back plate?

  10. #10
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    Re: Pool pump is leaking!

    Are you sure it's not the discharge leaking and running down the back of the pump?
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  11. #11
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    Re: Pool pump is leaking!

    I'm positive. With the amount of water coming out some of it would have to be spilling down the basket housing. Also that area isn't wet.

    Is it possible that I ruined the seal enough to make it completely ineffective in the process of installing it?

  12. #12
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    Re: Pool pump is leaking!

    Yes, it is possible. How do the faces of the seal look? They should be completely free of any imperfections.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  13. #13
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    Re: Pool pump is leaking!

    The faces of the seal look fine. No visible damage but it's possible that the surface is wavy.

    I went to my local pool store and the people there said that opening the pump up after installing the new seal ruined the seal and I have to put a whole new one in. It is true that it started leaking more after I opened it up to check the new seal. However, I opened it up again only because it was still leaking.

  14. #14
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    Re: Pool pump is leaking!

    Opening it shouldn't have damaged it further but anything is possible.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  15. #15
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    Re: Pool pump is leaking!

    I took their advice anyway and bought another seal and put it in just now. It's still leaking. I also noticed some water coming out the rear vent of the pump. So now there's water coming out of the front side vents and the rear vents as well as the bottom. I'm at a loss.

    I think the pump is done. I'll call Hayward and see if they'll give me a new one. If not, I'll have to buy a new pump

  16. #16
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    Re: Pool pump is leaking!

    I'm betting it's something besides the seal. I still lean toward the plate being cracked or a thru bolt not being sealed.

    It's pretty easy for water to run down the motor casing and run out the back of the motor.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  17. #17
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    Re: Pool pump is leaking!

    Before I proceed, thanks for all your help so far. I really appreciate it.

    First, I'm guessing by back plate you mean the motor mounting plate? If so, I can try replacing that. I don't see any cracks but I guess it could be so fine that it only opens up under pressure. I really don't want to buy a whole new pump ($700)...

    Second, how bad would it be to let it run even though it's leaking? I need to get my pool clean and clear by July 2nd...

    Thanks again.

  18. #18
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    Re: Pool pump is leaking!

    As long as it's not leaking badly and it's operating properly then, except for a little water loss, there's no reason you can't run it.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

  19. #19
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    Re: Pool pump is leaking!

    I'd say upwards of 500 gallons a day (8 hours) at it's current rate. As much as a 1000 gallons if my estimate is too conservative. It's definitely flowing, not dripping.

    I just read on google that if you run your pump with a non-functioning seal that the motor bearing will corrode. If the seal is working and it's leaking from somewhere else, the motor bearing should be fine right? I don't mind if the consequence is just water loss but if it's going to damage the bearing or other parts...

  20. #20
    Mod Squad Bama Rambler's Avatar
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    Re: Pool pump is leaking!

    Any time there's water leaking out the back of the casing there's a possibility of runing the bearings and/or the motor.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 1.5hp Dynamo pump. 24" Pentair Sand Dollar Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit
    You can stop SLAMing your pool when you pass the OCLT (You lose 1ppm or less FC overnight, & You have .5ppm CC's or less) & your water is clear.

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