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Thread: Can't seem to solve Whisperflo pump leak

  1. Back To Top    #1

    Join Date
    Apr 2014
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    United States
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    Exclamation Can't seem to solve Whisperflo pump leak

    Hi,

    A few weeks ago, I replaced the motor on my Whisperflo pump with a new Century motor -- the pump seal was busted, leading to a bad bearing, and I was unsuccessful this time in replacing the bearing on the old motor (rusted bolt).

    Within minutes of putting the new motor in commission, I started getting a drip/dribble of water from the bottom of the new motor's housing. The pool store guy suggested running it for a day to see if it cleared itself up. It didn't.

    Yesterday, I replaced the pump seal again, and turned it on this morning, and the same thing happened -- within a minute of priming, I've started to get a continuous drop of water out of the bottom of the motor housing.

    The first seal came from the pool store, the second one from Amazon, different brands, so it's not a bad batch of seals or something like that.

    What could I be doing wrong?

    Here's my procedure:

    -- Remove seal plate and motor from main pump housing
    -- Removed the diffuser
    -- Removed the impeller
    -- Removed the seal plate from the motor
    -- Used a flat-head screwdriver to remove 1/2 of the seal from the impeller.
    -- Did the same to remove the other half from the seal plate (popping it out from the back, easy peasy)
    -- Cleaned the recesses on the impeller and seal plate using a toothbrush, wiped dry
    -- Greased the sides and back of both parts of the seal with a small amount of silicone grease
    -- Both times, I've been *very* careful not to let anything touch the front of either half of the seal.
    -- Pushed new seal into the impeller and seal plate (both times, getting it to seat in the impeller took considerable force, as in, hammering through a folded clean cloth. The seal plate side was easy, using a clean PVC fitting and a few light taps of a hammer).
    -- Re-assembled seal plate, impeller, and diffuser.
    -- Tested impeller by rotating it a tiny bit to ensure it bounced back. The first time I did this on the *second* seal, the impeller would not turn freely, so I disassembled and found the ceramic part on the impeller was not seated all the way. I hammered it in more and reassembled and it worked fine.
    -- Replaced funnel-looking deal, greased seal plate gasket and diffuser o-ring and ensured they were in their places.
    -- Reconnected motor assembly to pump housing, tightening bolts using an X pattern.
    -- The second time, I waited 24 hours before filling the pump with water and turning it back on. The first time, I didn't.

    This isn't my first rodeo -- I've replace the seals at least twice before that I recall, replaced the motor before (same as this new motor, a B2854), and even replaced the bearings in the old motor. As before, I'm following the directions on both YouTube videos I've found (from Wet Head Pool Supply and YourPoolHQ) and the directions in the Whisperflo manual.

    Any help would be greatly appreciated!

  2. Back To Top    #2

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    Jun 2015
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    Wildomar, California
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    Re: Can't seem to solve Whisperflo pump leak

    But did you replace the seal plate gasket?

  3. Back To Top    #3

    Join Date
    Apr 2014
    Location
    United States
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    Re: Can't seem to solve Whisperflo pump leak

    Yes, I got a "go kit" from the pool store the first time around and replaced both the diffuser o-ring and the seal plate gasket. The second time, I just re-greased them and ensured they were seated correctly.

    That said, the leak is coming from *behind* the seal plate -- water is dripping through the motor housing, not from between the seal plate and the volute.

  4. Back To Top    #4

    In the Industry

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    Mar 2015
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    Houston, Texas
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    14

    Re: Can't seem to solve Whisperflo pump leak

    Did you replace the tiny o-ring that goes around the impeller screw? Had the same issue a few months back. If its a new pump seal with a new motor (assuming the motor shaft is not bent), then my next guess would be that impeller o-ring

  5. Back To Top    #5

    In the Industry

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    Jun 2015
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    Wildomar, California
    Posts
    423

    Re: Can't seem to solve Whisperflo pump leak

    Richard; just want to be through. If it's for sure coming from around the motor shaft then; seal is no good, seal surfaces are not clean, motor not installed correctly, seal plate cracked, motor shaft not straight, or impellor warped or crooked, motor not bolted up completely. It's one of these.

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