Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 6 of 6

Thread: Silicone sealant under lip of new shaft seal?

  1. Back To Top    #1
    CajunGuy's Avatar
    Join Date
    Apr 2016
    Location
    Louisiana
    Posts
    303

    Silicone sealant under lip of new shaft seal?

    Maybe I'm over thinking this...but from everything I've researched, this seems like a 50/50 opinion type of thing. What's you guys opinions? To me it seems like the sealant would be beneficial because it will prolong water from getting under the lip and behind the seal. Just need to be careful not to get any on the face of the seal.
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
    Dolphin S200 Pool Cleaner
    Main Filter Pump - 1.5HP Pentair Whisperflo connected to Triton II Sand Filter
    Spa Pump - 2HP Pentair Whisperflo w/ 2HP Polaris Spa Air Blower
    Resilience PSC3 SWCG

  2. Back To Top    #2
    CJadamec's Avatar
    Join Date
    Apr 2016
    Location
    Quaker Hill, CT
    Posts
    2,192

    Re: Silicone sealant under lip of new shaft seal?

    Where is the fifty fifty opinion coming from? What sources did you find that sealant is a good thing for a shaft seal. The lip seal on the shaft is designed to be able to move on the shaft. As soon as the seal moved, and it will, the sealant will no longer seal the lip seal.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

    Photos of 2016 Build, Inside Your Breaker Panel, Free Copy of 2017 NEC code
    TFP is AD Free and is funded solely by member support click here to help

  3. Back To Top    #3
    CajunGuy's Avatar
    Join Date
    Apr 2016
    Location
    Louisiana
    Posts
    303

    Re: Silicone sealant under lip of new shaft seal?

    Quote Originally Posted by CJadamec View Post
    Where is the fifty fifty opinion coming from? What sources did you find that sealant is a good thing for a shaft seal. The lip seal on the shaft is designed to be able to move on the shaft. As soon as the seal moved, and it will, the sealant will no longer seal the lip seal.
    Maybe I'm confused, but the shaft on my WhisperFlo motor slides right through the spring side of the seal that is seated in the middle of the seal plate. Are you telling me that both sides of the seal spin once the pump is turned on? When looking at my setup, it seems like the spring side lodges on the seal plate and wouldn't move, only the shaft would spin inside it. Again, not really sure how it works, I thought only the white ceramic side seated in the impeller spun.

    Read this thread Step 8 Pentair Whisperflow seal replacement How-to (w/ photos))
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
    Dolphin S200 Pool Cleaner
    Main Filter Pump - 1.5HP Pentair Whisperflo connected to Triton II Sand Filter
    Spa Pump - 2HP Pentair Whisperflo w/ 2HP Polaris Spa Air Blower
    Resilience PSC3 SWCG

  4. Back To Top    #4
    CJadamec's Avatar
    Join Date
    Apr 2016
    Location
    Quaker Hill, CT
    Posts
    2,192

    Re: Silicone sealant under lip of new shaft seal?

    Ceramic spins. Carbon doesn't spin. Carbon on the shaft is spring loaded and will move slightly as the shaft floats on its bearings and undergoes thermal expansion. It's not the seal moving so much as the shaft moving realative to the seal. At best silicone will do nothing at worst it will cause the seal to leak or fail premature.
    Chuck-
    15x30 AG, Pentair Superflo VS, 19" sand filter, TF-100 test kit
    Aqua Comfort ACT750 heat pump / 6x20 ground mount solar panel / DIY automation

    Photos of 2016 Build, Inside Your Breaker Panel, Free Copy of 2017 NEC code
    TFP is AD Free and is funded solely by member support click here to help

  5. Back To Top    #5
    CajunGuy's Avatar
    Join Date
    Apr 2016
    Location
    Louisiana
    Posts
    303

    Re: Silicone sealant under lip of new shaft seal?

    Quote Originally Posted by CJadamec View Post
    Ceramic spins. Carbon doesn't spin. Carbon on the shaft is spring loaded and will move slightly as the shaft floats on its bearings and undergoes thermal expansion. It's not the seal moving so much as the shaft moving realative to the seal. At best silicone will do nothing at worst it will cause the seal to leak or fail premature.
    Thanks for great explanation man! I'll leave it off!
    15k Gallon In Ground Saltwater Gunite Pool and Spa w/ Overflow
    Dolphin S200 Pool Cleaner
    Main Filter Pump - 1.5HP Pentair Whisperflo connected to Triton II Sand Filter
    Spa Pump - 2HP Pentair Whisperflo w/ 2HP Polaris Spa Air Blower
    Resilience PSC3 SWCG

  6. Back To Top    #6
    mas985's Avatar
    Join Date
    May 2007
    Location
    Pleasanton, CA
    Posts
    11,984

    Re: Silicone sealant under lip of new shaft seal?

    On some pumps, the ceramic is in the seal plate and does not move while the carbon spins.
    Mark
    Hydraulics 101; Pump Ed 101; Pump/Pool Spreadsheets; Pump Run Time Study; DIY Acid Dosing; DIY Cover Roller
    18'x36' 20k plaster, MaxFlo SP2303VSP, Aqualogic PS8 SWCG, 420 sq-ft Cartridge, Solar, 6 jet spa, 1 HP jet pump, 400k BTU NG Heater

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •