Help With Expansion Tank Hoses Please??

Discussion in 'Speed Triple' started by Shaun Lee, Jun 17, 2020.

  1. Shaun Lee

    Shaun Lee Member

    Oct 17, 2019
    16
    8
    Manchester
    #1 Shaun Lee, Jun 17, 2020
    Hi Guys/Gals

    I have a 2002 Speed triple and cannot find this info in the manual or on line, the coolant expansion tank under the riders seat has 2 small hoses connected to it, one comes from the radiator cap flange but the second hose is just hanging free, is this correct? I though it was a pressurized system and that any excess coolant will be returned to the radiator?
     
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  2. capt

    capt Elite Member

    May 8, 2016
    3,051
    750
    western Australia
    #2 capt, Jun 17, 2020
    Yes , that's normal . the hose that hangs free is to vent excess coolant if some cluster f#*k put's far too much water/coolant in the system !
     
    • Agree Agree x 1
  3. Red Thunder

    Red Thunder Crème de la Crème

    Dec 2, 2014
    2,034
    1,000
    High Wycombe
    #3 Red Thunder, Jun 17, 2020
    The coolant in the radiator is pressurised, as pressure builds excess passes through to the expansion tank.
    As it cools, the pressure drops and shrinks being refilled by the coolant in the expansion tank

    If the valve fails, pressure passes to the coolant tank and any excess coolant is vented through the drain tube to vacate at the bottom of the bike...

    Like my bike did here:
     
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  4. Rocker

    Rocker Elite Member

    May 1, 2016
    1,662
    800
    Suffolk
    #4 Rocker, Jun 17, 2020
    Not good
     
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  5. Shaun Lee

    Shaun Lee Member

    Oct 17, 2019
    16
    8
    Manchester
    #5 Shaun Lee, Jun 17, 2020
    Cheers, so I assume the upper/higher hose is the runoff and the lower hose comes from the radiator?
     
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  6. Shaun Lee

    Shaun Lee Member

    Oct 17, 2019
    16
    8
    Manchester
    #6 Shaun Lee, Jun 17, 2020
    Great thanks, my hose was at the top of the engine so poured hot coolant all over my engine...
     
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  7. Red Thunder

    Red Thunder Crème de la Crème

    Dec 2, 2014
    2,034
    1,000
    High Wycombe
    #7 Red Thunder, Jun 17, 2020
    I cant remember the routing of the hoses.
    next time I take the seat off I will take a peak and photo if I remember
     
    • Agree Agree x 1
  8. Shaun Lee

    Shaun Lee Member

    Oct 17, 2019
    16
    8
    Manchester
    #8 Shaun Lee, Jun 17, 2020
    Thanks, I guess it must be the lower one that goes to the radiator or any liquid in there would just drain out onto the floor making it empty all the time.
     
    • Agree Agree x 1
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