Coolant Overflow Hose

Discussion in 'General Maintenance/Repair Questions' started by dtfeld, Dec 5, 2019.

  1. dtfeld

    dtfeld Water Contrails GOLD Sponsor

    Jun 5, 2016
    Milton, GA
    410 Sundancer
    Axiom 12 MFD
    Cat 3126 V-Drives
    Redoing a Westerbeke generator (7.6 BTD). Old coolant overflow line was mashed onto the barbs and is stiff, brittle and discolored. Parts manual does not list the material or diameter.

    It looks like 1/4" ID. Can I use clear PVC? Rubber? What is the correct size and material for coolant over flow lines?
  2. Carpediem44DB

    Carpediem44DB Well-Known Member PLATINUM Sponsor

    Aug 18, 2015
    Sanfransico Bay area
    2006 44 DB Sedan Bridge Raymarine gs165 w Quantum HD Radar
    Achilles 350 Dink
    Nick Jackson Davit
    Cummins QSC 8.3 500 HD
    I'd say yes, Nothing special about the overflow line. I'd use Tygon hose as it is pretty resistant to chemicals.
  3. Skip Boyer

    Skip Boyer Active Member

    Sep 24, 2015
    North Carolina
    1998 500DA Sundancer, 1999 Maxum 2800, 1998 270 Sundancer, Oliver Hazard Perry FFG-7
    Twin Detroit 6V92TA
    I use clear hose on all my overflows. Boat, truck, equipment, etc. The overflow hose is typically only in use when the system needs to relieve some pressure. My theory is that with the clear hose at least some droplets of coolant will remain in the hose and be visible for inspection after shutdown. Just a quick glance at a clear hose may indicate a growing problem. Just my 2 cents.
    dtfeld likes this.
  4. JVM225

    JVM225 Well-Known Member GOLD Sponsor

    Apr 8, 2008
    Farmingdale, NY
    2002 410 Sundancer, Monaco Edition.
    3126 Cats.
    I’ve always just used a piece of fuel line when I had to replace one.
  5. hottoddie

    hottoddie Well-Known Member

    Jan 11, 2012
    Boston/Cape Cod
    1986 Sea Ray 390 EC
    Garmin 4212 Chartplotter
    Garmin 24 HD Radar
    Garmin 546s Plotter
    454 Crusaders
    Totally agree with all above. Nothing special about the overflow hose.

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