So tell me why I shouldn't use worm drive clamps with silicone heater hose?

Discussion in '80-Series Tech' started by tominboise, Nov 10, 2005.

  1. tominboise

    tominboise

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    Can someone advise me as to why I shouldn't use a stainless worm drive clamp on the 5/8" silicone heater hose I am using for my PHH? Just wondering the pro's and cons.....

    Thanks, TOm
     
  2. Hayes

    Hayes

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    Something to do with thermal expansion of the clamp.

    Apparently the silicone doesn't like to seal itself to the metal, and even the tiniest change in the clamp pressure will let it leak.

    Somehow the fancy clamps counteract this.

    Hayes
     
  3. MaddBaggins

    MaddBaggins Remember the KnightRider!

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    Worm drive can loosen up with vibration and temp change. Since the PHH is a beehatch to get to using constant torque is a good idea. That being said, I did mine with worm drive but will be redoing that job with the greenstripe kit soon. :cheers:
     
  4. Houston FZJ80

    Houston FZJ80

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    Especially if the worm drive clamp isn't sleeved, the notches will cut into the surface of the hose compromising the outer structure... probably not catastrophically, but if you are going to the length of putting silicone on, you at least should get sleeved worm gear clamps.
     
  5. CruisinGA

    CruisinGA

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    Don't be afraid to tighten those clamps...

    silicone needs a lot of pressure to seal.
     
  6. fzj80kidpen

    fzj80kidpen

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    I have not done my PHH yet.
    So let me get this straight.
    55mm length
    Silicone with fancy clamps because silicone does not seal well
    or
    Greenstripe with sleeved worm clamp because is seals better
     
  7. Beowulf

    Beowulf

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    The fancy clamps are also sleeved.

    -B-
     
  8. SR.GRINGO

    SR.GRINGO

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    Does Napa carry the fancy clamps?
     
  9. Beowulf

    Beowulf

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    Mine did. They're called Stainless Constant Tension hose clamps. They should be able to look it up in their catalogs. They might have been in the Beck Arnley catalog but it's been 3 years and I can't remember. Someone posted the part numbers a few years ago. Do an Advanced Search on "Constant Tension" and see what you find.

    -B-
     
  10. tominboise

    tominboise

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    My local NAPA doesn't, hence my question. BTW, I have 16" of the fancy hose, which is 14" more than I should need, so let me know if anybody needs a PHH.

    Tom
     
  11. CruisinGA

    CruisinGA

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    Basically, you can ALWAYS use the nicer clamps, but not always necessary.

    There are three basic types of aftermarket clamps:
    Standard worm
    Sleeved worm (worm gear does not contact hose, neither do the perforations in the tightening band-keeps hose in better shape)
    Constant-tension (sleeved) worm

    Obviously there are the OEM-style clamps like spring ones and bolt-clamps. Not exactly commonly available (cept from the dealer=$$)

    You can use the constant tension with any type of hose, only necessary for silicone.

    In an ideal world, you would never use anything less than the sleeved worm drive. I tend to keep a box of these around, and change things out as I touch them for other reasons.

    Napa has all three.. Might have some trouble getting the constant tension, my Napa is pretty good (caters to shops/industrial) so they had them, and silicone hose.

     
  12. reffug

    reffug

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    Damn Bailey.................

    Shouldn't you be drinking.

    Nice call bro.
     
  13. CruisinGA

    CruisinGA

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    Just burnin studyin time until its drinkin time.... I think its gettin close to about that time. :grinpimp: :beer:
     
  14. fzj80kidpen

    fzj80kidpen

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    Hell its 5:00 somewhere in the world:)
     
  15. Rookie2

    Rookie2

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    IIRC, the ones from Napa were made by Breeze and say constant torque on the side. The little satelite Napa across the street didn't have them, but the bigger local distribution Napa did.

    :beer:
    Rookie2
     
  16. Cattledog

    Cattledog

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    BTW, for the Breeze constant tension clamps used in silicon hose applications, torque to 35 to 40 inch pounds. Don't over tighten them, it will defeat the spring loading in the clamp. Here is the email from Breeze. Torquing them correctly will avoid chasing down coolant hose leaks.

    email-

    Hello, I am replacing a bunch of heater hoses on my 1996 Toyota
    landcruiser. I bought Gates green Silicon hose and several BREEZE
    CONSTANT-TORQUE CLAMP part number CT-9410. To avoid leaks, what value in inch/pounds should I tighten the clamps to, using the silicon hose. The hose
    diameter is 5/8" and 1/2" id.

    response

    Hello Dave,

    Thank you for taking the time to visit our website. I asked one of our
    application engineers the answer to your request and his answer is as
    follows:

    Standard installation torque is 35-40 in-lbs

    Thanks again and have a nice day!

    Bethany Lezanic
    Senior Customer Service Rep.
    blezanic@hoseclamp.com
    724-639-3571


    Last there is another type of hose clamp avalible from gates. They are used in newer cars and are reusable. I really like this type. Thermoplastic Clamp Offers Maintenance-Free Hose Connection
    :beer:
     
  17. turbocruiser

    turbocruiser SILVER Star

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    Do constant tension clamps wear out or are they always as absolutely good as on day one??? I'm just wondering whether this is a spring type setup or what makes them able to expand and contract based on temperature and if whatever makes tham able to expand and contract eventually wears out???
     
  18. C6H12O6

    C6H12O6 SILVER Star

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    The "spring" in the Breeze constant tension clamps I used appears to be made up of a set of Bellville washers. They fit together back-to-front-to-front-to-back, etc.
     
  19. cruiserdan

    cruiserdan SupportingVendor Emeritus Moderator

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    Oh, really?
     
  20. cruiserman

    cruiserman

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    Green stripe hose & used Toy spring clamps, 40k miles and 4 years. No problems. It's not rocket science.
     
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