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#1 | ||
Starter Motor
Join Date: Aug 2015
Posts: 7
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I recently had a mechanic tell me that it is impossible to over-tighten a hose clamp so much that it could cause a flange to break. This was after they replaced the radiator hose in my car, and the flange on the thermostat housing broke off (see pic.)
Seems unlikely to me, what do you think? Cheers. |
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#2 | ||
Cabover nut
Join Date: Aug 2015
Location: Onsite Eastcoast
Posts: 10,827
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I've broken a few new hose clamps over tightening. SS, mild steel.
Broken a alloy pipe flange under it over tighening one as well. New stuff seems to be chinese junk.
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#3 | ||
FF.Com.Au Hardcore
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Location: Riff
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it would depend what you did it up with. A phillips head screwdriver will only let you go so far, but a 7-8mm socket can go a lot harder.
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#4 | |||
Moderator
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Posts: 18,528
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Quote:
But care should be taken not to overtighten hose clamps, otherwise they may fail too. |
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#5 | ||
Mopar! But Own F6's..
Join Date: Dec 2005
Location: F6DELAIDE
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Do you use coolant? Is it the proper ford coolant?
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#6 | |||
FG XR6 Ute & Sedan
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Quote:
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regards Blue Last edited by aussiblue; 18-01-2019 at 02:24 PM. |
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#7 | ||
Starter Motor
Join Date: Aug 2015
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#8 | ||
Starter Motor
Join Date: Aug 2015
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#9 | ||
FG XR6 Ute & Sedan
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Yes; plastic deforms then breaks.
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regards Blue |
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#11 | ||
Banned
Join Date: Jul 2018
Posts: 256
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Always used TRIDON clamps. They don't cut into the hose like some other brands.
Should always be done up with an 8mm 1/4 drive until the worm drive binds. If reusing an old hose either switch the drive around 180 degees or trim if excessively swollen. |
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#12 | ||
Giddy up.
Join Date: Dec 2004
Location: Kramerica Industries.
Posts: 15,620
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Hose clamp's should never be done up tight, let alone super tight.
Just firm, if the correct hose is used and in new condition then the clamp should only be firmly done, if you over tight them then you run the risk of future leaks. The clamp should be just positioned on the far side of the ridge on a housing and done firmly, people often over tighten clamp's thinking the tighter the better but in actual fact you squeeze/squash the hose and cause leaks. |
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#13 | ||
FG XR6 Ute & Sedan
![]() Join Date: Oct 2006
Location: Bibra Lake WA
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It's also good practice to put a thin layer non hardening gasket goo around inside of the hose end far enough to go past that ridge. It helps the hose slip on and prevents leaks by filling any nicks, dents and casting imperfection in the fitting it's going on. It was normal procedure when I first started working on cars and was even prescribed in various factory workshop manuals but seems to fallen out of favour in recent decades. I usually use this: https://www.permatex.com/products/ga...ealant-liquid/
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regards Blue |
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#14 | |||
FF.Com.Au Hardcore
Join Date: Jul 2005
Posts: 559
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Quote:
Modern manufacturing techniques have reduced the variation so it is no longer a problem (in modern countries). The tolerances they make stuff to nowadays is amazing in comparison to back then, unfortunately others things have also progressed - we also now know how to make something last *exactly* 3 weeks longer than the warranty... |
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#15 | ||
FF.Com.Au Hardcore
Join Date: Jul 2011
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Plastic coolant flanges go brittle with heat and age so it is possible that over tightening the hose clamp could cause this.
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#16 | |||
FG XR6 Ute & Sedan
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Quote:
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regards Blue Last edited by aussiblue; 19-01-2019 at 12:53 PM. |
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#17 | ||||
FG XR6 Ute & Sedan
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Location: Bibra Lake WA
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What Gates says at https://www.gatesaustralia.com.au/~/...april-2015.pdf :
Quote:
And Supercheap https://www.supercheapauto.com.au/bl...ator-hose.html : Ok I know SC are not always the best place for tech advice. Quote:
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regards Blue Last edited by aussiblue; 19-01-2019 at 01:22 PM. |
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#18 | ||
FG XR6 Ute & Sedan
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Typically cast parts also have a joint ridge where the two parts of the mold join running the length of the pipe fitting on both sides like on this apparently OEM BA Falcon thermostat upper housing
![]() from ebay https://www.ebay.com.au/p/BA-BF-Falc...Ltd/1171348148 Sealant will help seal the hose there. Even plastic parts often have these mold join lines e.g.: https://www.ebay.com/p/Coolant-Coole...18/23014214355 Ditto with this Ford OEM FG one albeit the the ridge looks smaller and smoother except on the underside outer lip and look at the lump there https://www.ebay.com.au/itm/GENUINE-...H0-:rk:43:pf:0 So more precision hmmm? Perhaps we've gone full circle and the focus on cost of parts rather than quality means the use of sealants on coolant hose will be back in fashion again.
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regards Blue Last edited by aussiblue; 19-01-2019 at 01:41 PM. |
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#19 | ||
FF.Com.Au Hardcore
Join Date: Jul 2005
Posts: 559
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No one has said sealant is a bad idea, combined with tightening firm, it is a rock solid combination
The old gasket goo / aviation cement #3/4 use to be top shelf of every tool box, that's not the case any more. regarding quality, (as with many things - including hose clamps) you usually get what you pay for, I wouldn't use no name brand hose clamps or thermostat housings - cooling and oil systems are too important. |
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#20 | ||
FF.Com.Au Hardcore
Join Date: Feb 2005
Location: Sth Coast NSW
Posts: 1,512
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Well you won't overtighten a spring/constant tension clamp.
![]() IMO they are better than the screw drive clamps. Anyone have any negatives/bad experiences with them? - apart from getting them off, which is usually because of not using the correct tool. |
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#21 | ||
FG XR6 Ute & Sedan
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I prefer this type of stainless T bolt hose clamp but there is probably even more chance of over-tightening and breaking something.:
![]() I find the spring/constant tension clamps lose tension with age.
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regards Blue Last edited by aussiblue; 20-01-2019 at 12:18 AM. |
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#22 | ||
FF.Com.Au Hardcore
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#23 | ||
*barks incessantly
Join Date: Jun 2016
Location: SA
Posts: 1,554
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You can definitely over-tighten a hose clamp on a car which has plastic inlet/outlet pipes on the radiator. With heat cycles and age the plastic gets brittle and it's not uncommon to see them collapse. I don't reckon it would even be that hard to crush a brand new plastic hose if you got a bit over-excited and kept tightening it.
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#24 | |||
FF.Com.Au Hardcore
Join Date: Jan 2005
Posts: 3,131
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Quote:
I think if someone doesn’t have the ‘feel’ for tighten a conventional clamp with a ratchet, then they should probably leave the job for someone else. When I was an apprentice at a truck shop we were Iveco service agents. Probably the worse built trucks with more PD issues than anything else. Around ten years ago the NZ fire service ordered some 80 Euro cargos, which ****ed coolant out of nearly every hose. I was sent to where they were kitted out for a week to seal up all the hoses with that aviation sealer... I can still remember what it smells like and it took about one week for it to run off my skin but it did the job. |
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#25 | |||
Cabover nut
Join Date: Aug 2015
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Quote:
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heritagestonemason.com/Fordlouisvillerestoration In order that the labour of centuries past may not be in vain during the centuries to come...... D. Diderot 1752
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#26 | ||
FG XR6 Ute & Sedan
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The heat shrink (e.g. Gates Powergrip) ones never seen to have caught on here like they did in the US. https://www.youtube.com/watch?v=4O91YqHbp8c
Anyone ever used them or found them in a production car here?
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regards Blue |
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#27 | |||
BA/F6 BF/F6 SSV/R TTG
Join Date: Mar 2007
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Quote:
Over tightening will be a contributing factor but not the main cause
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#28 | |||
Cabover nut
Join Date: Aug 2015
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Quote:
"Honey did you bring your 12v hair dryer."
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heritagestonemason.com/Fordlouisvillerestoration In order that the labour of centuries past may not be in vain during the centuries to come...... D. Diderot 1752
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#29 | ||
FG XR6 Ute & Sedan
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The other issue with cast aluminium is that the cooling and/or quench cycles ( see http://www.themetalcasting.com/alloy-cooling-rate.html etc) can have an impact on both the strength of the product and the susceptibility to fracturing so the skills, experience, quality controls and cooling technology employed in the casting factory/foundry will be a factor. Where castings are left to air cool on racks, or cooled with blown ambient air even very variable ambient temperature or climatic location of the factory site may also be a factor (perhaps sometimes the sub zero sometimes in some Chinese factories V generally much warmer Kilkenny Castings in South Australia).
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regards Blue |
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#30 | |||
FG XR6 Ute & Sedan
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Quote:
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regards Blue Last edited by aussiblue; 20-01-2019 at 02:54 PM. |
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