Author Topic: top hose collapsing  (Read 3450 times)

kerby

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top hose collapsing
« on: 15:55, Sun 02 September 2007 »
just brought a 5 gt, when engine is revved top hose collapses on the rad side but expands the other side of the stat next to water pump and brass bleed screw. HELP!!!!!  :(

jure

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« Reply #1 on: 07:16, Mon 03 September 2007 »
Cheapes replacment for small hose with bleed screew is to take same diameter pipe and cut it on lenght little more longer than original one. You need to bend it but it will loose diameter and flow efficiency somwhere around middle. On that place you put one metal clip and tight hose to retun on original round shape. Worked on mine over half of year and I manage to degass water system numerous times without any problems.

Your problem can be just poor hose clips or your head gasket is cracked betwwen pistons and water inlets or outlets and due to that compressed air is forced into water system and, naturally, it blows pipes off :?

5teve L

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Re: top hose collapsing
« Reply #2 on: 10:21, Mon 03 September 2007 »
Quote from: "kerby"
just brought a 5 gt, when engine is revved top hose collapses on the rad side but expands the other side of the stat next to water pump and brass bleed screw. HELP!!!!!  :(


Sounds like the hose is prob a bit old & worn, get another standard one or it's an excuse to put some nice silicone ones on ;)

kerby

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« Reply #3 on: 17:00, Mon 03 September 2007 »
Cheers fellas the ole chap thinks its the head gasket gone (bllx) but ill try a new hose first  :x

laura

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« Reply #4 on: 12:40, Tue 04 September 2007 »
hard metal shiney chrome pipes are always good for replacements as well, they dont expand like rubber/silicone pipes which leads to easyer flow, i know hard pipes are much better for boost ones than silicone.
hope ya pipe works and its not a head gasket altho head gasket on a renny isnt to bad.

hope you get on well    :D

ben 5

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« Reply #5 on: 18:49, Tue 04 September 2007 »
the top rad hose is ment to compress under reving the engine as the water pump sucks the water from the bottom hose and  the top hose sucks in as coz of the thermostat restricting the flow changing to a solid pipe would cause it to suck in elsewhere and could result in air lock
they came out of the factory like that
one careful lady owner
never raced or rallied!

kerby

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top hose
« Reply #6 on: 19:58, Wed 05 September 2007 »
hiya everyone jst to let you all know that ive taken the thermostat out of the top hose and there is no collapse or expand and the rad seems to be working a hell of alot better cheers all :D

5teve L

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« Reply #7 on: 20:50, Wed 05 September 2007 »
Stick a new one in there though or it will cause more probs than before  :wink:

laura

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« Reply #8 on: 09:23, Thu 06 September 2007 »
yeah dont run with no thermostat its not good to run to cold can cause more problems

 :D

James5

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« Reply #9 on: 11:48, Sun 16 September 2007 »
Never run the GTT without a  :x Therm Stat sounds like the stat is in the wrong position should be inside the main top water hose touching the water pump when pipe connected properly and yes the pipe will collapse and when coolant is up to temp the stat should open and the pipe will expand again.

I would do the following :
1) Buy new stat,
2) Fit it correctly loose in hose to start and feel with fingers on outside that it is against the water pump and then tighten up the 2 x jubilee clips, ( 1x clip on the stat and the 2nd on the water pump connection of hose).

:)

kerby

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« Reply #10 on: 19:10, Sun 16 September 2007 »
ok brill wat sort of problems would it cause?? i will chuck a low temp stat in it

James5

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« Reply #11 on: 22:50, Sun 16 September 2007 »
Quote from: "kerby"
ok brill wat sort of problems would it cause?? i will chuck a low temp stat in it


What do you mean please elaborate??

5teve L

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« Reply #12 on: 08:33, Mon 17 September 2007 »
It will run to cold in winter, the stat is there to get the car up to operating temp you see, it will also cause 'cavitation' which i believe is air pockets in the water, obviuosly both aren't good.

Goran

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« Reply #13 on: 08:45, Mon 17 September 2007 »
Just an addition... "cavitation" is uncontroled turbulent fluid flow around the blades of any sort of "turbine"- or "propeller"-like device (like a water pump e.g.)... it causes the tips of the blades to become "eaten away" with time, which in turn causes more (damaging) turbulent flow and poor efficiency of the device - water pump in this case...
Thermostat has the role of correcting the fluid flow around the waterpump as well, so it reduces the possibility of cavitation...