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Thread: expansion tanks on disco 300tdi's

  1. 4th May 2006, 07:48 AM #11
    PhilipA
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    Just a comment on the pressure in cooling systems.
    My experience in Saudis Heat has suggested that the highest pressure in the cooling system is after the engine is turned off and heat soak sets in.

    The major reason for say 15lbs is to stop the system turning to steam around the combustion chambers once the circulation ceases. I doubt whether in a correctly operating cooling system that it gets anywhere near that while the engine is operating and the coolant is circulating.

    I remember one day ( probably 40-45c ambient) going to the Nissan dealer in my 1.5 Sunny to get a new exhaust ( which my son broke in half kangaroo hopping while I was teaching him to drive LOL).
    I was standing at the parts counter and looked outside to see the Sunny spewing its guts of water. Turned around and said , "and a radiator cap please."
    Never had any more trouble.
    Regards Philip A
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  2. 14th May 2006, 01:33 PM #12
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    cookiesa
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    Angry

    Had to run mine without the cap on fully to mine last year. loosen the cap then I taped it with some gaffa tape to stop it vibrating off. Worked a treat.

    The pressurisation of the system is to increase the boiling point of the water/coolant in the system. If everything is OK system doesn't need to be pressurised.

    This was due to a pinhole in a house. Under pressure it was spraying with reasonable force, without the pressure it was only trickling down the hose. Let me get to a auto parts shop where I could get another hose. (actually it was a hose part from a holden heater system) I was also concerned that with the force coming out of the hose was it going to split or cause more damage? Figured less pressure on soemthing that has already failed would be better.

    (Reminds me, must replace the temporay hose&#33
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  3. 15th May 2006, 06:31 PM #13
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    George130
    George130 is offline ForumSage
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    You can get low pressure caps. When I bought my defender it turns out the cap on it would pop at 4psi and then bleed down to 1psi. Its the same as the new one I bought but black instead of yellow. Don't know where to get them though or why they would have done it other than to hide the faults I found once my warranty ha run out.
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  4. 16th May 2006, 01:07 AM #14
    51jay Guest
    280,000 no problems yet


    bugger!!! I've probably just jinxed myself!! why do people ask these loaded questions??
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  5. 22nd May 2006, 06:34 PM #15
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    spudboy
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    Can anyone tell me how much the EMS black box costs?

    I know I could email the supplier, but I have had only 1 of 4 email enquiries answered by manufacturers in the last month or two. Much quicker here!

    Thanks.

    Also - what about the price on a Thermoguard? I emailed Ian earlier today but no reply as yet, so would be interested if anyone knows that.
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  6. 22nd May 2006, 06:51 PM #16
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    DEFENDERZOOK
    DEFENDERZOOK is offline OldBushie
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    hey guys......back to the tanks.....

    they are made of plastic....they get hot....they get cold.....
    again and again.....after a few years they will get brittle....its a characteristic of the plastic.....
    nothing is to blame other than age......and wear and tear.....
    if you are worried...replace it before it blows...and keep the old one for a spare.....

    all plastics will eventually crack.....even the washer bottles go this way....
    and they only have cold water in them......its the heat from the engine...
    or even just sitting out in the sun.....it will kill them eventually......
    Last edited by DEFENDERZOOK; 22nd May 2006 at 06:56 PM.
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