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| Radiator cap pressure https://www.ausmini.com/forums/viewtopic.php?f=2&t=98289 |
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| Author: | AWOODY [ Thu Feb 21, 2019 7:27 pm ] |
| Post subject: | Radiator cap pressure |
When removing the radiator cap after not driving the car for 2 weeks it is like opening a can of coke it is still holding pressure, stuffed cap ? Suggestions ? |
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| Author: | Morbo28 [ Thu Feb 21, 2019 7:38 pm ] |
| Post subject: | Re: Radiator cap pressure |
Is it definitely high pressure escaping when you open it or possibly low pressure drawing air in? If you have an overflow with a return-type cap, it could be that the heat is forcing the water out, but when it cools the water is not allowed to be drawn back in again, creating the relative vacuum. From maybe an incorrect cap or a knackered cap? I just wouldn't expect it to be HIGH pressure, as even if it got hot and created high pressure, cooling would return pressure to normal. If the high pressure let water out when hot, you'd actually expect it to be in relative vacuum when it cool if if doesn't have a coolant overflow/return reservoir and cap. But that's just my initial thoughts, let's see what others think. Either way, I'd replace the cap and see how it goes. They're pretty cheap. |
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| Author: | winabbey [ Thu Feb 21, 2019 8:24 pm ] |
| Post subject: | Re: Radiator cap pressure |
If you do replace it make sure you get one of the correct length. I once drove a Mini for the first time and wondered why it was overheating badly. Turns out it had just been fitted with a short neck cap instead of long so the sealing rubber ring on the cap didn't reach to the mating surface in the radiator neck. Hot water was simply gurgling out the overflow tube. 
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| Author: | Hinesy1275 [ Fri Feb 22, 2019 7:12 am ] |
| Post subject: | Re: Radiator cap pressure |
If renewing, measure the depth to the sealing lip that the cap sits against. Tridon spec sheets recommend CN1390 which in my experience is too shallow and incorrect length @ 31mm. I use Tridon CR1390 @ 34.5mm depth. [1390 = 13Psi/90kPa] CA1390 is also too shallow; CB & CC are small connection bayonet type. F |
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| Author: | AWOODY [ Fri Feb 22, 2019 3:40 pm ] |
| Post subject: | Re: Radiator cap pressure |
No overflow and definitely pressure out it is a 50 mm alloy radiator. |
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| Author: | Morbo28 [ Fri Feb 22, 2019 3:43 pm ] |
| Post subject: | Re: Radiator cap pressure |
Not something weird like head gasket leaking combustion pressure in the coolant passageway? That's probably a stretch... Sent from my Pixel 2 XL using Tapatalk |
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| Author: | AWOODY [ Sat Feb 23, 2019 4:25 pm ] |
| Post subject: | Re: Radiator cap pressure |
I would like to think not , pump , radiator, head gasket , hoses etc all replaced about a year ago. |
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| Author: | danny_ [ Sun Apr 07, 2019 10:18 am ] |
| Post subject: | Re: Radiator cap pressure |
I am having the same issue with my 50mm radiator, It does not suck the water back in when its cool and the radiator it self still holds pressure. I purchased a new cap and hoping it will fix it all. |
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| Author: | timmy201 [ Sun Apr 07, 2019 11:22 am ] |
| Post subject: | Re: Radiator cap pressure |
danny_ wrote: I am having the same issue with my 50mm radiator, It does not suck the water back in when its cool and the radiator it self still holds pressure. I purchased a new cap and hoping it will fix it all. Have you got a regular cap or a "recovery type" cap? The regular caps will push out coolant and it air takes it's place. The recovery ones will allow coolant from the reservoir to be sucked back in |
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| Author: | danny_ [ Sun Apr 07, 2019 3:54 pm ] |
| Post subject: | Re: Radiator cap pressure |
timmy201 wrote: danny_ wrote: I am having the same issue with my 50mm radiator, It does not suck the water back in when its cool and the radiator it self still holds pressure. I purchased a new cap and hoping it will fix it all. Have you got a regular cap or a "recovery type" cap? The regular caps will push out coolant and it air takes it's place. The recovery ones will allow coolant from the reservoir to be sucked back in Recovery, Has the 2 seals. Maybe its an excuse for me to do an engine rebuild. |
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