 | Home > Puma (Tdci) > Leaking from expansion tank cap? |
 
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| jpboost Member Since: 13 Apr 2021 Location: Gatwick Posts: 377   
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Mine was similar. Although mine had less obvious staining so it was less clear as to where the issue was.
I was trying to work out if the tank had a hairline crack, or the cap was faulty. I put a new cap on (the simplest option), and it's been perfect ever since. Less than a tenner iirc |
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15th Oct 2022 4:29pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3414  
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They also like to fail from the seam, where the upper half joins the lower half. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing
2012 90 CSW, 2.2TDCI, Santorini Black |
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15th Oct 2022 4:33pm |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3676 
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I’m pretty certain it’s not cracked and there is coolant right on the threads of the neck. There doesn’t appear to be any sort of seal in the cap, not sure if there should be. It’s just plastic on plastic.
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15th Oct 2022 5:04pm |
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| Birdy Member Since: 07 Oct 2011 Location: Côte d'Azur Posts: 865  
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They all do that, Sir...
Seriously, every time I look under the bonnet there's a trace of pink fluid around the tank cap. And yes, I HAVE replaced the cap, no difference at all and the original is in the tool-box "just in case". The coolant has never dropped enough to cause a problem, the biggest PIA is actually seeing the level in the tank. Do JLR deliberately make it out of non-see-through plastic? One day I'm gonna shake the thing so hard trying to get the fluid to slosh around and become visible, that I'm gonna rip the whole tank off its bracket! Peter |
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15th Oct 2022 6:25pm |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3676
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It’s dripping into the exhaust and doesn’t smell great when stationary!! Have ordered a new cap. If it still leaks I’ll wrap a bit of ptfe tape around the threads!
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15th Oct 2022 6:27pm |
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| Dinnu Member Since: 24 Dec 2019 Location: Lija Posts: 3414
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Keep in mind that the cap has a pressure relief and is designed to maintain a set pressure. Once that pressure is reached, it needs to vent. The pressure is just released over the tank.
My old 90, with the brass tank, has a pipe that routes the vent downwards of the tank itself. My daily is a Volkswagen. That has a spherical tank, with an inbuilt vent that vents beneath the tank, and a level sensor (flashes temp warning light on dash if level goes too low), and is a see through. But guess these good to have attributes for a coolant expansion tank are too complex for LandRover’s engineers. 1988 90 Hard Top, 19J Diesel Turbo, Shire Blue - Restoration ongoing 2012 90 CSW, 2.2TDCI, Santorini Black |
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15th Oct 2022 6:58pm |
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| LandRoverAnorak Member Since: 17 Jul 2011 Location: Surrey Posts: 11324
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You could fit a better quality Iveco cap:
 Click image to enlarge More details here: https://www.defender2.net/forum/post710243.html#710243 Darren 110 USW BUILD THREAD - EXPEDITION TRAILER - 200tdi 90 BUILD THREAD - SANKEY TRAILER - IG@landroveranorak "You came in that thing? You're braver than I thought!" - Princess Leia |
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15th Oct 2022 7:15pm |
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| neon1991 Member Since: 26 Mar 2018 Location: Colchester Posts: 75 
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I had precisely this issue that got steadily worse over time. Mine ended up being a very poorly cylinder head gasket. there was no smoke or anything sinister but now and then the cap would burp a load of coolant out. when I took it apart I found a crack that allowed air into the cooling. it was cheaper and quicker to source another 2.4 engine than mess about with it. it also managed to destroy an injector in the process
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17th Oct 2022 7:43am |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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Excellent cap  Fitted the same to Miffy. |
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17th Oct 2022 7:47am |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3676
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Well that cheered me up on a Monday morning!! |
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17th Oct 2022 12:00pm |
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| Leamreject Member Since: 19 Dec 2020 Location: Middle Earth - Leamington Spa Posts: 970  
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[quote="LandRoverAnorak"]You could fit a better quality Iveco cap:
Love it…. Iveco better quality than Land Rover.. have LR got it so wrong that Iveco are making better quality parts 
Don’t answer that we all know the reality, but it’s a shame when LR are being compared to Iveco for quality  Ride like you stole it!!
If I’m not on a bike it’s because only a 4x4 will do… 2011 2.4 Puma 90 HT |
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17th Oct 2022 12:08pm |
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