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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Not overheating but system is becoming pressurised
Hi All,

There are a few similar threads out there but none seem to site fit my scenario, so I thought I'd see if anyone has had a similar experience.

2008 110 2.4 TDCI
mapped
The truck went into limp mode and the temp shot up to the top. Stopped immediately and checked it out. Small blanking hose on water pump outlet had split so I thought happy days at least I have the reason. waited for it to cool down and refilled it.
this wasn't done correctly at the time due to time constraints and the truck misbehaved ..... no heating in cab. which I put down to an air lock.

Truck doesn't overheat, (needle sits at just past the half way mark)
Cooling system becomes pressurised (pipes get hard, bubbles (like fairy liquid) in expansion tank
No evidence of "mayo" in the oil cap
No noticeable loss of power
No white smoke


I've now:
drained the system completely,
fitted a new thermostat,
refilled and bled the system correctly however the above issues are still present..... any assistance would be much appreciated

I'm guessing this all points to the head gasket but hopeful it isn't lol. I'm waiting for a coolant test kit to arrive to check for exhaust gasses

Many thanks
Andy
Post #873344 16th Dec 2020 8:45pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8025

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
mine was pretty similar to this and it was the head. no symptoms other than pressurising. bubbles in expansion tank in your case point to head, if not where is the air coming from? Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #873346 16th Dec 2020 8:51pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Thanks for the quick reply.
Yeah I figure its the head but thought I'd just see if anyone had any other bright ideas before I embark on that expensive journey

Maybe time for an engine upgrade then Very Happy
Post #873348 16th Dec 2020 8:54pm
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Kevlar



Member Since: 28 Oct 2020
Location: Prague
Posts: 78

Czech Republic 2010 Defender 90 Puma 2.4 SW Santorini Black
The temp sensor in the dash never moves, my car over heated and blew out the filler bottle cap. The temp sensor was still in the middle.
I have a OBD Bluetooth dongle which displays live data on my phone, it’s the only way to really see the actual temp in real time.
Post #873500 17th Dec 2020 8:31pm
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jst



Member Since: 14 Jan 2008
Location: Taunton
Posts: 8025

 2011 Defender 110 Puma 2.4 USW Stornoway Grey
Just check ots not egr cooler failure Cheers

James
110 2012 XS Utility
130 2011 M57 bespoke Camper
90 2010 Hardtop
90 M57 1988 Hardtop
Post #873507 17th Dec 2020 8:56pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
I am wondering if it may be the EGR or oil cooler issue.
Today I drained the oil....no sign what so ever of water contamination.
I also removed the Oil cooler thermostat.....only to find the central section completely missing not sure why the previous owner would have done that!

I also noticed that the wiring to the EGR was not connected correctly (the previous owner had broken the plug and the plug was not locked in place.
Post #873650 18th Dec 2020 7:28pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Hi All,

Just thought I would post an update in case anyone is interested.

I stripped out the EGR valve and EGR cooler - No obvious leaking but it was pretty clogged up so all cleaned and put back on

I then stripped out the Oil cooler (housing away from the block) this was in a bad way. Hardly any water flowing through the cooler even with the hose on full pressure it just backed up and blew the hose off. (you can see the water ways are corroded) Also the seals between the water way and oil way look knackered.

New oil cooler on the way complete with gaskets.

Thats the Christmas lockdownwork list sorted Laughing

Have a good Christmas
Andy
Post #873827 20th Dec 2020 9:44am
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Kevlar



Member Since: 28 Oct 2020
Location: Prague
Posts: 78

Czech Republic 2010 Defender 90 Puma 2.4 SW Santorini Black
At least you found the cause and it’s way better than head gasket Thumbs Up
Post #873828 20th Dec 2020 10:11am
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Greyman110



Member Since: 29 Sep 2017
Location: London
Posts: 327

United Kingdom 
Thanks for updating your thread...This is very interesting!

I’ve been troubleshooting a similar issue and the oil cooler wasn’t on my radar.

Think I need to take a look at mine.

I don’t suppose you have any pictures of what the issue was with your oil cooler by any chance?
Post #873848 20th Dec 2020 1:25pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Hi Kevlar, I'l upload some pictures of the knackered oil cooler for your reference tomorrow Thumbs Up
Post #873917 20th Dec 2020 8:33pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Another quick update. Apologies for the delay in uploading the pictures.

Oil cooler definitely dead but not sure the pictures really show this, although you can see evidence of corrosion. you can't even blow through the coolant inlet pipe.

The new oil cooler arrived today so that will be tomorrow's little job.

Having put the EGR back on last week I just couldn't leave it not knowing 100% that it was not leaking. So yesterday I removed it again and pressure tested it using a plumbing pipe pressure test kit.....It works fine, no leaks! At least I know now for sure and should the oil cooler not be the cause of the original issue it only leaves the Head.
Post #875066 29th Dec 2020 5:25pm
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Greyman110



Member Since: 29 Sep 2017
Location: London
Posts: 327

United Kingdom 
Thanks for the update.

Will be interested to see if this fixes the issue.
Post #875088 29th Dec 2020 6:48pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
Another update...
Dead oil cooler replaced, new coolant installed and system bled. run the truck up to temp but still only getting intermittent heat in cab and still getting bubbles in the expansion tank!
Performed a Co2 test using RELD liquid. this has confirmed that there is exhaust gas getting into the coolant.

So,
Components changed:-
Thermostat
Oil cooler and housing

Components Checked:-
Water pump - spins freely when pulley is spun and will not spin if pulley is stopped
pressure tested the EGR
Heater valve - operation confirmed by opening and closing when a hose was connected to the inlet
Heater Matrix flushed both ways
Radiator flushed both ways

I am now only left with the cylinder head.
I'm guessing the gas getting into the coolant is causing air locks in the system which means every now and then I am not getting water going through the heater matrix and therefore no heat.....
tempted to use the "Steel seal" liquid just to see if that resolves the issue and by me some time to fund a new head. Does anyone have any experience of using this?

Andy
Post #875476 31st Dec 2020 4:39pm
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Greyman110



Member Since: 29 Sep 2017
Location: London
Posts: 327

United Kingdom 
Thats annoying!

I recently bought Steel Seal for mine but didn't end up using it. It was recommended by a garage who had used it a couple of times with success. The reason I didn't use it was mainly because my RELD test was coming back negative so not convinced it's my HG.

In my research of Steel Seal I found good and bad reviews. I think if I was sure it was my head gasket then I would probably give it a shot.
Post #875543 31st Dec 2020 8:34pm
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Gonewalkies



Member Since: 02 Sep 2019
Location: Isle of Wight
Posts: 8

United Kingdom 2008 Defender 110 Puma 2.4 SW Orkney Grey
So.... I put the "Steel Seal" magic liquid in according to the instructions.

After taking the truck for a few test drives with varying load conditions I re-tested the coolant using the RELD test kit.
Quite unexpectedly it returned a negative test result this time....The Steel Seal had worked! (for how long I don't know mind)

I'm still getting intermittent heat in the cab which I'm assuming is due to air in the system caused by running the truck prior to the Steel Seal being put in. So more bleeding tomorrow I guess

its been an interesting issue this one

Happy New Year!
Post #875684 1st Jan 2021 4:59pm
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