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Discussion Starter · #1 ·
Noticed this morning that I has creamy looking water in the top of my expansion tank, looked inside and oil/water in top of tank.

No over heating or anything like that.

Just what I need rite now 馃槬馃槬馃槬馃槱馃槱馃槱
 

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Not ideal! i've never really come across many threads of the 3.0 suffering headgasket issues. If you have caught it early enough then it should just be a straight forward repair as far as head gaskets go anyway.
 

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If the engine hasn't overheated, and if you don't run it until the issue is investigated, then it should be a relatively simple head gasket replacement job, with maybe a need to skim the head mating surfaces flat before re-assembly
 

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Discussion Starter · #4 ·
The day started with me looking why I had the engine management light on with fault code P0098-0 {intake temperature sensor 2 circuit high input}

I open the bonnet to see if their was anything obvious I could possibly repair myself.

This is what I found whilst looking for the sensor/fault code issue, I have no idea how 2 wires would just snap but it does look like they have had past repairs or possibly rewired because the cover on the 2 wires does not look original Jag.

Motor vehicle Automotive tire Hood Automotive fuel system Rim


Would this sensor cause the issue that has put oil in my coolant res? what does this sensor do, apart from the engine management light issue I have had no overheating, high temps or nothing, it got parked up as soon as the EML came on and has not moved for days.

Automotive tire Motor vehicle Bumper Automotive fuel system Automotive exterior

Any help or suggestions would be much appreciated.
 

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I don't think there is any way a deficient sensor or its connections can put oil into the coolant. All it will do is trigger one of more codes and, maybe, put on an engine management light on the dash, and of course normal engine running may be affected.
It is indeed an odd defect and could only really have happened if someone in the past had caught the loop of wiring loom accidentally and jerked it hard enough to snap the wires. Then if a repair had been made by just twisting the wires together and sticky taping up the joint, it could well fall apart again after being subjected to engine heat.
The only way to repair this properly (short of a whole new wiring loom) will be to solder the wires back together (matching wire colours of course) and then re-insulate them with something like heat-shrink tubing or maybe self-amalgamating tape.

Regarding the oil in coolant, and just to eliminate any sort of "chance happening", you could siphon the oil & coolant out of the header tank and refill it with fresh coolant. Then run the engine for a while and see if the oil re-occurs. However, I realise this goes against my previous advice not to run the engine again until its checked out. The other option is to get a garage to run a pressure test on the coolant system - if there's a head gasket leak this should show up as a slow loss of pressure.
 
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Discussion Starter · #6 ·
I started to look into it today, I have taken the res tank off and the only thing that came out of the pipes connected to it was redish coolant/water, with no signs of any oil/contaminate in the coolant from the pipes, I have not topped the reservoir back up and run it because I am in the the process of cleaning it out or possibly buying a new one.
 

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I'm not familiar with that engine, but does it have an oil-water heat exchanger for an oil cooler or transmission cooler?

Maybe, just maybe...
 

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Discussion Starter · #8 ·
I'm not familiar with that engine, but does it have an oil-water heat exchanger for an oil cooler or transmission cooler?

Maybe, just maybe...
That's a good point, as already pointed out, it's not an engine that suffers head gasket issues, I don't know what or how things get cooled on these engine's :unsure::unsure:
 

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Ah yes, I'd forgotten about these heat exchangers.
There will definitely be pipes carrying transmission fluid that go through the main radiator at or near its base, and it's not unknown for these to leak transmission fluid into the coolant. Any trace of red fluid/oil (assuming the transmission fluid is coloured red which it normally is) within the coolant would indicate that this is the source of the oil. If this is the source the cure would be the relatively simple job of replacing the radiator.
I don't know for sure with this engine but it does seem likely that it will also have an engine oil - coolant heat exchanger and this could be the source of the oil.
I'm not sure how you can test for either of these, though. Perhaps someone else on this forum will be able to offer some advice on that.
 

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my first thoughts is a faulty engine mount that has caused that to snap like that, to repair that wire will be relatively simple, on topix there is a pin code attached to each connector and it would just be a case of depinning the plug and replacing the wires and joining it onto the rest of the loom, if you want i can take a look on topix later but i would need the last 8 digits of your vin or you could just pop into your local branch for the pin numbers, they will most likely keep them in stock as they wont just be for that connector
 

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There are some good diagrams of the workings of the V6 engine in the technical section.
Second link on the first post .
(Ignore the link title as it has both the diesel and V6 PDF's)
PDF of Ingenium Diesel
 

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Discussion Starter · #12 ·
Thank you all for the help and suggestions, I've had the car dropped off at my local jaguar specialist and I'm waiting for them to investigate the issue, I will update this as soon as I have any more info.
 

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McK,
Hoping your local Jaguar guy finds the root cause for a permanent reasonable cost fix. One more thing about oil in the coolant Left unchecked, it can sometimes create a precipitate sludgy material in the cooling system. If this clogs your heater core (like it did in my wife's then new Nissan POS Xterra over two decades ago), it can be a much bigger costly job to rip apart the entire dash/firewall to replace the actual heat core which usually can't be blown out to unclog.
 

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Discussion Starter · #14 ·
McK,
Hoping your local Jaguar guy finds the root cause for a permanent reasonable cost fix. One more thing about oil in the coolant Left unchecked, it can sometimes create a precipitate sludgy material in the cooling system. If this clogs your heater core (like it did in my wife's then new Nissan POS Xterra over two decades ago), it can be a much bigger costly job to rip apart the entire dash/firewall to replace the actual heat core which usually can't be blown out to unclog.
Thanks for the heads up, I had the reservoir off and cleaned it all out before it disappeared and I have a new reservoir on route for them.
The few pipes that do connect to the reservoir had no gunk flowing out of them so hopefully it's not filled the system with gunk yet.
They advised it will need 2,3 or 4 flushes once they find the cause and repair.
I think I will need to remortgage the house when I get this invoice/bill :cry::cry::cry::cry:
 
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