L322 Oil in coolant LR322, 3.6V8TD

Hello, i have a 2008 LR322 with a 3.6V8 diesel. I have a grayish substance floating in the coolant reservoir. No history of overheating. No starting problem. Is it most likely the gearbox oil cooler? Or should i be looking at something else, maybe de diesel cooler. There is no coolant in the gearbox or engine oil. Hope some one can shed some light on this

Any air bubbles in the coolant tank when the engine is running and warmed up properly?
Try fishing some of the goo out to take a closer look and or get a second opinion maybe before shelling out on your pennies!

No bubbles. I am willing to spend money on the problem not throw money at it. That is why i am reaching out

I'd be tempted to clean the reservoir out, refill and monitor it for a few drives and see if there is any more present.

I replaced the oil cooler with oil filter assembly and carter ventilation. Problem not resolved. Is there anywhere else where oil can get into the cooling system except for the cilinder heads. The strange thing is that there is not a drop of coolant in the engine oil. Any one delt with this problem before? Is there a service manual available for this engine?

ptrustfull said:

I replaced the oil cooler with oil filter assembly and carter ventilation. Problem not resolved. Is there anywhere else where oil can get into the cooling system except for the cilinder heads. The strange thing is that there is not a drop of coolant in the engine oil. Any one delt with this problem before? Is there a service manual available for this engine?

Click to expand...

No coolant in the oil because the combustion pressures are greater than the coolant pressures and the leak only happens when the engine is HOT?

DanClarke said:

No coolant in the oil because the combustion pressures are greater than the coolant pressures and the leak only happens when the engine is HOT?

Click to expand...

DanClark if you say combustion pressure is higher tham coolant pressure you are also saying that i have a head gasket problem or worst case a crack in my cilinder head

If that was the case, you would see a difference in the temp gauge behaviour because the gasses are also hotter than the coolant temp and you say it doesn't over heat?
Sniff test might be a good idea to rule out any gasses in the coolant.
I've seen cars with rotting rubber pipes before that leave crap in the reservoir.
Did you flush the system with a cleaner, rinse and refill. It could also be residue from a previous repair.

You may need to do a compression test to fully disregard head gasket issues, unless other diagnosis finds the problem first. It's not unusual for a failing head gasket to let water out and not coolant in. As the engine warms, things expand and as another member suggests, engine pressure is greater, pushing oil out. Early stages of gasket failure may not exhibit any other symptoms. Cracked cylinder head/block certainly would and highly unlikely to happen without some serious abuse.

You can purchase inexpensive CO2 testing kits which you could also try to rule out HG.

Does that engine have water cooled turbo's?

EGR coolers can leak. Which cause coolant loss and white smoke.

Head gaskets in the TDV8 aren't unheard of.

Best buy the Jag V8 they don't get these issues

Henry_b said:

Head gaskets in the TDV8 aren't unheard of

Best buy the Jag V8 they don't get these issues

Click to expand...

Head gaskets going in the AJV8's aren't unheard of either

robhew86 said:

Head gaskets going in the AJV8's aren't unheard of either

Click to expand...

Nah
the AJV8 post 2001 rectified all issues in the 4.2 + guise.

And TBF TDV8 head gaskets are a pain in the hoop to replace.

And they do blow

- Cleaned reservoir several times very good.
- If it was the EGR cooling leaking, it would not bring oil into the coolant i think.
- I do see oil pipes going to the turbo, no coolant pipes
After all the thoughts i noticed that when i drive easy there is not much sludge in the reservoir. When i step on it it fills up quickly. I will do the CO2 test. Anyone, an service manual will help me when replacing the headgasket