Gents,
I have a Disco V8 -99. A couple of weeks ago the car started overheating and had a good overpressure in the cooling system. I jumped into action and removed the cylinder heads, had the heads grinded and pressure tested. Fitted new gaskets etc etc. Started the car an hour ago and have the same problem as before. Not only am I a couple of hundred Euro lighter, I also spent a fair amount of hours under the hood, an I seem to be back at square one. As indicated above, I would really appreciate help.
Rgds
Peter

 

how many miles, and is it a D1 or D2? Flushed the cooling system? Checked or replaced the water pump?

 

Dont't know about miles but 90000 km. Cooling system pureis water after several refills. Water pump seemed ok, just fitted new gasket.
///P

 

Maybe you have a cracked cylinder liner. That would get extra pressure in to the cooling system. Does it leak out coolant?

 

Cracked cylinder liner, that is what I fear the most. Is there any way of telling?
///P

 

Have you done a compression test or a leak down test? This would tell you a lot about the condition of the bottom end.

Piotr

 

Hi all,
Did a compression test this morning. 10 bar except for no 1 (11bar) and no 7 (9bar). Does not worry me to much, how about all of you?
Rgds
Peter

 

Go thru and pull one spark plug at a time till you find a wet one.
Chances are good that you let it get too hot and dropped a sleeve.
Any coolant in the oil?
Mike

 

Mike,
No wet plugs, no coolant in the oil.
///Peter

 

I just read through again, and this is just a thought.... any way you could have blocked a port while fitting the new gasket on the water pump? I was just wondering how quickly it overheated. If it is immediately upon warming up, you might have a coolant flow problem. Might also just pull the T-stat for the heck of it. I had a friend that bought a T-bird. Someone had used that copper radiator sealant on it. His wife was driving it, and somehow a chunk of that stuff got on top of the stat and wouldn't allow it to open. Blew the motor.

I am not sure what you have checked so far, so excuse me if it seems redundant.[&:] Just my thinking.

Good luck!