Radiator caps

I think it could have been your cap that caused it to overheat. If a cooling system can't hold pressure it'll allow the engine to overheat.

For the record mine says 140 too.

My old and new ones both say 140.

PeterH, I had the same issue as you with a missing oring on the overflow cap!

Off the old or new one?

I had issues with my Radiator Cap not sealing correctly... Vehicle was overheating on Warm Days...

I replaced the Expansion Tank & Cap (Came as a Complete Set) about 3 weeks ago... Had Melbourne's 9 Days of 30+ including a Trip to Yarrawonga (40 Degrees) no issues...

Purchased from Ebay for $100 Shipped....
Land Rover Radiator Expansion Tank Reservoir Cap Discovery 2 II Range P38 Allm | eBay

I have recently had overheating issues with my D2a V8.
I have replaced the bottom hoses because the heater outlet was broken on that plastic 3 way gizmo and I thought that that was the end of it.
It is still overheating so I checked the thermostat and that is just fine (2 yeas old) but I did notice that my expansion tank cap had some damage to it and the top "O" ring wouldn't be seating properly.
I will head into town tomorrow to pick up a new cap and hopefully this will resolve the overheating issue [bighmmm]

Here is the damaged cap.
Attachment 129860Attachment 129861

I only use genuine radiator caps becuase I have had all sort of pressure problems with after market ones!

Steve