I suffered a valley hose failure for the third time on my 08 XKR. After tearing it down, this is what I discovered.

For those of you familiar with the hose (condolences), this is exactly how I found it.
On my last install I never moved the hose clamp up! Total bonehead move. It's been many a long year since I pulled a stunt like this.
The remarkable part is that I drove it like that for well over a year and a half before it overcame the friction fit and blew off.
In all that time I was experiencing a very minor coolant loss that I attributed to the auxiliary pump inlet hose. Perhaps I was wrong on that too.
Anyhow, feel free to abuse me. 😖

 

My man...we've all been there (whether we admit it on social media or not!)

Now, who among us hasn't lost a few 10mm sockets?

 

Don't beat yourself up too much.
Yesterday, I removed the throttle body from my 1997 XK8 for the first time ever, not because there is anything wrong with the throttle body itself but because I need to remove the inlet manifold to replace the valley hoses and the thermostat tower. Anyway, after removing the throttle body I flipped it over to give it a good clean and found that this was how the coolant hose had been clipped to the spigot at the Jaguar factory.
Obviously not a great day at Browns Lane.

 

But at the end of the day... that hose and connection have lasted 28 years??

 

Yes, that's undeniably true. I've never seen a hose clip half-mounted on the spigot but, as you say, it has survived the test of time and 80k miles.

Richard