I am a newbie and am attempting to replace the thermostat housing on my 2005 XK8. I have read many threads concerning the issues, but am wondering if there are any required torques when I reinstall, didn't see any references. Any help will be appreciated.

 

First of all, welcome to the forum.

You should download JTIS, which is step-by-step instructions for most procedures on your car, complete with torque values. You can get access to JTIS in the DIY sticky at the top of the forum listings.

In the meantime, JTIS says the correct torque for bolting the thermostat housing to the engine block is 9 Nm...just a bit more than finger tight.



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The back bolts can be hard to get to. Make sure in reading the threads you either make or buy the tools needed for the job.

 

If you replace the back screws with socket heads and buy a ball head set it is a lot easier.

 

. . . and breaking the plastic housing off, bite at a time, with a pair of pliers makes access to the rear bolts easy. You are going to throw it away anyway.