Its not a bad job to do... Obviously the intercooler pipes need removing then if you remove the small manifold metal joining pipe off the manifold with the two 13mm bolts theres enough clearence to take the cover off but only just enough!!
You may need a smear of sealent when you put the metal pipe back on.. Also it may well be worth sourcing a new breather pipe to put back on chances are likely its gone brittle with the engine heat and it will split when removing or replacing which will then give you ab oil leak down the ebgine....
Just tighten the bolts sensibly but bear in mind they need to be tight enough so they dont rattle loose with engine vibration.. No doubt in the bol theres a tourque setting.
Paul
Sharing a pug 207 1.6 hdi Sw 16v.
M reg Xm 2.1 td auto exclusive S2 269k and rising
L reg XM V6 12v SEi auto .. Light project
My BoL gives the torque for the "cylinder head cover", which is what you are referring to, as 15 lbs ft. A bit low for some torque wrenches, and how accurate are they? I'd rather torque it down gently by hand - if it still leaks, you can then tweak it up a little.
I assume you're replacing the rubber seal as it's gone hard with age - I've had to do this on my TD.
As Paul says, you may find the engine breather pipe has also hardened. I've had to replace mine, as it had split under the jubilee clip connecting it to the cover, which obviously gets quite hot.