I have just changed the oil cooler on my 2004 147 GTA so have attached some photos and basics of what is involved as I haven't seen any other threads for the newer type of oil cooler with the pear shaped oil pipe fitting which are held in with an allen key bolt. I had seen threads on the 3.0 type coller which has nuts on the cooler & don't come off!
I priced the parts for the 147 GTA from Alfa which came to a cool £433 inc Vat for 2 pipes & a cooler & apparently 1 of the pipes is now obsolete.
I got a brand new oil cooler from Jason through Autolusso for £176, much less painful on the wallet!!
This thread will only apply to you if your oil cooler is leaking & your oil pipes are in still in decent condition, if your pipes are rusty I would recommend putting it into an alfa specialist as the two 22mm bolts at the oil filter are in-accesable with a socket & look a nightmare to get at without taking the drivers side drive shaft off!! I was quoted £168+ vat just for labour to fit new pipes & cooler - I can see why!!
Basic procedure, there are probably much quicker ways but I got there in 3-4 hours with the luxury of a pit & pit jack!!!!
Jack up & support the car remove the front driver side wheel
Unscrew & fold back the carpet wheel arch liner to see the oil cooler behind the bumper
Unscrew the 2x 5mm allen key bolts which hold the pipes to the cooler(make sure to clean inside the screw heads first so that the allen key gets right in) I had to put an extension pipe on the allen key to get them to slacken.
Unscrew the 10mm nut on the top of the cooler, repeat this for the one nearest the engine which is blind you will have to feel your way up the side of the engine to get it(I had the pleasure of this one spinning the whole bolt) I put duct tape onto my crow bar to prevent paint damage & wedged the cooler down which then seemed to lock the stud enough to get the nut off.
Take off the bottom bolt, in my case with a hacksaw as it was rusted solid inside the plastic nut/cilp.(don't worry as you can put in new 10mm bolt through with big washers to hold the new cooler)
Oil Cooler can now be taken out of the wheel arch & sat on the ground to now try & remove the pipes, soak pipe fittings with WD40.
I tapped around the aluminium pipe housings & edge of the metal pipe flanges & eventually I got movement, gentle twisting & levering with a screw driver & the hose fittings came out nice & shiny with o-rings intact & about a litre of Selenia oil!!
For ref the depth of the nose of the pipe fitting to the flange is 14mm deep.
Refitting is reversal of remova, just grease the pipe fittings before reasembling - only lightly grease the allen bolt threads as too much grease could crack the aluminium bolt hole in the cooler when you screw the bolt in.
Also thouroughly coat the metal parts of the oil hoses with underseal or copper grease to stop them rusting & your wallet bleeding!!
Make sure you check the oil level before you start the car.
Start up & check for leaks, switch off & re-check the oil level.
Take the car for a run checking the oil temp & make sure it hits 100deg c then re-check your oil level again in the morning.