I understand everyone's effort on dismounting the compressor from the bracket, but I find a lot easier to remove a compressor still attached to a aluminum bracket.You take the bracket out , then , you can remove a compressor out from the bracket clean the mountings, attach a new one and mount the bracket back to the chassis with the compressor already attached to the it.No need to struggle with a top plastic , sound deadening cover, nor awkward position if the top allan key bolt.Actually , in my case the top allen key turned out to be a star key( the new ones are all allen, whereas the old one were two 4 mm allen and one star.)
Yesterday i successfully renew a compressor with a overhaul kit (repair kit with bunch of springs and O -rings and few screws, provided by LR dealerPN JPO 500010).I also had a new dryer laying around for the past 6 months, so i changed that two.Now, regarding the air lines, some members reported them being melted, my were seized , especially intake and exhaust pipe connectors( two black ones on the side of the compressor). I sprayed them e few times with a penetrating oil , waited about a 20 minutes, total and they released with no problem .Dryer blue connector was OK and disengaged fine with just a little PUFF of air, no need to connect any computers to de pressurize the system at all.Compressor has a separate valve block , so when you remove the pipes , it does not release air from the entire system, not even the air tank, that why you hear only small puff , oposse to big hiss.
Taking the aluminum bracket off the chasis is a little hard, when it comes to top bolt, but at least is visible, with a flashlight,and you need 10 mm ratchet with a with swivable head and a little patience and no need to wrestle with a upper compressor cover.
When i tried to remove the compressor from the bracket itself( at the comfort of my house) ,. the long , star key screw snapped, although it was sprayed with a penetrating oil also.I said to myself , no biggy , i will re drill it and fabricate a different screw, but broke a few drill bits and and went sideways making the hole off center, bigger and protruding a screw base , making me miserable and bracket un usable, at least for me.Besides , bracket , alone was in pretty bad shape, it looked like it lost weight, oxidized too much. I Called dealer, regarding a bracket and they only one in stack, luckily i had a 20% off coupon., so it was't that bad.It is also a good idea to change a captive clips, that hold bracket screws to the chassis. they don,t have to be original , from dealer, you can pick them up from any hardware store, as they just M8 x1.25 clips and you need three of them . My were pretty corroded , so I figured , since i have a new bracket i might as well get a new clips.On the side note , bracket does not come with any screws, but my did somehow. i was told , to the surprise of a parts guy, that bracket must have been a special order and never picket up and one of the mechanics must have attached this particular screw, that i desperately need anyway, since it looked odd , anyway.
Overall with a little delay(bracket) I re attached compressor to the new holder and off I went with installing everything back to the chassis.You have just enough room to catch first thread with a top bolt, third hand helps , with a kipping the bracket with a compressor UP in place, as it is heavy.
After that everything else is just reverse order , fire up the car a, check for leaks and enjoy.