I continued my top end refresh by replacing the oil pressure sender. Mine was faulty, just with the ignition on climbed to 2 bar and was slowly creeping upwards. With engine running it was permanently stuck at the top end of the scale.
I knew it is a bit of pain to replace. I removed all the connectors and brackets around to make some space but I was not able to loosen it or get any wrench on it. I even tried to grip it with pliers and I managed to turn it indeed, but only the top part. The bottom parts was firmly stuck.
Its design is also truly excellent, because crank position sensor is right under it. You cannot remove the crank sensor with pressure sensor in place as it is impossible to slide up. And the wire from the crank sensor obstructs the access to the 24mm hex at the bottom of the pressure sensor. There is very good chance to damage the crank sensor wiring when trying to grip the pressure sensor.
In the end I gave up. The only way I see to remove it is using a crowfoot wrench that I don't have, so same as with the engine mounts I had to drive to a friend with welding machine and make one from a 24mm spanner and 1/2" extension.
Probably the only suitable big enough 24mm tool that can fit in and get it out.
And here is the "excellent" design of the crank sensor and oil sensor holes side by side and angled towards each other on a collision course. I am sure it was impossible for the engineers to move them 1cm apart.... Or to make a small extension for the oil sensor to sit few millimeters higher, this would allow to remove the crank sensor and get to its hex easier....
After a small victory and being excited that I got the old sensor out, I put the new one in, attached the wiring, tightened the tiny nut that holds it and messed up badly and snapped it...... Totally stupid me!!!!!! Full of excitement about the progress, with big hands and small brain I snapped the pin on the sensor that attached the wire. Great..... I ordered a new one from Germany, and all progress stopped until I get it. Money and time wasted due to my stupidity.
In the meantime while being stuck I refurbed the fuel rails and injectors as I had them out anyway.
The seals on the injectors were old and hard and I had some blow by through them. Here is one dirty one, with both seals removed. I really recommend cutting the old seal in half and removing that way as it is close to impossible to stretch the old rubber over that fine plastic protector plate by the nozzle without damaging it. I did break some in the past...
New injector seals are available from Maserati/Ferrari as part nr 133902 for 6-7€/piece what is pretty crazy for rubber O-rings once you realize you need 16 of them. Luckily, Bosch sells them under the number 1 280 210 711 and I found them locally for 0,70€/piece. So at this price I bought 32 of them to have some spare ones at home
And here are the rails with cleaned injectors with new seals.