Knuckledraggers,
The bit you missed was the temperature. The oil system on the 109E and S is "unregulated". The correct pressure is computed from N1 speed AND oil temperature.
Look at the difference in temps. The higher temp and SAME pressure is acceptable on No.2 but not No.1. The EDU re-scales the pressure range accordingly to the oil temp AND N1.
You can adjust the pressure. See the manual and your trusty engineer. You need to set the N1 at a fixed value (selecting manual and beep the RPM on the ground) and you should have a certain oil pressure versus oil temp.
The pressure on No.1 is too low for the oil temperature and N1.
Buy lots of beverage for your engineer as the oil pressure adjustment is on the bottom of the gearbox. Like many things on this installation you can probably see it but thats about all you can do. There is a fancy tool required to make it easier to adjust.
Be aware also that you may be chasing something else. S and E models are known to have issues with the thermo valves in the coolers. Your temps seem to have a larger than normal split.
Don't expect P's and T's to ever match very often on a 109.
Sounds like you need a 109 engineer, what are you paying?
Last edited by RVDT; 2nd Apr 2009 at 14:30.