As far as I can tell, it isn't physically possible to replace the servo without taking the ALDA off -- it only takes a few minutes and keeps you from sweating and swearing for hours....

Keep a 14mm wrench in you hand when you start up again -- leave the hood open. This will give you time to get to the injection lines it if runs away. Turn each open a half turn or so until the engine stops if it does, this will save the engine.

It is very, very unlikely anything will happen, but be prepared!

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!